NCT7802Y [NUVOTEM TALEMA]
Hardware Monitoring IC NCT7802Y with PECI 3.0 interface;
| 型号： | NCT7802Y |
| 厂家： | 
NUVOTEM TALEMA |
| 描述： | Hardware Monitoring IC NCT7802Y with PECI 3.0 interface 监控 |
| 文件： | 总87页 (文件大小：1606K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Nuvoton
Hardware Monitoring IC
NCT7802Y
with PECI 3.0 interface
Date: Feb/2012 Revision: 1.2
NCT7802Y
Table of Content-
1.
2.
GENERAL DESCRIPTION ......................................................................................................... 1
FEATURES ................................................................................................................................. 1
2.1
2.2
2.3
2.4
2.5
Temperature Measurement ............................................................................................ 1
Voltage Measurement..................................................................................................... 1
Fan Control ..................................................................................................................... 1
Event Notification............................................................................................................ 1
General ........................................................................................................................... 2
3.
4.
5.
KEY SPECIFICATIONS.............................................................................................................. 2
PIN CONFIGURATION............................................................................................................... 3
PIN DESCRIPTION..................................................................................................................... 3
5.1
5.2
PIN TYPE DISCRIPTION ............................................................................................... 3
PIN DISCRIPTION.......................................................................................................... 4
6.
DESCRIPTION............................................................................................................................ 6
6.1
6.2
GENERAL DESCRIPTION............................................................................................. 6
ACCESS INTERFACE.................................................................................................... 6
6.2.1 Data write to the internal register......................................................................................6
6.2.2 Data read from the internal register..................................................................................6
6.3
6.4
ADDRESS SETTING...................................................................................................... 7
TEMPERATURE MONITOR DATA FORMAT................................................................ 7
6.4.1 The local temperature (on-die) data with 8-bit 2`s complement format.............................7
6.4.2 The remote temperature data with 11-bit 2‟s complement format.....................................8
6.5
6.6
6.7
6.8
VOLTAGE SENSE DATA FORMAT............................................................................... 8
FAN_IN Count Calculation.............................................................................................. 8
FAN_OUT Duty Cycle / DC Level Calculation................................................................ 9
SMART FANTM IV Control Parameters........................................................................... 9
6.8.1 Step Up Time / Step Down Time ......................................................................................9
6.8.2 Fan Output Start-up Value................................................................................................9
6.8.3 Fan Output Nonstop .........................................................................................................9
6.8.4 Fan Output Stop Time ......................................................................................................9
6.9
SMART FANTM IV ......................................................................................................... 10
6.10 PECI.............................................................................................................................. 11
6.11 ALERT# Output............................................................................................................. 13
6.11.1 ALERT# Output Mechanism.........................................................................................13
6.11.2 ALERT# Response Address.........................................................................................14
6.12 T_CRIT# Output............................................................................................................ 14
6.13 SMI# Output.................................................................................................................. 14
6.13.1 Temperature.................................................................................................................14
6.13.2 Voltage .........................................................................................................................16
Feb, 2012
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Version: 1.2
NCT7802Y
6.13.3 Fan ...............................................................................................................................16
6.14 RESET# Output ............................................................................................................ 16
6.15 Programming from EEPROM ....................................................................................... 16
REGISTER DESCRIPTION ...................................................................................................... 17
7.
7.1
7.2
BANK0 REGISTER MAP.............................................................................................. 17
BANK 0 REGISTER DETAIL........................................................................................ 22
7.2.1 Bank Select Register......................................................................................................22
7.2.2 Remote Diode 1 Temperature Readout Register (MSB) ................................................22
7.2.3 Remote Diode 2 Temperature Readout Register (MSB) ................................................22
7.2.4 Remote Diode 3 Temperature Readout Register (MSB) ................................................22
7.2.5 Local Diode Temperature Readout Register (MSB) .......................................................23
7.2.6 Temperature Readout Register (LSB)............................................................................23
7.2.7 PECI 0 Temperature Readout Register (MSB)...............................................................23
7.2.8 PECI 1 Temperature Readout Register (MSB)...............................................................23
7.2.9 Read PECI Temperature Readout Register (LSB) .........................................................24
7.2.10 VCC Readout Register (MSB)......................................................................................24
7.2.11 VCore Readout Register (MSB) ...................................................................................24
7.2.12 VSEN1 Readout Register (MSB)..................................................................................24
7.2.13 VSEN2 Readout Register (MSB)..................................................................................25
7.2.14 VSEN3 Readout Register (MSB)..................................................................................25
7.2.15 Voltage Readout Register (LSB) ..................................................................................25
7.2.16 Fan Count 1 Readout Register (MSB)..........................................................................25
7.2.17 Fan Count 2 Readout Register (MSB)..........................................................................26
7.2.18 Fan Count 3 Readout Register (MSB)..........................................................................26
7.2.19 Fan Count Readout Register (LSB)..............................................................................26
7.2.20 MNTIMON Percent Register.........................................................................................26
7.2.21 Diode Fault Alert Status Register .................................................................................27
7.2.22 Temperature Low Alert Status Register........................................................................27
7.2.23 Temperature High Alert Status Register.......................................................................27
7.2.24 Fan Alert Status Register .............................................................................................28
7.2.25 T_CRIT# Alert Status Register.....................................................................................28
7.2.26 GPIO Alert Status Register...........................................................................................28
7.2.27 Temperature SMI Status Register ................................................................................29
7.2.28 Voltage SMI Status Register.........................................................................................29
7.2.29 Fan SMI Status Register ..............................................................................................29
7.2.30 T_CRIT# Real Time Status Register ............................................................................30
7.2.31 Start Register................................................................................................................30
7.2.32 Mode Selection Register ..............................................................................................30
7.2.33 PECI Enable Register...................................................................................................30
7.2.34 Fan Enable Register.....................................................................................................31
7.2.35 Voltage Monitor Enable Register..................................................................................31
7.2.36 Conversion Rate Register ............................................................................................31
7.2.37 Fault Queue Register ...................................................................................................31
Feb, 2012
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Version: 1.2
NCT7802Y
7.2.38 Alert# High Limit Link to T_CRIT# Register..................................................................32
7.2.39 Reset Time Setting Register.........................................................................................32
7.2.40 Reset Limit Low Byte Register......................................................................................32
7.2.41 Reset Limit High Byte Register.....................................................................................32
7.2.42 SMI# Control Register ..................................................................................................33
7.2.43 RTD1 Temperature High Limit Register .......................................................................33
7.2.44 RTD1 Temperature Low Limit Register ........................................................................33
7.2.45 RTD2 Temperature High Limit Register .......................................................................34
7.2.46 RTD2 Temperature Low Limit Register ........................................................................34
7.2.47 RTD3 Temperature High Limit Register .......................................................................34
7.2.48 RTD3 Temperature Low Limit Register ........................................................................34
7.2.49 LTD Temperature High Limit Register..........................................................................34
7.2.50 LTD Temperature Low Limit Register...........................................................................35
7.2.51 DTS Temperature High Limit Register..........................................................................35
7.2.52 DTS Temperature Low Limit Register ..........................................................................35
7.2.53 RTD1 TCRIT Threshold Register .................................................................................35
7.2.54 RTD2 TCRIT Threshold Register .................................................................................35
7.2.55 RTD3 TCRIT Threshold Register .................................................................................36
7.2.56 LTD TCRIT Threshold Register....................................................................................36
7.2.57 DTS TCRIT Threshold Register....................................................................................36
7.2.58 VSEN1 High Limit Low Byte Register...........................................................................36
7.2.59 VSEN1 Low Limit Low Byte Register............................................................................36
7.2.60 VSEN2 High Limit Low Byte Register...........................................................................37
7.2.61 VSEN2 Low Limit Low Byte Register............................................................................37
7.2.62 VSEN3 High Limit Low Byte Register...........................................................................37
7.2.63 VSEN3 Low Limit Low Byte Register............................................................................37
7.2.64 VCC High Limit Low Byte Register...............................................................................37
7.2.65 VCC Low Limit Low Byte Register................................................................................38
7.2.66 VSEN Limit High Byte 1 Register .................................................................................38
7.2.67 VSEN Limit High Byte 2 Register .................................................................................38
7.2.68 FANIN1 Limit Low Byte Register ..................................................................................38
7.2.69 FANIN2 Limit Low Byte Register ..................................................................................39
7.2.70 FANIN3 Limit Low Byte Register ..................................................................................39
7.2.71 FANIN1 Limit High Byte Register .................................................................................39
7.2.72 FANIN2 Limit High Byte Register .................................................................................39
7.2.73 FANIN3 Limit High Byte Register .................................................................................40
7.2.74 ALERT Mask Register Register....................................................................................40
7.2.75 ALERT/SMI Mask Temperature Channel Register.......................................................40
7.2.76 ALERT/SMI Mask Fan Channel Register .....................................................................41
7.2.77 SMI Mask Voltage Channel Register............................................................................41
7.2.78 T_CRIT# Mask Register...............................................................................................41
7.2.79 GPIO Alert Mask Register ............................................................................................42
7.2.80 GPIO Enable Register..................................................................................................42
7.2.81 GPIO Mode Register ....................................................................................................42
Feb, 2012
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Version: 1.2
NCT7802Y
7.2.82 GPIO Output Type Register..........................................................................................43
7.2.83 GPIO Input Data Register.............................................................................................43
7.2.84 GPIO Output Data Register..........................................................................................43
7.2.85 BEEP Voltage Channel Enable Register......................................................................44
7.2.86 BEEP Fan Channel Enable Register............................................................................44
7.2.87 BEEP Temperature Channel Enable Register..............................................................44
7.2.88 BEEP Enable Register .................................................................................................45
7.2.89 Fan Control Output Type..............................................................................................45
7.2.90 Fan Control Output Mode.............................................................................................45
7.2.91 Fan Control 1 Output Value..........................................................................................46
7.2.92 Fan Control 2 Output Value..........................................................................................46
7.2.93 Fan Control 3 Output Value..........................................................................................46
7.2.94 Close-Loop Fan Control RPM mode Register and Configure Register of PECI Error
(CRPE) 46
7.2.95 Temperature to Fan mapping Relationships Register ..................................................47
7.2.96 Temperature to Fan mapping Relationships Register ..................................................47
7.2.97 Fan Control Configuration Register 1 ...........................................................................48
7.2.98 Fan Control Configuration Register 2 ...........................................................................48
7.2.99 Fan Control Configuration Register 3 ...........................................................................49
7.2.100 Fan Control Configuration Register 4 .........................................................................49
7.2.101 Close-Loop Fan Control RPM mode Tolerance Register ...........................................49
7.2.102 FANCTL Step Up Time Register ................................................................................50
7.2.103 FANCTL Step Down Time Register............................................................................50
7.2.104 Default Fan Speed Register .......................................................................................50
7.2.105 FANCTL1 PWM Prescalar Register ...........................................................................50
7.2.106 FANCTL2 PWM Prescalar Register ...........................................................................51
7.2.107 FANCTL3 PWM Prescalar Register ...........................................................................52
7.2.108 Temp1 Hystersis Register ..........................................................................................52
7.2.109 Temp2 Hystersis Register ..........................................................................................52
7.2.110 Temp3 Hystersis Register ..........................................................................................52
7.2.111 FANCTL Start Duty Cycle Register ............................................................................53
7.2.112 FANCTL Stop Time Register......................................................................................53
7.2.113 NonStop Disable Register ..........................................................................................53
7.2.114 Fan Output Min Value when PECI Error Register (FOMV).........................................53
7.2.115 Table 1 X-axis Transition Point 1 Register .................................................................54
7.2.116 Table 1 X-axis Transition Point 2 Register .................................................................54
7.2.117 Table 1 X-axis Transition Point 3 Register .................................................................54
7.2.118 Table 1 X-axis Transition Point 4 Register .................................................................54
7.2.119 Table 1 X-axis Critical Point Register .........................................................................55
7.2.120 Table 1 Y-axis Transition Point 1 Register .................................................................55
7.2.121 Table 1 Y-axis Transition Point 2 Register .................................................................55
7.2.122 Table 1 Y-axis Transition Point 3 Register .................................................................55
7.2.123 Table 1 Y-axis Transition Point 4 Register .................................................................56
7.2.124 Table 2 X-axis Transition Point 1 Register .................................................................56
Feb, 2012
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Version: 1.2
NCT7802Y
7.2.125 Table 2 X-axis Transition Point 2 Register .................................................................56
7.2.126 Table 2 X-axis Transition Point 3 Register .................................................................56
7.2.127 Table 2 X-axis Transition Point 4 Register .................................................................57
7.2.128 Table 2 X-axis Critical Point Register .........................................................................57
7.2.129 Table 2 Y-axis Transition Point 1 Register .................................................................57
7.2.130 Table 2 Y-axis Transition Point 2 Register .................................................................57
7.2.131 Table 2 Y-axis Transition Point 3 Register .................................................................58
7.2.132 Table 2 Y-axis Transition Point 4 Register .................................................................58
7.2.133 Table 3 X-axis Transition Point 1 Register .................................................................58
7.2.134 Table 3 X-axis Transition Point 2 Register .................................................................58
7.2.135 Table 3 X-axis Transition Point 3 Register .................................................................59
7.2.136 Table 3 X-axis Transition Point 4 Register .................................................................59
7.2.137 Table 3 X-axis Critical Point Register .........................................................................59
7.2.138 Table 3 Y-axis Transition Point 1 Register .................................................................59
7.2.139 Table 3 Y-axis Transition Point 2 Register .................................................................60
7.2.140 Table 3 Y-axis Transition Point 3 Register .................................................................60
7.2.141 Table 3 Y-axis Transition Point 4 Register .................................................................60
7.2.142 TD1 Offset Register....................................................................................................60
7.2.143 TD2 Offset Register....................................................................................................61
7.2.144 TR1 Offset Register....................................................................................................61
7.2.145 TR2 Offset Register....................................................................................................61
7.2.146 TR3 Offset Register....................................................................................................61
7.2.147 Digital Filter Level Select Register..............................................................................62
7.2.148 Programmable Temperature 1 Register .....................................................................62
7.2.149 Programmable Temperature 2 Register .....................................................................62
7.2.150 Software Reset Register.............................................................................................62
7.2.151 Vendor ID Register.....................................................................................................63
7.2.152 Chip ID Register.........................................................................................................63
7.2.153 Version ID Register ....................................................................................................63
7.3
7.4
BANK 1 REGISTER MAP............................................................................................. 64
BANK 1 REGISTER DETAIL........................................................................................ 66
7.4.1 PECI Control Register 1 .................................................................................................66
7.4.2 PECI Control Register 2 .................................................................................................66
7.4.3 PECI Control Register 3 .................................................................................................66
7.4.4 Report Temperature Style Register................................................................................67
7.4.5 Address Content for Manual Command Register...........................................................67
7.4.6 Write Length for Manual Command Register .................................................................67
7.4.7 Read Length for Manual Command Register .................................................................68
7.4.8 Command Code for Manual Command Register............................................................68
7.4.9 Agent0 Base Temperature Register ...............................................................................68
7.4.10 Agent1 Base Temperature Register .............................................................................68
7.4.11 Generic Write in Data 1 to Client Register....................................................................69
7.4.12 Generic Write in Data 2 to Client Register....................................................................69
Feb, 2012
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Version: 1.2
NCT7802Y
7.4.13 Generic Write in Data 3 to Client Register....................................................................69
7.4.14 Generic Write in Data 4 to Client Register....................................................................69
7.4.15 Generic Write in Data 5 to Client Register....................................................................70
7.4.16 Generic Write in Data 6 to Client Register....................................................................70
7.4.17 Generic Write in Data 7 to Client Register....................................................................70
7.4.18 Generic Write in Data 8 to Client Register....................................................................70
7.4.19 Generic Write in Data 9 to Client Register....................................................................71
7.4.20 Generic Write in Data 10 to Client Register..................................................................71
7.4.21 Generic Write in Data 11 to Client Register..................................................................71
7.4.22 Generic Write in Data 12 to Client Register..................................................................71
7.4.23 Agent Relative Temperature Register ..........................................................................72
7.4.24 Agent Characteristic Register.......................................................................................73
7.4.25 Generic Read Out Data 1 from Client Register.............................................................73
7.4.26 Generic Read Out Data 2 from Client Register.............................................................74
7.4.27 Generic Read Out Data 3 from Client Register.............................................................74
7.4.28 Generic Read Out Data 4 from Client Register.............................................................74
7.4.29 Generic Read Out Data 5 from Client Register.............................................................74
7.4.30 Generic Read Out Data 6 from Client Register.............................................................75
7.4.31 Generic Read Out Data 7 from Client Register.............................................................75
7.4.32 Generic Read Out Data 8 from Client Register.............................................................75
7.4.33 Generic Read Out Data 9 from Client Register.............................................................75
8.
ELECTRICAL CHARACTERISTICS......................................................................................... 76
8.1
8.2
8.3
Absolute Maximum Ratings.......................................................................................... 76
DC Characteristics........................................................................................................ 76
AC Characteristics ........................................................................................................ 77
9.
ORDERING INFORMATION..................................................................................................... 78
TOP MARKING SPECIFICATIONS.......................................................................................... 78
PACKAGE DRAWING AND DIMENSIONS.............................................................................. 79
REVISION HISTORY................................................................................................................ 80
10.
11.
12.
Feb, 2012
- VI -
Version: 1.2
NCT7802Y
1. GENERAL DESCRIPTION
NCT7802Y is a Nuvoton Hardware Monitor IC, which can monitor several critical hardware parameters
of the systems, including power supply voltages, fan speeds, and temperatures, to make the system
work stably and efficiently, especially for server and workstation applications.
NCT7802Y supports one on-die and up to 5 remote temperature sensors with SMBus interface.
There‟s a 10-bit analog-to-digital converter (ADC) is built inside NCT7802Y, to convert the monitored
temperature values. The remote inputs can be connected to CPU/GPU thermal diode or any thermal
diode sensors and thermistor, it also can get the Intel® CPU temperature directly via Intel ® PECI3.0
interface.
Additionally, the NCT7802Y can monitor up to 5 analog voltage inputs, 3 fan tachometer inputs and
TM
supports up to 6 multifunctional GPIO. The SMART FAN IV mode provides 4 sets of temperature
setting points, and they can also control the duty cycle of fan outputs. It provides an easy method to
implement quiet and cooling solution with maximum safety and flexibility.
Meanwhile, there‟re 5 pure hardware event pins for independent alarm signals, and the all threshold
values could be set for system protection without any timing delay.
2. FEATURES
2.1 Temperature Measurement
Measure the temperature with high accuracy
One local on-die thermal sensor
Two pairs thermal diode (current mode) temperature channels
Three thermistor mode temperature channels
Support Intel® PECI 3.0 interfaces for reading Intel® CPU temperature
2.2 Voltage Measurement
Up to five voltage inputs, three multi-functions with thermal diode pair
2.3 Fan Control
Three fan control outputs multi-function (PWM mode supported)
Two fan control outputs support DC mode
Three fan tachometer input multi-function
SMART FANTM IV mode or Manual mode to control the fan speed
2.4 Event Notification
Support 5 alarm outputs: ALERT#, T_CRIT#, RESET#, SMI#, BEEP signals to activate system
protection.
ALERT# output supports SMBusTM 2.0 ARA function
Feb, 2012
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Version: 1.2
NCT7802Y
2.5 General
Provide up to 6 GPIO pins (multi-function with fan control).
I2C® Compatible System Management bus (SMBus)
Support 8 SMBus address selection
Programming from EEPROM support
3.3V±5% VCC operation
20-pin QFN package (Halogen free)
3. KEY SPECIFICATIONS
Voltage monitoring accuracy
VSEN input
10mV
80mV
VCC input
Temperature Sensor Accuracy
Remote Diode Sensor Accuracy (25~85C)
On-chip Temperature Sensor Accuracy (25~70C)
Remote Temperature Sensor Resolution
On-chip Temperature Sensor Resolution
Supply Voltage
1C typ.
2C typ.
0.125C
1 C
3.3V 5%
Operating Supply Current
VCC
5mA typ.
VTT
< 1mA
-40C ~ 85C *1
Operating Temperature Range
*1 Guaranteed by design from -40~85 degree C, 100% tested at 85 degree C.
Feb, 2012
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Version: 1.2
NCT7802Y
4. PIN CONFIGURATION
15 14 13 12 11
SCL
FANCTL3/GPIO6/ADD2 16
GND 17
10
9 SDA
VCORE 18
8 T_CRIT#/BEEP
7 ALERT#/SMI#
6 RESET#
NCT7802Y
TD2-/TR3/VSEN3 19
TD2+/TR2/VSEN2 20
1
2
3
4
5
‧
5. PIN DESCRIPTION
5.1 PIN TYPE DISCRIPTION
PIN TYPE
PIN ATTRIBUTE
Open-drain output pin with 12 mA sink capability
OD12
INts
TTL level input pin and schmitt trigger, with 5V tolerance support
Type of PECI
V1
AIN
Input pin (Analog)
OUT12
AOUT
P
Output pin with 12 mA sink/source capability
Output pin (Analog)
Power or Ground Pin
Feb, 2012
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Version: 1.2
NCT7802Y
5.2 PIN DISCRIPTION
PIN NO.
PIN NAME
TD1-
I/O
AIN
FUNCTION
Connect to Thermal Diode 1 Cathode
VREF output for Thermistor function
Connect to Thermal Diode 1 Anode
Thermistor 1 sensing input
1
VREF
TD1+
AOUT
2
3
TR1
AIN
VSEN1
Voltage sensing input. Detection range is 0~2.048V
Power supply, Voltage input 3.3V±5%
It is also a voltage sensing input
VCC
P
4
5
6
VTT
PECI
P
Intel® CPU Vtt power
V1
Intel® CPU PECI interface
RESET#
ALERT#
SMI#
OD12
Reset alarm output, for detect VCC power fault
Alarm output, for interrupt control (default)
Alarm output, for interrupt control
7
8
OD12
OD12
T_CRIT alarm output, for interrupt or shutdown
control. (default)
T_CRIT#
BEEP
SDA
BEEP output when abnormal event occurs
(Frequency:300Hz/600Hz, Tone=500mS)
9
INts/OD12
INts
SMBus bi-directional data
SMBus Clock
10
SCL
FANIN1
GPIO1
INts
Fan tachometer input (default)
11
12
13
INts /OD12
/OUT12
General purpose I/O function
Fan speed control PWM/DC output
It can be configured to PWM/DC mode by registers.
Default is PWM output
OUT12/OD12
/AOUT
FANCTL1
As DC output, 256 steps output voltage scaled to
0~VCC
INts /OD12
/OUT12
GPIO2
FANIN2
GPIO3
General purpose I/O function
Fan tachometer input (default)
General purpose I/O function
INts
INts /OD12
/OUT12
Feb, 2012
Version: 1.2
- 4 -
NCT7802Y
PIN NO.
PIN NAME
FANCTL2
I/O
FUNCTION
Fan speed control PWM/DC output
It can be configured to PWM/DC mode by registers.
Default is PWM output
OUT12/OD12
/AOUT
14
As DC output, 256 steps output voltage scaled to
0~VCC
INts /OD12
/OUT12
GPIO4
FANIN3
GPIO5
FANCTL3
GPIO6
GND
General purpose I/O function
INts
Fan tachometer input (default)
15
16
INts /OD12
/OUT12
General purpose I/O function
OUT12/OD12
Fan speed control PWM output
INts /OD12
/OUT12
General purpose I/O function
17
18
P
Power supply ground
VCORE
TD2-
AIN
Voltage sensing input. Detection range is 0~2.048V
Connect to Thermal Diode 2 Cathode
Thermistor 3 sensing input
19
20
TR3
AIN
AIN
VSEN3
TD2+
Voltage sensing input. Detection range is 0~2.048V
Connect to Thermal Diode 2 Anode
Thermistor 2 sensing input
TR2
VSEN2
Voltage sensing input. Detection range is 0~2.048V
Feb, 2012
Version: 1.2
- 5 -
NCT7802Y
6. DESCRIPTION
6.1 GENERAL DESCRIPTION
The NCT7802Y is a Nuvoton Hardware Monitor IC, contains one on-die and up to 5 remote
temperature sensors, with SMBus and Intel PECI3.0 interface. There‟re also five voltage monitoring
channels, 3 fan control groups, and GPIO functions with SMBus interface. NCT7802Y supports up to 8
sets SMBus address selection, it also provides ALERT#/SMI#/T_CRIT#/BEEP and RESET# alarm
signals for event notification.
6.2 ACCESS INTERFACE
NCT7802Y provides SMBus to access the internal register, supports SMBus byte write and byte read
protocols.
6.2.1 Data write to the internal register
6.2.2 Data read from the internal register
Feb, 2012
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Version: 1.2
NCT7802Y
6.3 ADDRESS SETTING
NCT7802Y has three address pins and multi-function with FANCTRL1~3, the SMBus address will be
strapped when VCC ready 100mS, during the 100mS, the level of strapping pins must be fixed. The
address will be retained as long as the VCC of NCT7802Y is maintained. The pull-up power plane
must be the same as the VCC power of NCT7802Y.
ADD0(FANCTRL1)
ADD1(FANCTRL2)
ADD2(FANCTRL3)
ADDRESS
0101 000X
0101 001X
0101 010X
0101 011X
0101 100X
0101 101X
0101 110X*1
0101 111X*2
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
0
0
1
1
1
1
X=Read/Write# Bit
*1 When set the NCT7802Y to address 5Ch, EEPROM loading function will be enabled, EEPROM
address has to be ACh, refer to section 6.15.
*2 When set the NCT7802Y to address 5Eh, EEPROM loading function will be enabled, EEPROM
address has to be AEh, refer to section 6.15.
6.4 TEMPERATURE MONITOR DATA FORMAT
6.4.1 The local temperature (on-die) data with 8-bit 2`s complement format
TEMPERATURE
+127°C
+25°C
+2°C
8-BIT DIGITAL OUTPUT
0111,1111
0001,1001
0000,0010
+1°C
0000,0001
+0°C
0000,0000
- 1°C
1111,1111
- 2°C
1111,1110
- 25°C
- 128°C
1110,0111
1000,0000
Feb, 2012
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Version: 1.2
NCT7802Y
6.4.2 The remote temperature data with 11-bit 2’s complement format
TEMPERATURE
+127.875°C
+25.750°C
+2.250°C
8-BIT DIGITAL OUTPUT HIGH BYTE
0111,1111
3-BIT DIGITAL OUTPUT LOW BYTE
111X,XXXX
0001,1001
110X,XXXX
0000,0010
010X,XXXX
+1.125°C
0000,0001
001X,XXXX
+0.000°C
0000,0000
000X,XXXX
- 1.125°C
1111,1110
111X,XXXX
- 2.250°C
1111,1101
110X,XXXX
- 25.750°C
- 127.875°C
1110,0110
010X,XXXX
1000,0000
001X,XXXX
6.5 VOLTAGE SENSE DATA FORMAT
MNTVSEN Low Byte together with MNTVSEN High Byte forms the 10-bit count value. If MNTVSEN
High Byte readout is read successively, the NCT7802Y will latch the MNTVSEN Low Byte for next
read. Then voltage readout high byte and low byte are combined to 10-bitVoltageValue.
For VSEN1~3 and Vcore monitoring, real voltage calculations should follow the formula:
Voltage(V) 10bitCountValue0.002
VOLTAGE
+2 V
MNTVSEN HIGH BYTE
1111,1010
MNTVSEN LOW BYTE
00XX,XXXX
+1 V
0111,1101
00XX,XXXX
+0.036 V
+0 V
0000,0100
10XX,XXXX
0000,0000
00XX,XXXX
For VCC monitoring, real voltage calculations should follow the formula:
Voltage(V) 10bitCountValue0.004
6.6 FAN_IN Count Calculation
The FAN_IN tachometer high byte and low byte are combined to 13-bitCountValue. Real RPM (Rotate
per Minute) calculation should follow the formula:
1.35106
FanSpeed(RPM )
FanPoles
(13 bitCountValue)(
)
4
In this formula, FanPoles stands for the number of NS pole pairs inside the fan. Normally an N-S-N-S
Fan (FanPoles=4) generates 2 pulses after completing one rotation.
Feb, 2012
- 8 -
Version: 1.2
NCT7802Y
6.7 FAN_OUT Duty Cycle / DC Level Calculation
The NCT7802Y provides 3 set of PWM for fan speed control. The duty cycle of PWM can be
programmed by an 8-bit register. The expression of duty cycle can be represented as follow formula:
Programmed 8- bit Register Value
255
Duty cycle(%)
100%
The NCT7802Y provides 2 set of DC output for fan speed control on FANCTL1 and FANCTL2. The
DC output can be programmed by an 8-bit register. The expression of DC level can be represented as
follow formula:
Programmed 8- bit Register Value
OutputVoltage (V) VCC
255
6.8 SMART FANTM IV Control Parameters
In SMART FANTM IV Mode, there are some Fan control parameters as below descriptions:
6.8.1 Step Up Time / Step Down Time
TM
SMART FAN IV is designed for the smooth operation of the fan. The Up Time / Down Time register
defines the time interval between successive duty increases or decreases. If this value is set too
small, the fan will not have enough time to speed up after tuning the duty and sometimes may result in
unstable fan speed. On the other hand, if Up Time / Down Time is set too large, the fan may not work
fast enough to dissipate the heat. This register should never be set to 0, otherwise, the fan duty will be
abnormal.
6.8.2 Fan Output Start-up Value
From still to rotate, the fan usually needs a higher fan output value to generate enough torque to
conquer the restriction force. Thus the Fan Output Start-up Value is used to turn on the fan with the
specified output value.
6.8.3 Fan Output Nonstop
It takes some time to bring a fan from still to working state. Therefore, Nonstop value are designed
with first FANCTL step output to keep the fan working when the system does not require the fan to
help reduce heat but still want to keep the fast response time to speed up the fan.
6.8.4 Fan Output Stop Time
A time interval is specified to turn off the fan if SMART FANTM IV continuously requests to slow down the
fan which has already reached the Stop time.
UpTime
DownTime
FanSpeed
StopTime
Smart Fan Lowering
FanSpeed
Smart Fan Arising Fan
Speed
Figure 6-1 SMART FANTM IV Control Parameters
Feb, 2012
- 9 -
Version: 1.2
NCT7802Y
6.9 SMART FANTM IV
SMART FANTM IV supports Fan Duty Outputs Mode and Close Loop Fan Control (RPM) Mode to
control the fan speed.
There‟re 3 slopes can be obtained by setting FanDuty/RPM1~FanDuty/RPM4 and T1~T4 through the
registers. When the temperature rises, FAN Output will calculate the target FanDuty/RPM based on
the current slope. For example, assuming Tx is the current temperature and FanDuty/RPM is the
target, then the slope:
FanDuty3/ RPM 3
FanDuty2/ RPM 2
X 2
T3T2
Fan Output:
T arget FanDuty or RPM
FanDuty2 or RPM 2
Tx T2 X2
Figure 6-2 SMART FANTM IV Mechanism
Fanduty/RPM
(unit RPM = 50 )
Critical Hyst.
Operation Hyst.
FullSpeed (FF, 100%)
Fanduty4/RPM4
Fanduty3/RPM3
X3
Ty
X2
Fanduty2/RPM2
X1
Fanduty1/RPM1
Temperature
Tx
T1
T2
T3
T4 TRCritical
In addition, SMART FANTM IV can also set up Critical Temperature and Hysteresis. If the current
temperature exceeds Critical Temperature, external fan will be forced by maximum FanDuty to meet
the largest target FanDuty or RPM, Which is 0xFF. The target FanDuty & RPM value will be
determined in accordance to the slope only when the temperature falls below (TCritical – Critical
Hyst).
NCT7802Y provide 3 temperature sources selection to map the fan, the algorithm will make a decision
to control the fan as below figure:
Feb, 2012
- 10 -
Version: 1.2
NCT7802Y
Any Temp request
faster Fan??
Yes
Speed Up
No
Any Temp request f
hold current speed??
Hold current
Speed
Yes
No
Slow Down
6.10 PECI
PECI (Platform Environment Control Interface) is a new digital interface to read the CPU temperature
of Intel® CPUs. With a bandwidth ranging from 2 Kbps to 2 Mbps, PECI uses a single wire for self-
clocking and data transfer. By interfacing to the Digital Thermal Sensor (DTS) in the Intel® CPU, PECI
reports a negative temperature (in counts) relative to the processor‟s temperature at which the thermal
control circuit (TCC) is activated. At the TCC Activation temperature, the Intel CPU will operate at
reduced performance to prevent the device from thermal damage.
PECI is one of the temperature sensing methods that the NCT7802Y supports. The NCT7802Y
contains a PECI master and reads the CPU PECI temperature. The CPU is a PECI client.
The PECI temperature values returning from the CPU are in “counts” which are approximately linear in
relation to changes in temperature in degrees centigrade. However, this linearity is approximate and
cannot be guaranteed over the entire range of PECI temperatures. For further information, refer to the
PECI specification. All references to “temperature” in this section are in “counts” instead of “°C”.
Figure 6-3 shows a typical fan speed (PWM duty cycle) and PECI temperature relationship.
Fan Speed
(PWM Duty Cycle)
Tcontrol
TCC Activation
Duty1
Duty2
-20
-10
0
PECI Temperature (counts)
Figure 6-3 PECI Temperature
Feb, 2012
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Version: 1.2
NCT7802Y
In this illustration, when PECI temperature is -20, the PWM duty cycle for fan control is at Duty2.
When CPU is getting hotter and the PECI temperature is -10, the PWM duty cycle is at Duty1.
At Tcontrol PECI temperature, the recommendation from Intel is to operate the CPU fan at full speed.
Therefore Duty1 is 100% if this recommendation is followed. The value of Tcontrol can be obtained by
reading the related Machine Specific Register (MSR) in the Intel CPU. The Tcontrol MSR address is
usually in the BIOS Writer‟s guide for the CPU family in question. Refer to the relevant CPU
documentation from Intel for more information. In this example, Tcontrol is -10.
When the PECI temperature is below -20, the duty cycle is fixed at Duty2 to maintain a minimum (and
constant) RPM for the CPU fan.
NCT7802Y‟s fan control circuit can only accept positive real-time temperature inputs and limits setting
TM
(when SMART FAN
IV mode). The device provides offset registers to „shift‟ the negative PECI
readings to positive values otherwise the fan control circuit will not function properly. The offset
registers are the Tbase registers located at Bank1, Index09h and Index0Ah. All default values of these
Tbase registers are 8‟h00.These registers should be programmed with (positive) values so that the
resultant value (Tbase + PECI) is always positive. The unit of the Tbase register contents is “count” to
match that of PECI values. The resultant value (Tbase + PECI) should not be interpreted as the
“temperature” (whether in count or °C) of the PECI client (CPU).
Figure 6-4 Temperature and Fan Speed Relation after Tbase Offsets shows the temperature/fan
speed relationship after Tbase offsets are applied (based on Figure 6-3 PECI Temperature). This view
is from the perspective of the NCT7802Y fan control circuit.
Figure 6-4 Temperature and Fan Speed Relation after Tbase Offsets
Assuming Tbase is set to 100 and the PECI temperature is -15 , the real-time temperature value to the
fan control circuit will be 85 (-15 + 100). The value of 55 (hex) will appear in the relevant real-time
temperature register.
TM
While using SMART FAN IV control function of NCT7802Y, BIOS/software must include Tbase in
determining the thresholds (limits). In this example, assuming Tcontrol is -10 and Tbase is set to 100,
Feb, 2012
- 12 -
Version: 1.2
NCT7802Y
the threshold temperature value corresponding to the “100% fan duty cycle” event is 90 (-10+100).
The value of 5A (hex) should be written to the relevant threshold register.
Tcontrol is typically -10 to -20 for PECI-enabled CPUs. Base on that, a value of 85 ~100 for Tbase
could be set for proper operation of the fan control circuit. This recommendation is applicable for
most designs. In general, the concept presented in this section could be used to determine the
optimum value of Tcontrol to match the specific application.
6.11 ALERT# Output
The NCT7802Y ALERT# pin is an active-low open-drain output pin which is triggered when
temperature measured and fan exceeds the limitation defined in the limit registers.
6.11.1 ALERT# Output Mechanism
Figure 6-5 shows the mechanism of the ALERT# output. In this mode, the NCT7802Y will set the
ALERT mask bit of Configuration Register during a read of the Status Register if any flag in Status
Register, except the ADC_Busy flag and Remote Diode Open flag, is set. This prevents further
ALERT# triggering until the master has reset the ALERT mask bit (write 0 to Alert_MSK in Bank0
CR[21h] Bit7), at the end of the interrupt service routine. The Status Register flags are cleared only
upon a read Status Register command from the master and will be re-alerted at the end of the next
temperature conversion if the measured temperature still falls outside of the allowed range.
Temperature
Value
Temp
Limt
Alert#
Status
Alert
Mask
Clear Mask Read Status
ARA
register
register
Figure 6-5 ALERT# Output Mechanism
Feb, 2012
Version: 1.2
- 13 -
NCT7802Y
6.11.2 ALERT# Response Address
Figure 6-6 shows the mechanism of the SMBus ALERT# Response Address (ARA) support on
ALERT# output. In this mode, the ALERT# output of the NCT7802Y is connected to the SMBus alert
line which has more than one device connected to it. Through such and implementation, SMBus alert
mode can assist the master in resolving which salve generates an interrupt. When the measured
temperature falls outside of the allowed range, the ALERT# pin will be pulled low and the
corresponding alert flags in Status Register will be set to 1. The ALERT# mask bit will just be set if
there is a read command for Status Register or when ARA occurs from master (Alert Response
Address is 0001100x). Meanwhile, the NCT7802Y will generate and return its own address to the
master. If the temperature never falls outside of the allowed range, the latched ALERT# pin can
release by the reset ALERT mask bit and the latched corresponding alert flags in Status Register can
release by reading command for Status Register.
Figure 6-6 SMBus ARA Mechanism
6.12 T_CRIT# Output
T_CRIT# output pulls low when the measured temperature exceeds the critical temperature threshold
point. Once the T_CRIT# output pulls low, it will not be set high until the measured temperature is
lower than critical temperature threshold point.
6.13 SMI# Output
6.13.1 Temperature
SMI# for temperature monitoring provides 3 modes: Comparator Interrupt Mode, Two-Times Interrupt
Mode, and the One-Time Interrupt Mode.
6.13.1.1.
Comparator Interrupt Mode
Temperature exceeding TO causes an interrupt and this interrupt will be reset when reading all of the
Interrupt Status Registers. Once an interrupt event has occurred by exceeding TO, then reset, if the
temperature remains above the THYST, the interrupt will occur again when the next conversion has
completed. If an interrupt event has occurred by exceeding TO and not reset, the interrupts will not
occur again. The interrupts will continue to occur in this manner until the temperature goes below
THYST
.
Feb, 2012
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Version: 1.2
NCT7802Y
6.13.1.2.
Two-Times Interrupt Mode
Temperature exceeding TO causes an interrupt and then temperature going below THYST will also
cause an interrupt if the previous interrupt has been reset by reading all the interrupt Status Register.
Once an interrupt event has occurred by exceeding TO, then reset, if the temperature remains above
the THYST, the interrupt will not occur.
6.13.1.3.
One-Time Interrupt Mode
Temperature exceeding TO causes an interrupt and then temperature going below THYST will not cause
an interrupt. Once an interrupt event has occurred by exceeding TO, then going below THYST, an
interrupt will not occur again until the temperature exceeding TO.
Feb, 2012
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Version: 1.2
NCT7802Y
6.13.2 Voltage
SMI# interrupt for voltage is Two-Times Interrupt Mode. Voltage exceeds high limit or going below low
limit, it will causes an interrupt if the previous interrupt has been reset by reading all the interrupt
Status Register.
6.13.3 Fan
SMI# interrupt for fan is Two-Times Interrupt Mode. Fan count exceeds the limit, or exceeding and
then going below the limit, it will cause an interrupt if the previous interrupt has been reset by reading
all the interrupt Status Register.
6.14 RESET# Output
The NCT7802Y provides a reset controller for the system‟s 3.3V supply rail. The RESET# pin will pull
low pulse when the measured VCC below the threshold voltage. The RESET# pin set to „1‟ after the
3.3V VCC supply rises above its threshold voltage.
6.15 Self-Programming from EEPROM
The NCT7802Y supports self-programming through an external I2C EEPROM during NCT7802Y
power-on. The EEPROM is recommended to be 24C02 type. During 200ms period after power on,
NCT7802Y will detect if the external EEPROM exists by issuing the SMBus Byte Read command with
50KHz SMBus clock frequency. If a NACK of SMBus protocol is detected, NCT7802Y will stop self-
programming, otherwise, NCT7802Y will keep loading data from external EEPROM sequentially to
Bank0 Index 00h~E2h registers. Therefore, other SMBus master has to avoid from accessing
NCT7802Y during the 200ms after power-on.
Please also refer to NCT7802Y APN for self-programming implementation.
Feb, 2012
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Version: 1.2
NCT7802Y
7. REGISTER DESCRIPTION
7.1 BANK0 REGISTER MAP
Idx
Register Name
Att
Df
7
6
5
4
3
2
1
0
0
Bank Select
R/W 00
RSV
BKSEL
1
Read RTD1 High Byte
Read RTD2 High Byte
Read RTD3 High Byte
Read LTD High Byte
Read Temp Low Byte
R
R
R
R
R
R
00
00
00
00
00
00
MNTRTD1[10:3]
MNTRTD2[10:3]
MNTRTD3[10:3]
MNTLTD[7:0]
2
3
4
5
MNTTD_Lsb[2:0]
RSV
Read PECI 0 Temp High
6
MNTPECI0[9:2]
MNTPECI1[9:2]
Byte
Read PECI1 Temp High
Byte
7
8
R
R
R
R
R
R
R
R
R
00
00
00
00
00
00
00
00
FF
Read PECI Low Byte
Read VCC
MNTPECI_Lsb[1:0]
RSV
9
MNTVCC[9:2]
MNTVCore[9:2]
MNTVSEN1[9:2]
MNTVSEN2[9:2]
MNTVSEN3[9:2]
A
C
D
E
F
Read VCore
Read VSEN1
Read VSEN2
Read VSEN3
Read Volt Low Byte
MNTV_Lsb[1:0]
RSV
Read Fan Count 1High
10
MNTFAN1[12:5]
MNTFAN2[12:5]
MNTFAN3[12:5]
Byte
Read Fan Count 2High
Byte
Read Fan Count 3High
Byte
11
12
13
15
R
R
FF
FF
Read Fan Count 1Low
Byte
R
R
R
R
F8
00
00
00
MNTFAN_Lsb[4:0]
MNTIMON_Percent
RSV
MNTIMON_Percent
17 Diode Fault Alert Status
RSV
STS_PEC STS_PEC
I1 I0
STS_PEC STS_PEC
I1 I0
FAN_TAR FAN_TAR FAN_TAR
STS_DF3 STS_DF2 STS_DF1
STS_AL4 STS_AL3 STS_AL2 STS_AL1
STS_AH4 STS_AH3 STS_AH2 STS_AH1
18
19
1A
1B
1C
1D
1E
1F
Low Alert Status
High Alert Status
Fan Alert Status
TCRIT Alert Status
GPIO Alert Status
SMI Temp Status
SMI Voltage status
SMI FAN status
RSV
RSV
R
R
R
R
R
R
R
R
00
00
00
00
00
00
00
00
RSV
RSV
FAN_FC3 FAN_FC2 FAN_FC1
3
2
1
STS_PEC STS_PEC
RSV
RSV
RSV
STS_TC4 STS_TC3 STS_TC2 STS_TC1
I1
I0
STS_GPI STS_GPI STS_GPI STS_GPI STS_GPI STS_GPI
O6
O5
O4
O3
O2
O1
STS_PEC STS_PEC
STS_RTD STS_RTD STS_RTD
STS_LTD
I1
I0
3
2
1
STS_VSE STS_VSE STS_VSE
RSV
STS_VCC
RSV
N3
N2
N1
FAN_TAR FAN_TAR FAN_TAR
RSV
FAN_FC3 FAN_FC2 FAN_FC1
3
2
1
RTD3_Te RTD2_Te RTD1_Te
20 TCRIT Real Time Status
RSV
LTD_Texc
xc
xc
xc
Feb, 2012
- 17 -
Version: 1.2
NCT7802Y
Idx
21
22
23
24
Register Name
START
Att
Df
7
6
5
4
3
2
1
0
R/W 01 Msk_Alert
RSV
START
Mode Selection
PECI Enable
Fan Enable
R/W 7F
R/W 00
R/W 07
RSV
EnLTD
RTD3_MD
RTD2_MD
RTD1_MD
EnPECI1 EnPECI0
RSV
RSV
EnFan3 EnFan2 EnFan1
EnVCore EnVCC
ConvRate[1:0]
25 Voltage monitor Enable R/W 03
RSV
RSV
RSV
26
27
28
29
Conversion Rate
Fault Queue
R/W 03
R/W 03
R/W 00
R/W 04
FaultQueue[1:0]
Alert High link to
T_CRIT#
RSV
RSV
SYS3
SYS2
SYS1
Reset time setting
SetResetTime
2A Reset Limit Low Byte R/W EE
ResetLimit[7:0]
2B
2F
Reset Limit High Byte
SMI Control
R/W 80
R/W 00
ResetLimit[9:8]
ALERT_S TCRIT_B SMI_MO
RSV
OVT_MO
SMI_POL
En_SMI
TempSmiMode
MI_Sel
EEP_Sel
D
D
30 RTD1 Temp High Limit R/W 55
31 RTD1 Temp Low Limit R/W 00
RTD1_HL
RTD1_LL
RTD2_HL
RTD2_LL
RTD3_HL
RTD3_LL
LTD_HL
LTD_LL
32 RTD2 Temp High Limit R/W 55
33 RTD2 Temp Low Limit R/W 00
34 RTD3 Temp High Limit R/W 55
35 RTD3 Temp Low Limit R/W 00
36
37
38
39
LTD Temp High Limit
LTD Temp Low Limit
DTS Temp High Limit
DTS Temp Low Limit
R/W 55
R/W 00
R/W 55
R/W 00
DTS_HL
DTS_LL
3A RTD1 TCRIT Threshold R/W 64
3B RTD2 TCRIT Threshold R/W 64
3C RTD3 TCRIT Threshold R/W 64
3D LTD TCRIT Threshold R/W 64
TCRIT_RTD1
TCRIT_RTD2
TCRIT_RTD3
TCRIT_LTD
3E DTS TCRIT Threshold R/W 64
Vsen1 High Limit Low
TCRIT_DTS
3F
R/W FF
VSEN1_HL[7:0]
VSEN1_LL[7:0]
VSEN2_HL[7:0]
Byte
40 Vsen1 Low Limit low Byte R/W 00
Vsen2 High Limit low
41
42
43
R/W FF
R/W 00
R/W FF
Byte
Vsen2 Low Limit low
sByte
Vsen3 High Limit low
Byte
VSEN2_LL[7:0]
VSEN3_HL[7:0]
VSEN3_LL[7:0]
VCC_HL[7:0]
VCC_LL[7:0]
44 Vsen3 Low Limit low Byte R/W 00
45 VCC High limit low byte R/W FF
46 VCC Low limit low byte R/W 00
47
VSEN high Byte 1
R/W CC
VSEN1_HL[9:8]
VSEN1_LL[9:8]
VSEN2_HL[9:8]
VSEN2_LL[9:8]
Feb, 2012
- 18 -
Version: 1.2
NCT7802Y
Idx
48
Register Name
Att
Df
7
6
5
4
3
2
1
0
VSEN high Byte 2
R/W CC
VSEN3_HL[9:8]
VSEN3_LL[9:8]
VCC_HL[9:8]
VCC_LL[9:8]
49 FANIN1 Limit low Byte R/W FF
4A FANIN2 Limit low Byte R/W FF
4B FANIN3 Limit low Byte R/W FF
4C FANIN1 Limit high byte R/W F8
4D FANIN2 Limit high byte R/W F8
4E FANIN3 Limit high byte R/W F8
FANIN1_HL[7:0]
FANIN2_HL[7:0]
FANIN3_HL[7:0]
FANIN1_HL[12:8]
FANIN2_HL[12:8]
FANIN3_HL[12:8]
RSV
RSV
RSV
Msk_GPI Msk_TAR
4F
50
51
52
53
54
55
56
57
58
59
5A
5B
5C
5D
Alert Mask function
R/W 7F
R/W 3F
R/W 07
RSV
Msk_TC
Msk_FC Msk_AH Msk_AL Msk_DF
O
T
Alert / SMI Mask Temp
Channel
Alert / SMI Mask FAN
Channel
SMI Mask Voltage
Channel
Msk_Peci Msk_Peci
Msk_RTD Msk_RTD Msk_RTD
Msk_LTD
RSV
1
0
3
2
1
Msk_Fan Msk_Fan
RSV
Msk_Fan3
2
1
Msk_VSE Msk_VSE Msk_VSE
R/W 8F Msk_Reset
R/W BF Msk_ALL
RSV
Msk_VCC
Msk_LTD
N3
N2
N1
Msk_Peci Msk_Peci
MSk_RTD Msk_RTD Msk_RTD
TCRIT Mask
GPIO Alert Mask
GPIO Enable
RSV
1
0
3
2
1
Msk_GPI Msk_GPI Msk_GPI Msk_GPI Msk_GPI Msk_GPI
O6 O5 O4 O3 O2 O1
R/W 3F
R/W 00
R/W 3F
R/W 00
RSV
RSV
RSV
RSV
RSV
RSV
EnGPIO6 EnGPIO5 EnGPIO4 EnGPIO3 EnGPIO2 EnGPIO1
GPIO6
Mode
GPIO6
OB
GPIO5
Mode
GPIO5
OB
GPIO4
Mode
GPIO4
OB
GPIO3
Mode
GPIO3
OB
GPIO2
Mode
GPIO2
OB
GPIO1
Mode
GPIO1
OB
GPIO mode
GPIO output type
GPIO input data
GPIO output data
Beep voltage Enable
Beep Fan Enable
Beep Temp Enable
Beep Enable
R
00
GPIO6 in GPIO5 in GPIO4 in GPIO3 in GPIO2 in GPIO1 in
GPIO6
out
GPIO5
out
GPIO4
out
GPIO3
out
GPIO2
out
GPIO1
out
R/W 00
R/W 00
R/W 00
R/W 00
R/W 00
EnBP_Re EnBP_VC
RSV
EnBP_V3 EnBP_V2 EnBP_V1
EnBP_Fa EnBP_Fa EnBP_Fa
set
C
RSV
n3
n2
n1
EnBP_Pe EnBP_Pe EnBP_LT EnBP_RT EnBP_RT EnBP_RT
RSV
RSV
ci1
ci0
D
D3
D2
D1
EnBP_SM
I
EnBP_DF EnBP_AL EnBP_AH EnBP_TC Beep_En
EnDCFA EnDCFA
5E Fan Control Output Type R/W 00
RSV
N2
N1
PWM3_P PWM2_P PWM1_P
PWM3_O PWM2_O PWM1_O
5F Fan Control Output Mode R/W 00
Fan Control 1 Output
RSV
RSV
ol
ol
ol
FANDuty1
D
D
D
60
61
62
RW 7F
RW 7F
RW 7F
Value
Fan Control 2 Output
Value
Fan Control 3 Output
Value
FANDuty2
FANDuty3
Close-Loop Fan Control
RPM mode Register and
Configure Register of
PECI Error
63
RW 00
TwoDimension
RPM_HIGH_EN
PECIERR
Temperature to Fan
mapping Relationships
Temperature to Fan
mapping Relationships
64
65
RW 00
RW 00
RSV
Temp2FanSelect
RSV
RSV
Temp1FanSelect
Temp3FanSelect
Temp2_Sh
are_En
Temp1_S
hare_En
Temp3_S
hare_En
66 Configuration Register 1 RW 00
67 Configuration Register 2 RW 00
68 Configuration Register 3 RW 00
Temp2_Share_Sel
RSV
Temp1_Share_Sel
Temp3_Share_Sel
Temp1_Sour_Sel
RSV
Temp2_Sour_Sel
RSV
Feb, 2012
- 19 -
Version: 1.2
NCT7802Y
Idx
Register Name
Att
Df
7
6
5
4
3
2
1
0
69 Configuration Register 4 RW 00
Close-Loop Fan Control
RSV
Temp3_Sour_Sel
6D
RW 02
RSV
Generic_Tol_RPM
RPM mode Tolerance
6E
Fanctl Step Up Time
RW 0A
UpTime
DownTime
DefaultFanSpeed
FanOutDivisor1[6:0]
6F Fanctl Step Down Time RW 0A
70
71
72
DefaultFanSpeed
PWM1 Prescalar
PWM2 Prescalar
RW 7F
RW 84
RW 84
FanOutDivi
sor1[7]
FanOutDivi
sor2[7]
FanOutDivisor2[6:0]
FanOutDivi
sor3[7]
73
74
75
76
PWM3 Prescalar
Temp1 Hystersis
Temp2 Hystersis
Temp3 Hystersis
RW 84
RW 53
RW 53
RW 53
FanOutDivisor3[6:0]
RSV
RSV
RSV
Criti_HysT1
Criti_HysT2
Criti_HysT3
RSV
RSV
RSV
Oper_HysT1
Oper_HysT2
Oper_HysT3
77 Fanctl Start Duty Cycle RW 30
StartDutyCycle
78
79
7A
Stop Time of Fanctl
NonStop Enable
RW FF
RW 00
RW 80
StopTime
RSV
NonStop
Fan Output Min Value
when PECI Error
MinDuty_PECIERR
Temp1Table_TR1
Temp1Table_TR2
Temp1Table_TR3
Temp1Table_TR4
80 Table 1 Transition Point 1 RW 19
81 Table 1 Transition Point 2 RW 23
82 Table 1 Transition Point 3 RW 2D
83 Table 1 Transition Point 4 RW 37
84
85
86
87
88
Table 1 Critical Point
RW 3C
RW 8C
RW AA
RW C8
RW E6
Temp1Table_TRCritical
Temp1Table_FL1
Temp1Table_FL2
Temp1Table_FL3
Table 1 Y-axis Transition
Point 1
Table 1 Y-axis Transition
Point 2
Table 1 Y-axis Transition
Point 3
Table 1 Y-axis Transition
Point 4
Temp1Table_FL4
Temp2Table_TR1
Temp2Table_TR2
Temp2Table_TR3
Temp2Table_TR4
Temp2Table_TRCritical
Temp2Table_FL1
90 Table 2 Transition Point 1 RW 19
91 Table 2 Transition Point 2 RW 23
92 Table 2 Transition Point 3 RW 2D
93 Table 2 Transition Point 4 RW 37
94
95
96
97
98
Table 2 Critical Point
RW 3C
RW 8C
RW AA
RW C8
RW E6
Table 2 Y-axis Transition
Point 1
Table 2 Y-axis Transition
Point 2
Table 2 Y-axis Transition
Point 3
Table 2 Y-axis Transition
Point 4
Temp2Table_FL2
Temp2Table_FL3
Temp2Table_FL4
Temp3Table_TR1
Temp3Table_TR2
A0 Table 3 Transition Point 1 RW 19
A1 Table 3 Transition Point 2 RW 23
Feb, 2012
Version: 1.2
- 20 -
NCT7802Y
Idx
Register Name
Att
Df
7
6
5
4
3
2
1
0
A2 Table 3 Transition Point 3 RW 2D
A3 Table 3 Transition Point 4 RW 37
Temp3Table_TR3
Temp3Table_TR4
A4
A5
A6
A7
Table 3 Critical Point
RW 3C
RW 8C
RW AA
RW C8
Temp3Table_TRCritical
Temp3Table_FL1
Table 3 Y-axis Transition
Point 1
Table 3 Y-axis Transition
Point 2
Table 3 Y-axis Transition
Point 3
Table 3 Y-axis Transition
Point 4
Temp3Table_FL2
Temp3Table_FL3
Temp3Table_FL4
A8
C1
C2
C4
C5
C6
CB
RW E6
R/W 3D
R/W 3D
R/W 00
R/W 00
R/W 00
R/W 00
TD1 Offset
TD2 Offset
RSV
RSV
Offset_TD1
Offset_TD2
Offset_TR1
TR1 Offset
RSV
RSV
RSV
TR2 Offset
Offset_TR2
Offset_TR3
TR3 Offset
Filter Level Select
LDT
RT3
PGM_TEMP1[7:0]
RT2
RT1
Programmable
Temperature 1
E3
R/W 00
R/W 00
Programmable
Temperature 2
E4
FC
FD
FE
FF
PGM_TEMP2[7:0]
RSV
SOFT RESET
Vendor ID
ChipID
W
R
R
R
--
INIT
50
C3
2x
Vendor ID
ChipID
Version ID
Version ID (x=1,2,3…)
Feb, 2012
- 21 -
Version: 1.2
NCT7802Y
7.2
BANK 0 REGISTER DETAIL
7.2.1 Bank Select Register
Location : Index 00h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
2
2
2
1
1
1
1
0
NAME
FUNC.
RSV
BKSEL
BKSEL : Bank selection , 0=Bank0 , 1=Bank1
7.2.2 Remote Diode 1 Temperature Readout Register (MSB)
Location : Index 01h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
0
0
0
NAME
FUNC.
MNTRTD1[10:3]
MNTRTD1[10:3] : Readout of RTD1 High Byte
7.2.3 Remote Diode 2 Temperature Readout Register (MSB)
Location : Index 02h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
NAME
FUNC.
MNTRTD2[10:3]
MNTRTD2[10:3] : Readout of RTD2 High Byte
7.2.4 Remote Diode 3 Temperature Readout Register (MSB)
Location : Index 03h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
NAME
FUNC.
MNTRTD3[10:3]
MNTRTD3[10:3] : Readout of RTD3 High Byte
Feb, 2012
- 22 -
Version: 1.2
NCT7802Y
7.2.5 Local Diode Temperature Readout Register (MSB)
Location : Index 04h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
1
1
1
0
0
0
0
NAME
FUNC.
MNTLTD[7:0]
MNTLTD[7:0] : Readout of LTD Temperature
7.2.6 Temperature Readout Register (LSB)
Location : Index 05h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
NAME
FUNC.
MNTTD_LSB[2:0]
RSV
MNTTD_LSB[2:0] : Readout of TD Low Byte
7.2.7 PECI 0 Temperature Readout Register (MSB)
Location : Index 06h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
MNTPECI0[9:2]
MNTPECI0[9:2] : Readout of PECI0 High Byte
2
NAME
FUNC.
7.2.8 PECI 1 Temperature Readout Register (MSB)
Location : Index 07h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
NAME
FUNC.
MNTPECI1[9:2]
MNTPECI1[9:2] : Readout of PECI1 High Byte
Feb, 2012
- 23 -
Version: 1.2
NCT7802Y
7.2.9 Read PECI Temperature Readout Register (LSB)
Location : Index 08h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
0
0
0
NAME
FUNC.
MNTPECI_LSB[1:0]
MNTPECI_LSB[1:0] : Readout of PECI Low Byte
RSV
7.2.10 VCC Readout Register (MSB)
Location : Index 09h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
NAME
FUNC.
MNTVCC[9:2]
MNTVCC[9:2] : Readout of VCC High Byte
7.2.11 VCore Readout Register (MSB)
Location : Index 0Ah
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
NAME
FUNC.
MNTVCore[9:2]
MNTVCore[9:2] : Readout of VCore High Byte
7.2.12 VSEN1 Readout Register (MSB)
Location : Index 0Ch
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
NAME
FUNC.
MNTVSEN1[9:2]
MNTVSEN1[9:2] : Readout of VSEN1 High Byte
Feb, 2012
- 24 -
Version: 1.2
NCT7802Y
7.2.13 VSEN2 Readout Register (MSB)
Location : Index 0Dh
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
2
2
2
1
1
1
1
0
0
0
0
NAME
FUNC.
MNTVSEN2[9:2]
MNTVSEN2[9:2] : Readout of VSEN2 High Byte
7.2.14 VSEN3 Readout Register (MSB)
Location : Index 0Eh
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
NAME
FUNC.
MNTVSEN3[9:2]
MNTVSEN3[9:2] : Readout of VSEN3 High Byte
7.2.15 Voltage Readout Register (LSB)
Location : Index 0Fh
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
MNTV_LSB[1:0]
MNTV_LSB[1:0] : Readout of Voltage Low Byte
NAME
FUNC.
RSV
7.2.16 Fan Count 1 Readout Register (MSB)
Location : Index 10h
Type : Read Only
Power on default value : FFh
BIT
7
6
5
4
3
NAME
FUNC.
MNTFAN1[12:5]
MNTFAN1[12:5] : Readout of Fan Count 1 High Byte
Feb, 2012
- 25 -
Version: 1.2
NCT7802Y
7.2.17 Fan Count 2 Readout Register (MSB)
Location : Index 11h
Type : Read Only
Power on default value : FFh
BIT
7
6
5
4
3
2
2
2
2
1
0
0
0
0
NAME
FUNC.
MNTFAN2[12:5]
MNTFAN2[12:5] : Readout of Fan Count 2 High Byte
7.2.18 Fan Count 3 Readout Register (MSB)
Location : Index 12h
Type : Read Only
Power on default value : FFh
BIT
7
6
5
4
3
1
NAME
FUNC.
MNTFAN3[12:5]
MNTFAN3[12:5] : Readout of Fan Count 3 High Byte
7.2.19 Fan Count Readout Register (LSB)
Location : Index 13h
Type : Read Only
Power on default value : F8h
BIT
7
6
5
4
3
1
MNTFAN_LSB[4:0]
NAME
FUNC.
RSV
MNTFAN_LSB[4:0] : Readout of Fan Count Low Byte
7.2.20 MNTIMON Percent Register
Location : Index 15h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
1
NAME
FUNC.
MNTIMON_Percent
MNTIMON_Percent : IMON Percent, the voltage input is VCore (0.9V=100%)
Feb, 2012
- 26 -
Version: 1.2
NCT7802Y
7.2.21 Diode Fault Alert Status Register
Location : Index 17h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
STS_DF3 STS_DF2 STS_DF1
NAME
RSV
STS_DF3 : 1 indicates the TD3 fault
STS_DF2 : 1 indicates the TD2 fault
STS_DF1 : 1 indicates the TD1 fault
FUNC.
7.2.22 Temperature Low Alert Status Register
Location : Index 18h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
STS_PECI1 STS_PECI0 STS_AL4 STS_AL3 STS_AL2 STS_AL1
NAME
RSV
STS_PECI1 : 1 indicates the PECI1 over low limit
STS_PECI0 : 1 indicates the PECI0 over low limit
STS_AL4 : 1 indicates the LTD over low limit
STS_AL3 : 1 indicates the RTD3 over low limit
STS_AL2 : 1 indicates the RTD2 over low limit
STS_AL1 : 1 indicates the RTD1 over low limit
FUNC.
7.2.23 Temperature High Alert Status Register
Location : Index 19h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
STS_PE
CI1
STS_PE
CI0
STS_AH
4
STS_AH
3
STS_AH
2
STS_AH
1
NAME
RSV
STS_PECI1 : 1 indicates the PECI1 over high limit
STS_PECI0 : 1 indicates the PECI0 over high limit
STS_AH4 : 1 indicates the LTD over high limit
STS_AH3 : 1 indicates the RTD3 over high limit
STS_AH2 : 1 indicates the RTD2 over high limit
STS_AH1 : 1 indicates the RTD1 over high limit
FUNC.
Feb, 2012
- 27 -
Version: 1.2
NCT7802Y
7.2.24 Fan Alert Status Register
Location : Index 1Ah
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
FAN_TAR
3
FAN_TAR
2
FAN_TAR
1
RSV
RSV
FAN_FC3 FAN_FC2 FAN_FC1
NAME
FAN_TAR3 : 1 indicates the FAN3 is drived to fully speed over 3 minutes
FAN_TAR2 : 1 indicates the FAN2 is drived to fully speed over 3 minutes
FAN_TAR1 : 1 indicates the FAN1 is drived to fully speed over 3 minutes
FAN_FC3 : 1 indicates the FAN3 over limit.
FUNC.
FAN_FC2 : 1 indicates the FAN2 over limit
FAN_FC1 : 1 indicates the FAN1 over limit
7.2.25 T_CRIT# Alert Status Register
Location : Index 1Bh
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
STS_PE
CI1
STS_PE
CI0
STS_TC4 STS_TC3 STS_TC2 STS_TC1
NAME
RSV
STS_PECI1 : 1 indicates the PECI1 T_CRIT# asserts
STS_PECI0 : 1 indicates the PECI0 T_CRIT# asserts
STS_TC4 : 1 indicates the LTD T_CRIT# asserts
STS_TC3 : 1 indicates the RTD3 T_CRIT# asserts
STS_TC2 : 1 indicates the RTD2 T_CRIT# asserts
STS_TC1 : 1 indicates the RTD1 T_CRIT# asserts
FUNC.
7.2.26 GPIO Alert Status Register
Location : Index 1Ch
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
STS_GPIO STS_GPIO STS_GPIO STS_GPIO STS_GPIO STS_GPIO
NAME
RSV
6
5
4
3
2
1
STS_GPIO6 : 1 indicates the GPIO6 event asserts
STS_GPIO5 : 1 indicates the GPIO5 event asserts
STS_GPIO4 : 1 indicates the GPIO4 event asserts
STS_GPIO3 : 1 indicates the GPIO3 event asserts
STS_GPIO2 : 1 indicates the GPIO2 event asserts
STS_GPIO1 : 1 indicates the GPIO1 event asserts
FUNC.
Feb, 2012
- 28 -
Version: 1.2
NCT7802Y
7.2.27 Temperature SMI Status Register
Location : Index 1Dh
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
STS_PE
CI1
STS_PE
CI0
STS_LT
D4
STS_RT
D3
STS_RT
D2
STS_RT
D1
NAME
RSV
STS_PECI1 : 1 indicates the PECI1 SMI event asserts
STS_PECI0 : 1 indicates the PECI0 SMI event asserts
STS_LTD : 1 indicates the LTD SMI event asserts
STS_RTD3 : 1 indicates the RTD3 SMI event asserts
STS_RTD2 : 1 indicates the RTD2 SMI event asserts
STS_RTD1 : 1 indicates the RTD1 SMI event asserts
FUNC.
7.2.28 Voltage SMI Status Register
Location : Index 1Eh
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
STS_VCC
STS_VSEN3 STS_VSEN2 STS_VSEN1
NAME
STS_VCC : 1 indicates the VCC over limit
STS_VSEN3 : 1 indicates the VSEN3 over limit
STS_VSEN2 : 1 indicates the VSEN2 over limit
STS_VSEN1 : 1 indicates the VSEN1 over limit
FUNC.
7.2.29 Fan SMI Status Register
Location : Index 1Fh
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
FAN_TA
R3
FAN_TA
R2
FAN_TA
R1
FAN_FC
3
FAN_FC
2
FAN_FC
1
RSV
NAME
RSV
FAN_TAR3 : 1 indicates the FAN3 is drived to fully speed over 3 minutes
FAN_TAR3 : 1 indicates the FAN2 is drived to fully speed over 3 minutes
FAN_TAR3 : 1 indicates the FAN1 is drived to fully speed over 3 minutes
FAN_FC3 : 1 indicates the FAN3 over limit
FUNC.
FAN_FC2 : 1 indicates the FAN2 over limit
FAN_FC1 : 1 indicates the FAN1 over limit
Feb, 2012
- 29 -
Version: 1.2
NCT7802Y
7.2.30 T_CRIT# Real Time Status Register
Location : Index 20h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
LTD_Texc
RTD3_Texc RTD2_Texc RTD1_Texc
NAME
LTD_Texc : 1 indicates the LTD over the shutdown threshold
RTD3_Texc : 1 indicates the RTD3 over the shutdown threshold
RTD2_Texc : 1 indicates the RTD2 over the shutdown threshold
RTD1_Texc : 1 indicates the RTD1 over the shutdown threshold
FUNC.
7.2.31 Start Register
Location : Index 21h
Type : Read/Write
Power on default value : 01h
BIT
7
6
5
4
3
2
1
0
NAME
MSK_ALERT
RSV
START
MSK_ALERT : 1 indicates the ALERT# output is masked
START : 1 indicates the ADC is operating
FUNC.
7.2.32 Mode Selection Register
Location : Index 22h
Type : Read/Write
Power on default value : 7Fh
BIT
7
6
5
4
3
2
1
0
RSV
EnLTD
RTD3_MD
RTD2_MD
RTD1_MD
NAME
EnLTD : 1 indicates the LTD function enabled
RTD3_MD : 00=Closed , 01=Reserved , 10=Thermistor mode , 11=Voltage sense
RTD2_MD : 00=Closed , 01=Current mode , 10=Thermistor mode , 11=Voltage sense
RTD1_MD : 00=Closed , 01=Current mode , 10=Thermistor mode , 11=Voltage sense
FUNC.
7.2.33 PECI Enable Register
Location : Index 23h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
EnPECI1 EnPECI0
NAME
EnPECI1 : 1 indicates the PECI1 enabled
EnPECI0 : 1 indicates the PECI0 enabled
FUNC.
Feb, 2012
- 30 -
Version: 1.2
NCT7802Y
7.2.34 Fan Enable Register
Location : Index 24h
Type : Read/Write
Power on default value : 07h
BIT
7
6
5
4
3
2
1
0
RSV
EnFan3
EnFan2
EnFan1
NAME
EnFan3 : 1 indicates the FANIN3 enabled
EnFan2 : 1 indicates the FANIN2 enabled
EnFan1 : 1 indicates the FANIN1 enabled
FUNC.
7.2.35 Voltage Monitor Enable Register
Location : Index 25h
Type : Read/Write
Power on default value : 03h
BIT
7
6
5
4
3
2
1
0
RSV
EnVCore
EnVCC
NAME
EnVCore : 1 indicates the VCore enabled
EnVCC : 1 indicates the VCC enabled
FUNC.
7.2.36 Conversion Rate Register
Location : Index 26h
Type : Read/Write
Power on default value : 03h
BIT
7
6
5
4
3
2
1
0
RSV
ConvRate[1:0] : 00=1Hz , 01=2Hz , 10= 4Hz , 11=Free Run
ConvRate[1:0]
NAME
FUNC.
7.2.37 Fault Queue Register
Location : Index 27h
Type : Read/Write
Power on default value : 03h
BIT
7
6
5
4
3
2
1
0
RSV
FaultQueue[1:0]
NAME
FUNC.
FaultQueue[1:0] : Fault Queue of Thermal Shutdown , 00=1 , 01=2 , 10=3 , 11=4
Feb, 2012
Version: 1.2
- 31 -
NCT7802Y
7.2.38 Alert# High Limit Link to T_CRIT# Register
Location : Index 28h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
SYS3
SYS2
SYS1
NAME
SYS3 : 1 indicates the External Diode3 channel high limit will be linked to T_CRIT#
SYS2 : 1 indicates the External Diode2 channel high limit will be linked to T_CRIT#
SYS1 : 1 indicates the External Diode1 channel high limit will be linked to T_CRIT#
FUNC.
7.2.39 Reset Time Setting Register
Location : Index 29h
Type : Read/Write
Power on default value : 04h
BIT
7
6
5
4
3
2
1
0
RSV
SetResetTime
NAME
SetResetTime : 000=1ms , 001=12.5ms , 010=50ms , 011=100ms
FUNC.
100=200ms , 101=400ms , 110=800ms , 111=1600ms
7.2.40 Reset Limit Low Byte Register
Location : Index 2Ah
Type : Read/Write
Power on default value : EEh
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
ResetLimit[7:0]
ResetLimit[7:0] : Reset Limit Low Byte
7.2.41 Reset Limit High Byte Register
Location : Index 2Bh
Type : Read/Write
Power on default value : 80h
BIT
7
6
5
4
3
2
1
0
ResetLimit[9:8]
ResetLimit[9:8] : Reset Limit High Byte
NAME
FUNC.
RSV
The Reset voltage threshold formula = Vreset-thd / 0.004
For example, the Reset voltage shreshold is 3.0V, the registers setting will be:
3.0 / 0.004 = 750, the Index[2Bh]=80h, Index[2Ah]=EEh.
Feb, 2012
- 32 -
Version: 1.2
NCT7802Y
7.2.42 SMI# Control Register
Location : Index 2Fh
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
ALERT_
SMI_Sel
TCRIT_B
EEP_Sel
SMI_MO
D
TCRIT_M
OD
SMI_POL
En_SMI
TempSmiMode
NAME
ALERT_SMI_Sel : 0= ALERT , 1= SMI
TCRIT_BEEP_Sel : 0= TCRIT , 1= BEEP
SMI_MOD : 1= Level mode, 0= Pulse mode (Pulse width is 200uS)
SMI_POL : Refer to below table.
FUNC.
TCRIT_MOD : 0= Active low , 1= Active high
En_SMI : 0= Disable , 1= Enable SMI
TempSmiMode : 00= Comparator mode , 01= One time mode
10= Two times mode , 11= Two times mode
SMI_MD
SMI_POL
SMI#
0
0
1
1
0
1
0
1
Low pulse
High pulse
High level
Low level
7.2.43 RTD1 Temperature High Limit Register
Location : Index 30h
Type : Read/Write
Power on default value : 55h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
RTD1_HL
RTD1_HL : RTD1 Temperature High Limit setting for ALERT# and SMI#
7.2.44 RTD1 Temperature Low Limit Register
Location : Index 31h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
RTD1_LL
RTD1_LL : RTD1 Temperature Low Limit setting for ALERT# and SMI#
Feb, 2012
- 33 -
Version: 1.2
NCT7802Y
7.2.45 RTD2 Temperature High Limit Register
Location : Index 32h
Type : Read/Write
Power on default value : 55h
BIT
7
6
5
4
3
2
1
1
1
1
1
0
0
0
0
0
NAME
FUNC.
RTD2_HL
RTD2_HL : RTD2 Temperature High Limit setting for ALERT# and SMI#
7.2.46 RTD2 Temperature Low Limit Register
Location : Index 33h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
NAME
FUNC.
RTD2_LL
RTD2_LL : RTD2 Temperature Low Limit setting for ALERT# and SMI#
7.2.47 RTD3 Temperature High Limit Register
Location : Index 34h
Type : Read/Write
Power on default value : 55h
BIT
7
6
5
4
3
2
NAME
FUNC.
RTD3_HL
RTD3_HL : RTD3 Temperature High Limit setting for ALERT# and SMI#
7.2.48 RTD3 Temperature Low Limit Register
Location : Index 35h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
NAME
FUNC.
RTD3_LL
RTD3_LL : RTD3 Temperature Low Limit setting for ALERT# and SMI#
7.2.49 LTD Temperature High Limit Register
Location : Index 36h
Type : Read/Write
Power on default value : 55h
BIT
7
6
5
4
3
2
NAME
FUNC.
LTD_HL
LTD_HL : LTD Temperature High Limit setting for ALERT# and SMI#
Feb, 2012
- 34 -
Version: 1.2
NCT7802Y
7.2.50 LTD Temperature Low Limit Register
Location : Index 37h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
LTD_LL
LTD_LL : LTD Temperature Low Limit setting for ALERT# and SMI#
7.2.51 DTS Temperature High Limit Register
Location : Index 38h
Type : Read/Write
Power on default value : 55h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
DTS_HL
DTS_HL : DTS Temperature High Limit setting for ALERT# and SMI#
7.2.52 DTS Temperature Low Limit Register
Location : Index 39h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
DTS_LL
DTS_LL : DTS1 Temperature Low Limit setting for ALERT# and SMI#
7.2.53 RTD1 TCRIT Threshold Register
Location : Index 3Ah
Type : Read/Write
Power on default value : 64h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
TCRIT_RTD1
TCRIT_RTD1 : RTD1 Temperature Threshold of T_CRIT#
7.2.54 RTD2 TCRIT Threshold Register
Location : Index 3Bh
Type : Read/Write
Power on default value : 64h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
TCRIT_RTD2
TCRIT_RTD2 : RTD2 Temperature Threshold of T_CRIT#
Feb, 2012
- 35 -
Version: 1.2
NCT7802Y
7.2.55 RTD3 TCRIT Threshold Register
Location : Index 3Ch
Type : Read/Write
Power on default value : 64h
BIT
7
6
5
4
3
2
2
2
2
1
1
1
1
0
0
0
0
NAME
FUNC.
TCRIT_RTD3
TCRIT_RTD3 : RTD3 Temperature Threshold of T_CRIT#
7.2.56 LTD TCRIT Threshold Register
Location : Index 3Dh
Type : Read/Write
Power on default value : 64h
BIT
7
6
5
4
3
NAME
FUNC.
TCRIT_LTD
TCRIT_LTD : LTD Temperature Threshold of T_CRIT#
7.2.57 DTS TCRIT Threshold Register
Location : Index 3Eh
Type : Read/Write
Power on default value : 64h
BIT
7
6
5
4
3
NAME
FUNC.
TCRIT_DTS
TCRIT_DTS : DTS Temperature Threshold of T_CRIT#
7.2.58 VSEN1 High Limit Low Byte Register
Location : Index 3Fh
Type : Read/Write
Power on default value : FFh
BIT
7
6
5
4
3
NAME
FUNC.
VSEN1_HL[7:0]
VSEN1_HL : VSEN1 High Limit Low Byte
7.2.59 VSEN1 Low Limit Low Byte Register
Location : Index 40h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
VSEN1_LL[7:0]
VSEN1_LL : VSEN1 Low Limit Low Byte
Feb, 2012
- 36 -
Version: 1.2
NCT7802Y
7.2.60 VSEN2 High Limit Low Byte Register
Location : Index 41h
Type : Read/Write
Power on default value : FFh
BIT
7
6
5
4
3
2
2
2
2
2
1
1
1
1
1
0
0
0
0
0
NAME
FUNC.
VSEN2_HL[7:0]
VSEN2_HL : VSEN2 High Limit Low Byte
7.2.61 VSEN2 Low Limit Low Byte Register
Location : Index 42h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
NAME
FUNC.
VSEN2_LL[7:0]
VSEN2_LL : VSEN2 Low Limit Low Byte
7.2.62 VSEN3 High Limit Low Byte Register
Location : Index 43h
Type : Read/Write
Power on default value : FFh
BIT
7
6
5
4
3
NAME
FUNC.
VSEN3_HL[7:0]
VSEN3_HL : VSEN3 High Limit Low Byte
7.2.63 VSEN3 Low Limit Low Byte Register
Location : Index 44h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
NAME
FUNC.
VSEN3_LL[7:0]
VSEN3_LL : VSEN3 Low Limit Low Byte
7.2.64 VCC High Limit Low Byte Register
Location : Index 45h
Type : Read/Write
Power on default value : FFh
BIT
7
6
5
4
3
NAME
FUNC.
VCC_HL[7:0]
VCC_HL : VCC High Limit Low Byte
Feb, 2012
- 37 -
Version: 1.2
NCT7802Y
7.2.65 VCC Low Limit Low Byte Register
Location : Index 46h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
VCC_LL[7:0]
VCC_LL : VCC Low Limit Low Byte
7.2.66 VSEN Limit High Byte 1 Register
Location : Index 47h
Type : Read/Write
Power on default value : CCh
BIT
7
6
5
4
3
2
1
0
NAME
VSEN1_HL[9:8]
VSEN1_LL[9:8]
VSEN2_HL[9:8]
VSEN2_LL[9:8]
VSEN1_HL[9:8] : VSEN1 High Limit High Byte
VSEN1_LL[9:8] : VSEN1 Low Limit High Byte
VSEN2_HL[9:8] : VSEN2 High Limit High Byte
VSEN2_LL[9:8] : VSEN2 Low Limit High Byte
FUNC.
7.2.67 VSEN Limit High Byte 2 Register
Location : Index 48h
Type : Read/Write
Power on default value : CCh
BIT
7
6
5
4
3
2
1
0
NAME
VSEN3_HL[9:8]
VSEN3_LL[9:8]
VCC_HL[9:8]
VCC_LL[9:8]
VSEN3_HL[9:8] : VSEN3 High Limit High Byte
VSEN3_LL[9:8] : VSEN3 Low Limit High Byte
VCC_HL[9:8] : VCC High Limit High Byte
VCC_LL[9:8] : VCC Low Limit High Byte
FUNC.
7.2.68 FANIN1 Limit Low Byte Register
Location : Index 49h
Type : Read/Write
Power on default value : FFh
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
FANIN1_HL[7:0]
FANIN1_HL[7:0] : FANIN1 Limit Low Byte
Feb, 2012
- 38 -
Version: 1.2
NCT7802Y
7.2.69 FANIN2 Limit Low Byte Register
Location : Index 4Ah
Type : Read/Write
Power on default value : FFh
BIT
7
6
5
4
3
2
2
2
2
1
0
0
0
0
NAME
FUNC.
FANIN2_HL[7:0]
FANIN2_HL[7:0] : FANIN2 Limit Low Byte
7.2.70 FANIN3 Limit Low Byte Register
Location : Index 4Bh
Type : Read/Write
Power on default value : FFh
BIT
7
6
5
4
3
1
NAME
FUNC.
FANIN3_HL[7:0]
FANIN3_HL[7:0] : FANIN3 Limit Low Byte
7.2.71 FANIN1 Limit High Byte Register
Location : Index 4Ch
Type : Read/Write
Power on default value : F8h
BIT
7
6
5
4
3
1
NAME
FUNC.
FANIN1_HL[12:8]
RSV
FANIN1_HL[12:8] : FANIN1 Limit High Byte
7.2.72 FANIN2 Limit High Byte Register
Location : Index 4Dh
Type : Read/Write
Power on default value : F8h
BIT
7
6
5
4
3
1
NAME
FUNC.
FANIN2_HL[12:8]
RSV
FANIN2_HL[12:8] : FANIN2 Limit High Byte
Feb, 2012
- 39 -
Version: 1.2
NCT7802Y
7.2.73 FANIN3 Limit High Byte Register
Location : Index 4Eh
Type : Read/Write
Power on default value : F8h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
FANIN3_HL[12:8]
RSV
FANIN3_HL[12:8] : FANIN3 Limit High Byte
7.2.74 ALERT Mask Register Register
Location : Index 4Fh
Type : Read/Write
Power on default value : 7Fh
BIT
7
6
5
4
3
2
1
0
MSK_GP MSK_TA
IO RT
RSV
MSK_TC
MSK_FC MSK_AH MSK_AL
MSK_DF
NAME
MSK_TC : 1 indicates the ALERT# from T_CRIT event will be masked
MSK_GPIO : 1 indicates the ALERT# from GPIO event will be masked
MSK_TART : 1 indicates the ALERT# from TART event will be masked
MSK_FC : 1 indicates the ALERT# from FAN event will be masked
MSK_AH : 1 indicates the ALERT# from High ALERT event will be masked
MSK_AL : 1 indicates the ALERT# from Low ALERT event will be masked
MSK_DF : 1 indicates the ALERT# from Diode Fault event will be masked
FUNC.
7.2.75 ALERT/SMI Mask Temperature Channel Register
Location : Index 50h
Type : Read/Write
Power on default value : 3Fh
BIT
7
6
5
4
3
2
1
0
MSK_PE MSK_PE
CI1 CI0
MSK_LT
D
MSK_RT MSK_RT MSK_RT
RSV
NAME
D3
D2
D1
MSK_PECI1 : 1 indicates the ALERT#/SMI from PECI1 event will be masked
MSK_PECI0 : 1 indicates the ALERT#/SMI from PECI0 event will be masked
MSK_LTD : 1 indicates the ALERT#/SMI from LTD event will be masked
MSK_RTD3 : 1 indicates the ALERT#/SMI from RTD3 event will be masked
MSK_RTD2 : 1 indicates the ALERT#/SMI from RTD2 event will be masked
MSK_RTD1 : 1 indicates the ALERT#/SMI from RTD1 event will be masked
FUNC.
Feb, 2012
- 40 -
Version: 1.2
NCT7802Y
7.2.76 ALERT/SMI Mask Fan Channel Register
Location : Index 51h
Type : Read/Write
Power on default value : 07h
BIT
7
6
5
4
3
2
1
0
MSK_FA MSK_FA MSK_FA
N3 N2 N1
RSV
NAME
MSK_FAN3 : 1 indicates the ALERT#/SMI from FAN3/TART3 event will be masked
MSK_FAN2 : 1 indicates the ALERT#/SMI from FAN2/TART2 event will be masked
MSK_FAN1 : 1 indicates the ALERT#/SMI from FAN1/TART1 event will be masked
FUNC.
7.2.77 SMI Mask Voltage Channel Register
Location : Index 52h
Type : Read/Write
Power on default value : 8Fh
BIT
7
6
5
4
3
2
1
0
MSK_RE
SET
MSK_VC MSK_VS MSK_VS MSK_VS
EN3 EN2 EN1
RSV
NAME
C
MSK_RESET : 1 indicates the RESET# (Pin 6)output will be masked
MSK_VCC : 1 indicates the SMI from VCC event will be masked
MSK_VSEN3 : 1 indicates the SMI from VSEN3 event will be masked
MSK_VSEN2 : 1 indicates the SMI from VSEN2 event will be masked
MSK_VSEN1 : 1 indicates the SMI from VSEN1 event will be masked
FUNC.
7.2.78 T_CRIT# Mask Register
Location : Index 53h
Type : Read/Write
Power on default value : BFh
BIT
7
6
5
4
3
2
1
0
MSK_AL
L
MSK_PE MSK_PE
CI1 CI0
MSK_LT
D4
MSK_RT MSK_RT MSK_RT
RSV
NAME
D3
D2
D1
MSK_ALL : 1 indicates the T_CRIT# from ALL event will be masked
MSK_PECI1 : 1 indicates the T_CRIT# from PECI1 event will be masked
MSK_PECI0 : 1 indicates the T_CRIT# from PECI0 event will be masked
MSK_LTD : 1 indicates the T_CRIT# from LTD event will be masked
MSK_RTD3 : 1 indicates the T_CRIT# from RTD3 event will be masked
MSK_RTD2 : 1 indicates the T_CRIT# from RTD2 event will be masked
MSK_RTD1 : 1 indicates the T_CRIT# from RTD1 event will be masked
FUNC.
Feb, 2012
- 41 -
Version: 1.2
NCT7802Y
7.2.79 GPIO Alert Mask Register
Location : Index 54h
Type : Read/Write
Power on default value : 3Fh
BIT
7
6
5
4
3
2
1
0
MSK_GP MSK_GP MSK_GP MSK_GP MSK_GP MSK_GP
IO6 IO5 IO4 IO3 IO2 IO1
RSV
NAME
MSK_GPIO6 : 1 indicates the ALERT# from GPIO6 event will be masked
MSK_GPIO5 : 1 indicates the ALERT# from GPIO5 event will be masked
MSK_GPIO4 : 1 indicates the ALERT# from GPIO4 event will be masked
MSK_GPIO3 : 1 indicates the ALERT# from GPIO3 event will be masked
MSK_GPIO2 : 1 indicates the ALERT# from GPIO2 event will be masked
MSK_GPIO1 : 1 indicates the ALERT# from GPIO1 event will be masked
FUNC.
7.2.80 GPIO Enable Register
Location : Index 55h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
EnGPIO6 EnGPIO5 EnGPIO4 EnGPIO3 EnGPIO2 EnGPIO1
NAME
EnGPIO6 : 1 indicates the GPIO6 enabled
EnGPIO5 : 1 indicates the GPIO5 enabled
EnGPIO4 : 1 indicates the GPIO4 enabled
EnGPIO3 : 1 indicates the GPIO3 enabled
EnGPIO2 : 1 indicates the GPIO2 enabled
EnGPIO1 : 1 indicates the GPIO1 enabled
FUNC.
7.2.81 GPIO Mode Register
Location : Index 56h
Type : Read/Write
Power on default value : 3Fh
BIT
7
6
5
4
3
2
1
0
GPIO6
Mode
GPIO5
Mode
GPIO4
Mode
GPIO3
Mode
GPIO2
Mode
GPIO1
Mode
RSV
NAME
GPIO6 Mode : 0= Input , 1= Output
GPIO5 Mode : 0= Input , 1= Output
GPIO4 Mode : 0= Input , 1= Output
GPIO3 Mode : 0= Input , 1= Output
GPIO2 Mode : 0= Input , 1= Output
GPIO1 Mode : 0= Input , 1= Output
FUNC.
Feb, 2012
- 42 -
Version: 1.2
NCT7802Y
7.2.82 GPIO Output Type Register
Location : Index 57h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
GPIO6
OB
GPIO5
OB
GPIO4
OB
GPIO3
OB
GPIO2
OB
GPIO1
OB
RSV
NAME
GPIO6 Output Type : 0= Push Pull , 1= Open Drain
GPIO5 Output Type : 0= Push Pull , 1= Open Drain
GPIO4 Output Type : 0= Push Pull , 1= Open Drain
GPIO3 Output Type : 0= Push Pull , 1= Open Drain
GPIO2 Output Type : 0= Push Pull , 1= Open Drain
GPIO1 Output Type : 0= Push Pull , 1= Open Drain
FUNC.
7.2.83 GPIO Input Data Register
Location : Index 58h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
GPIO6 IN GPIO5 IN GPIO4 IN GPIO3 IN GPIO2 IN GPIO1 IN
NAME
GPIO6 IN : Input data register of GPIO6
GPIO5 IN : Input data register of GPIO5
GPIO4 IN : Input data register of GPIO4
GPIO3 IN : Input data register of GPIO3
GPIO2 IN : Input data register of GPIO2
GPIO1 IN : Input data register of GPIO1
FUNC.
7.2.84 GPIO Output Data Register
Location : Index 59h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
GPIO6
OUT
GPIO5
OUT
GPIO4
OUT
GPIO3
OUT
GPIO2
OUT
GPIO1
OUT
RSV
NAME
GPIO6 OUT : Output data register of GPIO6
GPIO5 OUT : Output data register of GPIO5
GPIO4 OUT : Output data register of GPIO4
GPIO3 OUT : Output data register of GPIO3
GPIO2 OUT : Output data register of GPIO2
GPIO1 OUT : Output data register of GPIO1
FUNC.
Feb, 2012
- 43 -
Version: 1.2
NCT7802Y
7.2.85 BEEP Voltage Channel Enable Register
Location : Index 5Ah
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
EnBP_R EnBP_V
ESET CC
EnBP_V
SEN3
EnBP_V
SEN2
EnBP_V
SEN1
RSV
NAME
EnBP_RESET : 1 indicates the BEEP is enabled for RESET event
EnBP_VCC : 1 indicates the BEEP is enabled for VCC event
EnBP_VSEN3 : 1 indicates the BEEP is enabled for VSEN3 event
EnBP_VSEN2 : 1 indicates the BEEP is enabled for VSEN2 event
EnBP_VSEN1 : 1 indicates the BEEP is enabled for VSEN1 event
FUNC.
7.2.86 BEEP Fan Channel Enable Register
Location : Index 5Bh
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
EnBP_FAN3
EnBP_FAN2
EnBP_FAN1
NAME
EnBP_FAN3 : 1 indicates the BEEP is enabled for FAN3 event
EnBP_FAN2 : 1 indicates the BEEP is enabled for FAN2 event
EnBP_FAN1 : 1 indicates the BEEP is enabled for FAN1 event
FUNC.
7.2.87 BEEP Temperature Channel Enable Register
Location : Index 5Ch
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
EnBP_P
ECI1
EnBP_P
ECI0
EnBP_L
TD
ENBP_R
TD3
EnBP_R
TD2
EnBP_R
TD1
RSV
NAME
EnBP_PECI1 : 1 indicates the BEEP is enabled for PECI1 event
EnBP_PECI0 : 1 indicates the BEEP is enabled for PECI0 event
EnBP_LTD : 1 indicates the BEEP is enabled for LTD event
EnBP_RTD3 : 1 indicates the BEEP is enabled for RTD3 event
EnBP_RTD2 : 1 indicates the BEEP is enabled for RTD2 event
EnBP_RTD1 : 1 indicates the BEEP is enabled for RTD1 event
FUNC.
Feb, 2012
- 44 -
Version: 1.2
NCT7802Y
7.2.88 BEEP Enable Register
Location : Index 5Dh
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
EnBP_SMI EnBP_DF EnBP_AL ENBP_AH EnBP_TC EnBP_En
NAME
EnBP_SMI : 1 indicates the BEEP is enabled for SMI# event
EnBP_DF : 1 indicates the BEEP is enabled for Diode Fault event
EnBP_AL : 1 indicates the BEEP is enabled for Low Alert event
EnBP_AH : 1 indicates the BEEP is enabled for High Alert event
EnBP_TC : 1 indicates the BEEP is enabled for T_CRIT# event
EnBP_En : 1 indicates the BEEP is enabled
FUNC.
7.2.89 Fan Control Output Type
Location : Index 5Eh
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
EnDCFAN2
EnDCFAN1
NAME
EnDCFAN2 : 0 indicates the FANCTL2 output is PWM type
1 indicates the FANCTL2 output is DC type
FUNC.
EnDCFAN1 : 0 indicates the FANCTL1 output is PWM type
1 indicates the FANCTL1 output is DC type
7.2.90 Fan Control Output Mode
Location : Index 5Fh
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
PWM3_P PWM2_P PWM1_P
OL OL OL
PWM3_O PWM2_O PWM1_O
RSV
RSV
NAME
D
D
D
PWM3_POL : 1 indicates the FANCTL3 PWM output is inverted
PWM2_POL : 1 indicates the FANCTL2 PWM output is inverted
PWM1_POL : 1 indicates the FANCTL1 PWM output is inverted
PWM3_OD : 0 indicates the FANCTL3 PWM output is push pull
1 indicates the FANCTL3 PWM output is open drain
FUNC.
PWM2_OD : 0 indicates the FANCTL2 PWM output is push pull
1 indicates the FANCTL2 PWM output is open drain
PWM1_OD : 0 indicates the FANCTL1 PWM output is push pull
1 indicates the FANCTL1 PWM output is open drain
Feb, 2012
- 45 -
Version: 1.2
NCT7802Y
7.2.91 Fan Control 1 Output Value
Location : Index 60h
Type : Read/Write for Manual mode , Read only for SMART FANTM IV control
Power on default value : 7FHEX.
BIT
7
6
5
4
3
2
1
1
1
0
0
0
FANDuty1
NAME
FUNC.
FANDuty1 : FANCTL1 output value
7.2.92 Fan Control 2 Output Value
Location : Index 61h
Type : Read/Write for Manual mode , Read only for SMART FANTM IV control
Power on default value : 7FHEX.
BIT
7
6
5
4
3
2
FANDuty2
NAME
FUNC.
FANDuty2 : FANCTL2 output value
7.2.93 Fan Control 3 Output Value
Location : Index 62h
Type : Read/Write for Manual mode , Read only for SMART FANTM IV control
Power on default value : 7FHEX.
BIT
7
6
5
4
3
2
FANDuty3
NAME
FUNC.
FANDuty3 : FANCTL3 output value
7.2.94 Close-Loop Fan Control RPM mode Register and Configure Register of PECI Error
(CRPE)
Location : Index 63h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
TwoDimension
RPM_HIGH_EN
NAME
PECIERR
TwoDimension : Close_Loop Fan Control Enable
Bit7 : 1 indicated the FAN3 group enables Close-Loop Fan Control RPM mode
Bit6 : 1 indicated the FAN2 group enables Close-Loop Fan Control RPM mode
Bit5 : 1 indicated the FAN1 group enables Close-Loop Fan Control RPM mode
RPM_HIGH_EN : Changing default unit of all RPM setting from 50 RPMs to 100 RPMs.
It benefits to control ultra high RPM fan
FUNC.
Bit4 : 1 indicated the FAN3 group support ultra high RPM fan
Bit3 : 1 indicated the FAN2 group support ultra high RPM fan
Bit2 : 1 indicated the FAN1 group support ultra high RPM fan
PECIERR : Refer the table 7-1 PECI Error Condition Table to fan output value
Feb, 2012
- 46 -
Version: 1.2
NCT7802Y
Table 7-1 PECI Error Condition Table
PECI ERROR CONDITION
BIT [1-0]
00BIN
Fan output value keeps at its current value
01BIN
Fan output value will be set to FOMV (Fan Output Min Value when PECI Error)
1xBIN
Fan output value will be set to the full speed value (FFh)
7.2.95 Temperature to Fan mapping Relationships Register
Location : Index 64h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
Temp2FanSelect
RSV
Temp1FanSelect
NAME
Temp2FanSelect , Temp1FanSelect : Enable FANCTL3 – FANCTL1 SMART FANTM IV
0 = FANCTL has no relation with this temperature source. FANCTL is controlled by
Manual mode (Default)
FUNC.
1 = Applies SMART FANTM IV control for SMART FANTM IV on FANCTL and this
temperature
7.2.96 Temperature to Fan mapping Relationships Register
Location : Index 65h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
Temp3FanSelect
NAME
Temp3FanSelect : Enable FANCTL3 – FANCTL1 SMART FANTM IV
0 = FANCTL has no relation with this temperature source. FANCTL is controlled by
Manual mode (Default)
FUNC.
1 = Applies SMART FANTM IV control for SMART FANTM IV on FANCTL and this
temperature
Feb, 2012
- 47 -
Version: 1.2
NCT7802Y
7.2.97 Fan Control Configuration Register 1
Location : Index 66h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
Temp2_Sh
are_En
Temp1_Sh
are_En
Temp2_Share_Sel
Temp1_Share_Sel
NAME
Temp2_Share_En : Enable temperature2 sharing table function
Temp2_Share_Sel : Select which temperature2 source could share control table in
SMART FANTM IV
FUNC.
Temp1_Share_En : Enable temperature1 sharing table function
Temp1_Share_Sel : Select which temperature1 source could share control table in
SMART FANTM IV
Refer to the Table 7-2 Sharing Table
Table 7-2 Sharing Table
BIT [2-0]
000BIN
SHARE_SEL CONDITION
Remote 1 temperature will be referred
001BIN
010BIN
011BIN
100BIN
101BIN
110BIN
111BIN
Remote 2 temperature will be referred
Remote 3 temperature will be referred
Local temperature will be referred
PECI Agent 0 temperature will be referred
PECI Agent 1 temperature will be referred
Programmable temperature 1 will be referred
Programmable temperature 2 will be referred
7.2.98 Fan Control Configuration Register 2
Location : Index 67h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
Temp3_Share_En
Temp3_Share_Sel
NAME
Temp3_Share_En : Enable temperature3 sharing table function
Temp3_Share_Sel : Select which temperature3 source could share control table in
FUNC.
SMART FANTM IV
Refer to the Table 7-2 Sharing Table
Feb, 2012
- 48 -
Version: 1.2
NCT7802Y
7.2.99 Fan Control Configuration Register 3
Location : Index 68h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
Temp2_Source_Sel
RSV
Temp1_Source_Sel
NAME
Temp2_Source_Sel : Temperature 2 source selection
Temp1_Source_Sel : Temperature 1 source selection
Refer to the Table 7-3 Source Table
FUNC.
Table 7-3 Source Table
BIT [2-0]
SOURCE_SEL CONDITION
Remote 1 temperature will be referred
000BIN
001BIN
010BIN
011BIN
100BIN
101BIN
110BIN
111BIN
Remote 2 temperature will be referred
Remote 3 temperature will be referred
Local temperature will be referred
PECI Agent 0 temperature will be referred
PECI Agent 1 temperature will be referred
Programmable temperature 1 will be referred
Programmable temperature 2 will be referred
7.2.100 Fan Control Configuration Register 4
Location : Index 69h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
Temp3_Source_Sel
NAME
Temp3_Source_Sel : Temperature 3 source selection
FUNC.
Refer to the Table 7-3 Source Table
7.2.101 Close-Loop Fan Control RPM mode Tolerance Register
Location : Index 6Dh
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
Generic_Tol_RPM
NAME
FUNC.
Generic_Tol_RPM : Tolerance of RPM mode, unit 50 RPM
Feb, 2012
- 49 -
Version: 1.2
NCT7802Y
7.2.102 FANCTL Step Up Time Register
Location : Index 6Eh
Type : Read/Write
Power on default value : 0Ah
BIT
7
6
5
4
3
2
1
0
UpTime
NAME
UpTime : In SMART FANTM IV mode, this register determines the amount of time
FANOUT takes to increase its value by one step
FUNC.
The units are intervals of 0.1 second. The default time is 1 second
7.2.103 FANCTL Step Down Time Register
Location : Index 6Fh
Type : Read/Write
Power on default value : 0Ah
BIT
7
6
5
4
3
2
1
0
DownTime
NAME
DownTime : In SMART FANTM IV mode, this register determines the amount of time
FANOUT takes to decrease its value by one step
FUNC.
The units are intervals of 0.1 second. The default time is 1 second
7.2.104 Default Fan Speed Register
Location : Index 70h
Type : Read/Write
Power on default value : 7Fh
BIT
7
6
5
4
3
2
1
0
DefaultFanSpeed
DefaultFanSpeed : Default Fan Speed at Power-on
NAME
FUNC.
7.2.105 FANCTL1 PWM Prescalar Register
Location : Index 71h
Type : Read/Write
Power on default value : 84h
BIT
7
6
5
4
3
2
1
0
CLKSEL
Divisor[6:0]
NAME
CKSEL : Clock source select
Divisor : Clock frequency Divisor
FUNC.
Refer the Table 7-4 Divisor table A & Table 7-5 Divisor table B
Feb, 2012
- 50 -
Version: 1.2
NCT7802Y
The clock source selected by CKSEL will be divided by the divisor and used as a fan PWM output
frequency.
If CKSEL equals 1, then the output clock is simply equal to 125/ (Divisor [6:0]+1) KHz
MappedDivisor depends on Divisor [6:0] and is described in the table below.
Table 7-4 Divisor Table A (CKSEL=1)
MAPPED
DIVISOR
OUTPUT
FREQUENCY
MAPPED
DIVISOR
OUTPUT
FREQUENCY
DIVISOR[6:0]
DIVISOR[6:0]
0000000
0000001
0000010
0000011
0000100
0000101
0000110
0000111
1
2
3
4
5
6
7
8
125KHz
62.5KHz
41.6KHz
31.2KHz
25KHz
RSV
0001111
0011111
0111111
1111111
16
32
7.8KHz
3.9KHz
1.9KHz
976Hz
20.8KHz
17.8KHz
15.6KHz
64
128
If CKSEL equals 0, then the output clock is simply equal to 1000/ Mapped Divisor Hz
MappedDivisor depends on Divisor [3:0] and is described in the table below.
Table 7-5 Divisor Table B (CKSEL=0)
MAPPED
DIVISOR
OUTPUT
FREQUENCY
MAPPED
DIVISOR
OUTPUT
FREQUENCY
DIVISOR[3:0]
DIVISOR[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1
2
3
4
5
6
7
8
1000Hz
500Hz
333Hz
250Hz
200Hz
166Hz
142Hz
125Hz
1000
1001
1010
1011
1100
1101
1110
1111
12
16
83Hz
62.5Hz
31.25Hz
15.6Hz
7.8Hz
32
64
128
256
512
1024
3.9Hz
1.9Hz
0.97Hz
7.2.106 FANCTL2 PWM Prescalar Register
Location : Index 72h
Type : Read/Write
Power on default value : 84h
BIT
7
6
5
4
3
2
1
0
NAME
CLKSEL
Divisor[6:0]
Feb, 2012
- 51 -
Version: 1.2
NCT7802Y
CKSEL : Clock source select
Divisor : Clock frequency Divisor
FUNC.
Refer the Table 7-4 Divisor table A & Table 7-5 Divisor table B
7.2.107 FANCTL3 PWM Prescalar Register
Location : Index 73h
Type : Read/Write
Power on default value : 84h
BIT
7
6
5
4
3
2
1
0
CLKSEL
Divisor[6:0]
NAME
CKSEL : Clock source select
Divisor : Clock frequency Divisor
FUNC.
Refer the Table 7-4 Divisor table A & Table 7-5 Divisor table B
7.2.108 Temp1 Hystersis Register
Location : Index 74h
Type : Read/Write
Power on default value : 53h
BIT
7
6
5
4
3
2
1
0
RSV
Criti_HysT1
RSV
Oper_HysT1
NAME
Criti_HysT1 : Hystersis value of SMART FANTM IV Critical Temperature
Oper_HysT1 : Hystersis value of SMART FANTM IV Operating Temperature
FUNC.
7.2.109 Temp2 Hystersis Register
Location : Index 75h
Type : Read/Write
Power on default value : 53h
BIT
7
6
5
4
3
2
1
0
RSV
Criti_HysT2
RSV
Oper_HysT2
NAME
Criti_HysT2 : Hystersis value of SMART FANTM IV Critical Temperature
Oper_HysT2 : Hystersis value of SMART FANTM IV Operating Temperature
FUNC.
7.2.110 Temp3 Hystersis Register
Location : Index 76h
Type : Read/Write
Power on default value : 53h
BIT
7
6
5
4
3
2
1
0
RSV
Criti_HysT3
RSV
Oper_HysT3
NAME
Criti_HysT3 : Hystersis value of SMART FANTM IV Critical Temperature
Oper_HysT3 : Hystersis value of SMART FANTM IV Operating Temperature
FUNC.
Feb, 2012
- 52 -
Version: 1.2
NCT7802Y
7.2.111FANCTL Start Duty Cycle Register
Location : Index 77h
Type : Read/Write
Power on default value :30h
BIT
7
6
5
4
3
2
1
0
StartDutyCycle
StartDutyCycle : control the FANCTL1-FANCTL3 fan output start-up value
NAME
FUNC.
7.2.112 FANCTL Stop Time Register
Location : Index 78h
Type : Read/Write
Power on default value : FFh
BIT
7
6
5
4
3
2
1
0
StopTime
NAME
StopTime : control the FANCTL1-FANCTL3 fan stop time
Unit in 0.1sec. Ranges from 0.1sec to 25.5 sec
If set to 0, the fan will never stop
FUNC.
7.2.113 NonStop Disable Register
Location : Index 79h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
RSV
NonStop_Fan3 NonStop_Fan2 NonStop_Fan1
NAME
NonStop_FAN3 : 1 indicates the FAN3 NonStop function disabled
NonStop_FAN2 : 1 indicates the FAN2 NonStop function disabled
NonStop_FAN1 : 1 indicates the FAN1 NonStop function disabled
FUNC.
7.2.114 Fan Output Min Value when PECI Error Register (FOMV)
Location : Index 7Ah
Type : Read/Write
Power on default value : 80h
BIT
7
6
5
4
3
2
1
0
NAME
MinDuty_PECIERR
MinDuty_PECIERR : control the FANCTL1-FANCTL3 fan output min value when PECI
error condition is occurred. Also see CRPE (Configure Register of PECI Error)
FUNC.
Feb, 2012
Version: 1.2
- 53 -
NCT7802Y
7.2.115Table 1 X-axis Transition Point 1 Register
Location : Index 80h
Type : Read/Write
Power on default value : 19h
BIT
7
6
5
4
3
2
1
1
1
1
0
0
0
0
Temp1Table_TR1
Temp1Table_TR1 : Temperature point 1 of SMART FANTM IV table 1
NAME
FUNC.
7.2.116 Table 1 X-axis Transition Point 2 Register
Location : Index 81h
Type : Read/Write
Power on default value : 23h
BIT
7
6
5
4
3
2
Temp1Table_TR2
Temp1Table_TR2 : Temperature point 2 of SMART FANTM IV table 1
NAME
FUNC.
7.2.117 Table 1 X-axis Transition Point 3 Register
Location : Index 82h
Type : Read/Write
Power on default value : 2Dh
BIT
7
6
5
4
3
2
Temp1Table_TR3
Temp1Table_TR3 : Temperature point 3 of SMART FANTM IV table 1
NAME
FUNC.
7.2.118 Table 1 X-axis Transition Point 4 Register
Location : Index 83h
Type : Read/Write
Power on default value : 37h
BIT
7
6
5
4
3
2
Temp1Table_TR4
Temp1Table_TR4 : Temperature point 4 of SMART FANTM IV table 1
NAME
FUNC.
Feb, 2012
- 54 -
Version: 1.2
NCT7802Y
7.2.119 Table 1 X-axis Critical Point Register
Location : Index 84h
Type : Read/Write
Power on default value : 3Ch
BIT
7
6
5
4
3
2
1
0
0
0
0
Temp1Table_TRCritical
Temp1Table_TRCritical : Critical Temperature point of SMART FANTM IV table 1
NAME
FUNC.
7.2.120 Table 1 Y-axis Transition Point 1 Register
Location : Index 85h
Type : Read/Write
Power on default value : 8Ch
BIT
7
6
5
4
3
2
1
1
1
Temp1Table_FL1
Temp1Table_FL1 : FANCTL point 1 of SMART FANTM IV table 1
NAME
FUNC.
7.2.121 Table 1 Y-axis Transition Point 2 Register
Location : Index 86h
Type : Read/Write
Power on default value : AAh
BIT
7
6
5
4
3
2
Temp1Table_FL2
Temp1Table_FL2 : FANCTL point 2 of SMART FANTM IV table 1
NAME
FUNC.
7.2.122 Table 1 Y-axis Transition Point 3 Register
Location : Index 87h
Type : Read/Write
Power on default value : C8h
BIT
7
6
5
4
3
2
Temp1Table_FL3
NAME
FUNC.
Temp1Table_FL3 : FANCTL point 3 of SMART FANTM IV table 1
Feb, 2012
- 55 -
Version: 1.2
NCT7802Y
7.2.123Table 1 Y-axis Transition Point 4 Register
Location : Index 88h
Type : Read/Write
Power on default value : E6h
BIT
7
6
5
4
3
2
1
1
1
1
0
0
0
0
Temp1Table_FL4
Temp1Table_FL4 : FANCTL point 4 of SMART FANTM IV table 1
NAME
FUNC.
7.2.124 Table 2 X-axis Transition Point 1 Register
Location : Index 90h
Type : Read/Write
Power on default value : 19h
BIT
7
6
5
4
3
2
Temp2Table_TR1
Temp2Table_TR1 : Temperature point 1 of SMART FANTM IV table 2
NAME
FUNC.
7.2.125Table 2 X-axis Transition Point 2 Register
Location : Index 91h
Type : Read/Write
Power on default value : 23h
BIT
7
6
5
4
3
2
Temp2Table_TR2
Temp2Table_TR2 : Temperature point 2 of SMART FANTM IV table 2
NAME
FUNC.
7.2.126 Table 2 X-axis Transition Point 3 Register
Location : Index 92h
Type : Read/Write
Power on default value : 2Dh
BIT
7
6
5
4
3
2
Temp2Table_TR3
Temp2Table_TR3 : Temperature point 3 of SMART FANTM IV table 2
NAME
FUNC.
Feb, 2012
- 56 -
Version: 1.2
NCT7802Y
7.2.127 Table 2 X-axis Transition Point 4 Register
Location : Index 93h
Type : Read/Write
Power on default value : 37h
BIT
7
6
5
4
3
2
1
0
Temp2Table_TR4
Temp2Table_TR4 : Temperature point 4 of SMART FANTM IV table 2
NAME
FUNC.
7.2.128 Table 2 X-axis Critical Point Register
Location : Index 94h
Type : Read/Write
Power on default value : 3Ch
BIT
7
6
5
4
3
2
1
0
0
0
Temp2Table_TRCritical
Temp2Table_TRCritical : Critical Temperature point of SMART FANTM IV table 2
NAME
FUNC.
7.2.129Table 2 Y-axis Transition Point 1 Register
Location : Index 95h
Type : Read/Write
Power on default value : 8Ch
BIT
7
6
5
4
3
2
1
Temp2Table_FL1
Temp2Table_FL1 : FANCTL point 1 of SMART FANTM IV table 2
NAME
FUNC.
7.2.130 Table 2 Y-axis Transition Point 2 Register
Location : Index 96h
Type : Read/Write
Power on default value : AAh
BIT
7
6
5
4
3
2
1
Temp2Table_FL2
NAME
FUNC.
Temp2Table_FL2 : FANCTL point 2 of SMART FANTM IV table 2
Feb, 2012
- 57 -
Version: 1.2
NCT7802Y
7.2.131 Table 2 Y-axis Transition Point 3 Register
Location : Index 97h
Type : Read/Write
Power on default value : C8h
BIT
7
6
5
4
3
2
1
0
Temp2Table_FL3
Temp2Table_FL3 : FANCTL point 3 of SMART FANTM IV table 2
NAME
FUNC.
7.2.132 Table 2 Y-axis Transition Point 4 Register
Location : Index 98h
Type : Read/Write
Power on default value : E6h
BIT
7
6
5
4
3
2
1
0
Temp2Table_FL4
Temp2Table_FL4 : FANCTL point 4 of SMART FANTM IV table 2
NAME
FUNC.
7.2.133 Table 3 X-axis Transition Point 1 Register
Location : Index A0h
Type : Read/Write
Power on default value : 19h
BIT
7
6
5
4
3
2
1
0
Temp3Table_TR1
Temp3Table_TR1 : Temperature point 1 of SMART FANTM IV table 3
NAME
FUNC.
7.2.134 Table 3 X-axis Transition Point 2 Register
Location : Index A1h
Type : Read/Write
Power on default value : 23h
BIT
7
6
5
4
3
2
1
0
Temp3Table_TR2
Temp3Table_TR2 : Temperature point 2 of SMART FANTM IV table 3
NAME
FUNC.
Feb, 2012
- 58 -
Version: 1.2
NCT7802Y
7.2.135 Table 3 X-axis Transition Point 3 Register
Location : Index A2h
Type : Read/Write
Power on default value : 2Dh
BIT
7
6
5
4
3
2
1
1
1
0
0
0
Temp3Table_TR3
Temp3Table_TR3 : Temperature point 3 of SMART FANTM IV table 3
NAME
FUNC.
7.2.136 Table 3 X-axis Transition Point 4 Register
Location : Index A3h
Type : Read/Write
Power on default value : 37h
BIT
7
6
5
4
3
2
Temp3Table_TR4
Temp3Table_TR4 : Temperature point 4 of SMART FANTM IV table 3
NAME
FUNC.
7.2.137 Table 3 X-axis Critical Point Register
Location : Index A4h
Type : Read/Write
Power on default value : 3Ch
BIT
7
6
5
4
3
2
Temp3Table_TRCritical
Temp3Table_TRCritical : Critical Temperature point of SMART FANTM IV table 3
NAME
FUNC.
7.2.138 Table 3 Y-axis Transition Point 1 Register
Location : Index A5h
Type : Read/Write
Power on default value : 8Ch
BIT
7
6
5
4
3
2
1
0
Temp3Table_FL1
NAME
FUNC.
Temp3Table_FL1 : FANCTL point 1 of SMART FANTM IV table 3
Feb, 2012
- 59 -
Version: 1.2
NCT7802Y
7.2.139 Table 3 Y-axis Transition Point 2 Register
Location : Index A6h
Type : Read/Write
Power on default value : AAh
BIT
7
6
5
4
3
2
1
1
1
0
0
0
Temp3Table_FL2
Temp3Table_FL2 : FANCTL point 2 of SMART FANTM IV table 3
NAME
FUNC.
7.2.140 Table 3 Y-axis Transition Point 3 Register
Location : Index A7h
Type : Read/Write
Power on default value : C8h
BIT
7
6
5
4
3
2
Temp3Table_FL3
Temp3Table_FL3 : FANCTL point 3 of SMART FANTM IV table 3
NAME
FUNC.
7.2.141Table 3 Y-axis Transition Point 4 Register
Location : Index A8h
Type : Read/Write
Power on default value : E6h
BIT
7
6
5
4
3
2
Temp3Table_FL4
Temp3Table_FL4 : FANCTL point 4 of SMART FANTM IV table 3
NAME
FUNC.
7.2.142 TD1 Offset Register
Location : Index C1h
Type : Read/Write
Power on default value : 3Dh
BIT
7
6
5
4
3
2
1
0
RSV
Offset_TD1 : TD1 function offset register
Offset_TD1
NAME
FUNC.
Feb, 2012
- 60 -
Version: 1.2
NCT7802Y
7.2.143 TD2 Offset Register
Location : Index C2h
Type : Read/Write
Power on default value : 3Dh
BIT
7
6
5
4
3
2
1
1
1
0
0
0
0
RSV
Offset_TD2 : TD2 function offset register
Offset_TD2
NAME
FUNC.
7.2.144 TR1 Offset Register
Location : Index C4h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
3
3
2
Offset_TR1
RSV
Offset_TR1 : TR1 function offset register
NAME
FUNC.
7.2.145 TR2 Offset Register
Location : Index C5h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
2
Offset_TR2
RSV
Offset_TR2 : TR2 function offset register
NAME
FUNC.
7.2.146 TR3 Offset Register
Location : Index C6h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
2
1
RSV
Offset_TR3 : TR3 function offset register
Offset_TR3
NAME
FUNC.
Feb, 2012
- 61 -
Version: 1.2
NCT7802Y
7.2.147Digital Filter Level Select Register
Location : Index CBh
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
LDT
RT3
RT2
RT1
NAME
00 : No filter selected. (Default)
01: Filter Level 1 selected.
10: Filter Level 2 selected.
11: Filter Level 3 selected.
FUNC.
Higher level will slow down the temperature sensor response.
7.2.148 Programmable Temperature 1 Register
Location : Index E3h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
PGM_TEMP1[7:0]
PGM_TEMP1[7:0] : Programmable Temperature 1
7.2.149 Programmable Temperature 2 Register
Location : Index E4h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
NAME
FUNC.
PGM_TEMP2[7:0]
PGM_TEMP2[7:0] : Programmable Temperature 2
7.2.150 Software Reset Register
Location : Index FCh
Type : Write Only
BIT
7
6
5
4
3
2
1
0
INIT
RSV
NAME
FUNC.
INIT : Write 1 to reset the NCT7802Y
Feb, 2012
- 62 -
Version: 1.2
NCT7802Y
7.2.151Vendor ID Register
Location : Index FDh
Type : Ready Only
Power on default value : 50h
BIT
7
6
5
4
3
2
1
0
VendorID
NAME
FUNC.
VendorID: Vendor ID of NCT7802Y
7.2.152 Chip ID Register
Location : Index FEh
Type : Ready Only
Power on default value : C3h
BIT
7
6
5
4
3
2
1
0
ChipID
NAME
FUNC.
ChipID: Chip ID of NCT7802Y
7.2.153 Version ID Register
Location : Index FFh
Type : Ready Only
Power on default value : 2xh
BIT
7
6
5
4
3
2
1
0
VersionID
NAME
FUNC.
VersionID: Versin ID of NCT7802Y, the value is 2xh (x=0,1,2…)
Feb, 2012
- 63 -
Version: 1.2
NCT7802Y
7.3 BANK 1 REGISTER MAP
Idx
Register Name
Att
R/W 00
RW 10 PECI_En
Df
7
6
5
4
3
2
1
0
0
Bank Select
RSV
RSV
BKSEL
Manual_E
n
1
PECI Control Reg-1
PECI Control Reg-2
PECI Control Reg-3
Report Temp Style 1
Routine_En
2
RW 00
RW 00
RW 00
RW 00
RSV
RSV
TN_Extend[1:0]
En_Agt[1:0]
Clamp
RSV
3
RSV
Dmn1_Agt[3:0]
4
RSV
RSV
RtDmn_Agt[1:0]
RtHigher
Address content for
manual command
Write Length for manual
command
Read Length for manual
command
Command Code for
manual command
Agent0 Base
5
Addr
6
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RW 00
RO F8
RO 80
RO F8
RO 80
RO F8
RO 80
RO F8
RO 80
Write_Length
Read_Length
7
8
Command_Code
Tbase0[6:0]
Tbase1[6:0]
WrData_1
9
RSV
RSV
Temperature
Agent1 Base
Temperature
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
Generic write in data 1 to
client
Generic write in data 2 to
client
Generic write in data 3 to
client
Generic write in data 4 to
client
Generic write in data 5 to
client
Generic write in data 6 to
client
Generic write in data 7 to
client
Generic write in data 8 to
client
Generic write in data 9 to
client
Generic write in data 10
to client
Generic write in data 11
to client
Generic write in data 12
to client
Agt0_D0 Relative Temp
(HB)
Agt0_D0 Relative Temp
(LB)
Agt0_D1 Relative Temp
(HB)
Agt0_D1 Relative Temp
(LB)
WrData_2
WrData_3
WrData_4
WrData_5
WrData_6
WrData_7
WrData_8
WrData_9
WrData_10
WrData_11
WrData_12
RTH_Agt0_D0
RTL_Agt0_D0
RTH_Agt0_D1
RTL_Agt0_D1
RTH_Agt1_D0
RTL_Agt1_D0
RTH_Agt1_D1
RTL_Agt1_D1
Agt1_D0 Relative Temp
(HB)
Agt1_D0 Relative Temp
(LB)
Agt1_D1 Relative Temp
(HB)
Agt1_D1 Relative Temp
(LB)
Feb, 2012
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Idx
1F
2A
2B
2C
2D
2E
2F
30
31
32
Register Name
Att
Df
7
6
5
4
3
2
1
0
Agent Characteristic
RO 00
RO 00
RO 00
RO 00
RO 00
RO 00
RO 00
RO 00
RO 00
RO 00
RSV
Alive_Agt[1:0]
Generic read out data 1
from client
Generic read out data 2
from client
Generic read out data 3
from client
Generic read out data 4
from client
Generic read out data 5
from client
Generic read out data 6
from client
Generic read out data 7
from client
Generic read out data 8
from client
RdData_1
RdData_2
RdData_3
RdData_4
RdData_5
RdData_6
RdData_7
RdData_8
RdData_9
Generic read out data 9
from client
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7.4 BANK 1 REGISTER DETAIL
7.4.1 PECI Control Register 1
Location : Index 01h
Type : Read/Write
Power on default value : 10h
BIT
7
READ / WRITE
R / W
DESCRIPTION
Enable PECI Function (PECI_En)
6~2
1
R / W
Reserved
R / W
Enable PECI Manual Command Function (Manual_En)
Enable PECI GetTemp Routine Function (Routine_En)
0
R / W
7.4.2 PECI Control Register 2
Location : Index 02h
Type : Read/Write
Power on default value : 00h
BIT
READ / WRITE
DESCRIPTION
7~6
R / W
Reserved
TN_Extend[1:0]
Adjust Transaction Rate
5
R / W
00BIN
01BIN
10BIN
11BIN
=
=
=
=
1.5 MHz
750 KHz
375 KHz
187.5 KHz
4
R / W
R / W
3 ~ 0
Reserved
7.4.3 PECI Control Register 3
Location : Index 03h
Type : Read/Write
Power on default value : 00h
BIT
READ / WRITE
DESCRIPTION
7 ~ 6
R / W
Reserved
En_Agt[1:0]
5
R / W
PECI host to process related agents enable or disable agent
PECI host to process related agents enable or disable agent0
Reserved
4
R / W
R / W
3 ~ 2
Dmn1_Agt[1:0]
1
R / W
Indicate which agent with domain1
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BIT
READ / WRITE
DESCRIPTION
0 = Agent does not have domain 1
0
R / W
1 = Agent has domain 1
(Do not set to 1 , if the CPU does not exist domain 1)
7.4.4 Report Temperature Style Register
Location : Index 04h
Type : Read/Write
Power on default value : 00h
BIT
READ / WRITE
DESCRIPTION
7 ~ 5
R / W
Reserved
When temperature data reading is positive or less than -128, can enable
this function to clamp temperature data.(Clamp)
4
R / W
3
2
R / W
R / W
Reserved
RtDmn_Agt[1:0]
Agent 1 - Agent 0 always return the relative domain Temperature
0 = Agent always returns the relative temperature from domain 0
1 = Agent always returns the relative temperature from domain 1
Return High Temperature of doamin0 or domain1.(RtHigher)
0 = The temperature of each agent is returned from domain 0 or domain 1,
1
R / W
0
R / W
which is controlled by (CR 04HEX
)
1 = Return the highest temperature in domain 0 and domain 1 of individual
Agent
7.4.5 Address Content for Manual Command Register
Location : Index 05h
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Command Address
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.6 Write Length for Manual Command Register
Location : Index 06h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
2
1
0
NAME
PECI Command Write Length
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DEFAULT
0
0
0
0
0
0
0
0
DESCRIPTION
The data would be sent to client
7.4.7 Read Length for Manual Command Register
Location : Index 07h
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
4
3
2
1
0
0
0
NAME
PECI Command Read Length
DEFAULT
DESCRIPTION
0
0
0
0
0
The data would be sent to client
7.4.8 Command Code for Manual Command Register
Location : Index 08h
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Command Code
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.9 Agent0 Base Temperature Register
Location : Index 09h
Type : Read/Write
Power on default value : 00h
BIT
7
Reserved
0
6
0
5
0
4
0
3
Tbase 0
0
2
0
1
0
0
NAME
DEFAULT
DESCRIPTION
0
The data would be sent to client
7.4.10 Agent1 Base Temperature Register
Location : Index 0Ah
Type : Read/Write
Power on default value : 00h
BIT
7
Reserved
0
6
0
5
0
4
0
3
Tbase 1
0
2
0
1
0
0
0
NAME
DEFAULT
DESCRIPTION
The data would be sent to client
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7.4.11 Generic Write in Data 1 to Client Register
Location : Index 0Bh
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 1
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.12 Generic Write in Data 2 to Client Register
Location : Index 0Ch
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 2
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.13 Generic Write in Data 3 to Client Register
Location : Index 0Dh
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 3
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.14 Generic Write in Data 4 to Client Register
Location : Index 0Eh
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 4
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
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7.4.15 Generic Write in Data 5 to Client Register
Location : Index 0Fh
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 5
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.16 Generic Write in Data 6 to Client Register
Location : Index 10h
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 6
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.17 Generic Write in Data 7 to Client Register
Location : Index 11h
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 7
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.18 Generic Write in Data 8 to Client Register
Location : Index 12h
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 8
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
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7.4.19 Generic Write in Data 9 to Client Register
Location : Index 13h
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 9
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.20 Generic Write in Data 10 to Client Register
Location : Index 14h
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 10
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.21 Generic Write in Data 11 to Client Register
Location : Index 15h
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 11
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
7.4.22 Generic Write in Data 12 to Client Register
Location : Index 16h
Type : Read/Write
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Write Data 12
DEFAULT
DESCRIPTION
0
0
0
The data would be sent to client
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7.4.23 Agent Relative Temperature Register
Location : Index 17h ~ 1Eh
Type : Read Only
Power on default value : F880h
These registers return the raw data retrieved from PECI GetTemp(). The data may be the error code
(range: 8000H~81FFH) or relative temperatures to process the defined Tbase. The error code will
only be update in ARTR and absolute Temperature will not be updated when the error code is
received. If the RtHigher mechanism is activated, the normal temperature will always be returned first.
In case both 2 domains return errors, the return priority will be Overflow Error > Underflow Error >
Missing Diode > General Error. The reset value is 8001HEX, in that PECI is defaulted to be off. In PECI,
8001HEX means the diode is missing.
INDEX 17-1E
DESCRIPTION
Domain0 Relative Temperature Agent0 [15:0]
Domain1 Relative Temperature Agent0 [15:0]
Domain0 Relative Temperature Agent1 [15:0]
Domain1 Relative Temperature Agent1 [15:0]
17h[15:8],18h[7:0]
19h[15:8],1Ah[7:0]
1Bh[15:8],1Ch[7:0]
1Dh[15:8],1Eh[7:0]
GetTemp() PECI Temperature format
BIT
DESCRIPTION
15
Sign Bit. (Sign) In PECI Protocol, this bit should always be 1 to represent a negative
temperature.
14-6
The integer part of the relative temperature. (Temperature[8:0])
TEMP_2. 0.5℃ unit.
5
4
3
2
1
0
TEMP_4. 0.25℃ unit.
TEMP_8. 0.125℃ unit.
TEMP_16. 0.0625℃ unit.
TEMP_32. 0.03125℃ unit.
TEMP_64. 0.015625℃ unit.
GetTemp() Response Definition
RESPONSE
MEANING
General Sensor Error
(GSE)
Thermal scan did not complete in time. Retry is appropriate.
Processor is running at its maximum temperature or is currently being
reset.
0x0000
Valid temperature reading, reported as a negative offset from the TCC
activation temperature.
All other data
The valide temperature reading is referred to GetTemp() PECI
Temperature format
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ERROR
CODE
DESCRIPTION
HOST OPERATION
8000HEX
8001HEX
General Sensor Error
No further processing.
Sensing Device Missing
Operational, but the
temperature is lower than the
sensor operation range.
Compulsorily write 0℃ back to the temperature
readouts.
8002HEX
8003HEX
Operational, but the
temperature is higher than the
sensor operation range.
Compulsorily write 127℃ back to the temperature
readouts.
8004HEX
~
Reserved
No further operation.
81FFHEX
7.4.24 Agent Characteristic Register
Location : Index 1Fh
Type : Read Only
Power on default value : 00h
BIT
7
6
0
5
0
4
0
3
0
2
0
1
0
NAME
RSV
PECI Alive Agent
DEFAULT
0
0
0
BIT
DESCRIPTION
7~2
1
Reserved
1: agent1 is able to respond to Ping() command. Agent alive
0: agent1 isn‟t able to respond to Ping() command. Agent is not alive
1: agent0 is able to respond to Ping() command. Agent alive
0: agent0 isn‟t able to respond to Ping() command. Agent is not alive
0
7.4.25 Generic Read Out Data 1 from Client Register
Location : Index 2Ah
Type : Read Only
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
NAME
PECI Read Data 1
DEFAULT
DESCRIPTION
0
0
0
0
The data would be got from client
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7.4.26 Generic Read Out Data 2 from Client Register
Location : Index 2Bh
Type : Read Only
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Read Data 2
DEFAULT
DESCRIPTION
0
0
0
The data would be got from client
7.4.27 Generic Read Out Data 3 from Client Register
Location : Index 2Ch
Type : Read Only
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Read Data 3
DEFAULT
DESCRIPTION
0
0
0
The data would be got from client
7.4.28 Generic Read Out Data 4 from Client Register
Location : Index 2Dh
Type : Read Only
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Read Data 4
DEFAULT
DESCRIPTION
0
0
0
The data would be got from client
7.4.29 Generic Read Out Data 5 from Client Register
Location : Index 2Eh
Type : Read Only
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Read Data 5
DEFAULT
DESCRIPTION
0
0
0
The data would be got from client
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7.4.30 Generic Read Out Data 6 from Client Register
Location : Index 2Fh
Type : Read Only
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Read Data 6
DEFAULT
DESCRIPTION
0
0
0
The data would be got from client
7.4.31 Generic Read Out Data 7 from Client Register
Location : Index 30h
Type : Read Only
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Read Data 7
DEFAULT
DESCRIPTION
0
0
0
The data would be got from client
7.4.32 Generic Read Out Data 8 from Client Register
Location : Index 31h
Type : Read Only
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Read Data 8
DEFAULT
DESCRIPTION
0
0
0
The data would be got from client
7.4.33 Generic Read Out Data 9 from Client Register
Location : Index 32h
Type : Read Only
Power on default value : 00h
BIT
7
6
0
5
0
4
3
2
0
1
0
0
0
NAME
PECI Read Data 9
DEFAULT
DESCRIPTION
0
0
0
The data would be got from client
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8. ELECTRICAL CHARACTERISTICS
8.1 Absolute Maximum Ratings
PARAMETER
Power Supply Voltage
Input Voltage
RATING
UNIT
V
3.3V 5%
-0.3 to +3.6
-40 to +85
-55 to +150
V
Operating Temperature
Storage Temperature
C
C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
of the device.
8.2 DC Characteristics
(Ta = 0 C to 70 C, VDD= 3.3V 5%, GND = 0V)
PARAMETER
OD12 – Open-drain output pin with source-sink capability of 12 mA, with 5V tolerance support.
Output Low Voltage VOL 0.4 IOL = 12 mA
OUT12 - Output buffer pin with source-sink capability of 12 mA, with 5V tolerance support.
SYM.
MIN.
TYP.
MAX.
UNIT
CONDITIONS
V
Output Low Voltage
Output High Voltage
VOL
VOH
0.4
V
V
IOL = 12 mA
IOH = -12 mA
2.4
INts - TTL level Schmitt-triggered input pin, with 5V tolerance support.
Input Low Voltage
Input High Voltage
Input High Leakage
Input Low Leakage
VIL
VIH
ILIH
ILIL
0.8
V
V
VDD = 3.3V
VDD = 3.3V
VIN=3.3V
VIN=0V
2.0
+10
-10
A
A
V1 – Bi-direction pin for INTELTM PECI
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
VIL
0.275Vtt
0.55Vtt
0.5Vtt
V
VIH
VOL
VOH
0.725Vtt
0.25Vtt
V
V
V
0.75Vtt
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8.3 AC Characteristics
SMBus Interface
PARAMETER
SCL clock period
SYMBOL
t-SCL
MIN.
2.5
1.5
1
MAX.
UNIT
uS
Start condition hold time
Stop condition setup-up time
DATA to SCL setup time
DATA to SCL hold time
SCL and SDA rise time
SCL and SDA fall time
tHD;SDA
tSU;STO
tSU;DAT
tHD;DAT
tR
uS
uS
120
5
nS
nS
1.0
uS
tF
300
nS
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9. ORDERING INFORMATION
PART NUMBER
PACKAGE
REMARKS
Green Package (Halogen-free)
QFN20
NCT7802Y
10. TOP MARKING SPECIFICATIONS
NCT7802Y
113TABA
1st Line : Nuvoton Logo
2nd Line : Part number- NCT7802Y
3rd Line : Assembly tracking code
1 13: packages made in year 2011, week 13
T : Assembly house code
A : IC version
BA : Nuvoton internal use code
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NCT7802Y
11. PACKAGE DRAWING AND DIMENSIONS
QFN20 4x4 MM2
TOP VIEW
BOTTOM VIEW
15
11
11
15
10
10
16
20
16
20
6
6
1
5
5
1
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12. REVISION HISTORY
VERSION
DATE
07/13/2011
1/5/2012
2/2/2012
PAGE
N.A.
2
DESCRIPTION
Public released, all versions before 1.0 are
preliminary versions.
1.0
1.1
Added VCC monitoring accuracy item.
Added
description.
Programming
from
EEPROM
1.2
7,16
Important Notice
Nuvoton Products are neither intended nor warranted for usage in systems or equipment, any
malfunction or failure of which may cause loss of human life, bodily injury or severe property
damage. Such applications are deemed, “Insecure Usage”.
Insecure usage includes, but is not limited to: equipment for surgical implementation, atomic
energy control instruments, airplane or spaceship instruments, the control or operation of
dynamic, brake or safety systems designed for vehicular use, traffic signal instruments, all
types of safety devices, and other applications intended to support or sustain life.
All Insecure Usage shall be made at customer’s risk, and in the event that third parties lay
claims to Nuvoton as a result of customer’s Insecure Usage, customer shall indemnify the
damages and liabilities thus incurred by Nuvoton.
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