TC650 [MICROCHIP]
Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert; 微型集成温度传感器和无刷直流风扇控制器具有超温报警型号: | TC650 |
厂家: | MICROCHIP |
描述: | Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert |
文件: | 总14页 (文件大小:441K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
TC650/TC651
Tiny Integrated Temperature Sensor & Brushless DC Fan
Controller with Over-Temperature Alert
Features
Package Type
• Integrated Temperature Sensing and Multi-speed
Fan Control
8-Pin MSOP
8-Pin SOIC
• Built-in Over Temperature Alert (T
)
OVER
V
8
PWM
DD
1
• Temperature Proportional Fan Speed Control for
Acoustic Noise Reduction and Longer Fan Life
NC
2
3
4
7 GND
6
TC650
TC651
• Pulse Width Modulation Output Drive for Cost and
Power Savings
SHDN
GND
T
OVER
5
NC
• Solid-State Temperature Sensing
• ±1°C (Typical) Accuracy from 25°C to +70°C
• 2.8V – 5.5V Operating Range
General Description
• TC651 includes Auto Fan Shutdown
• Low Operating Current: 50µA (Typical)
The TC650/TC651 are integrated temperature sensors
and brushless DC fan speed controllers. The TC650/
TC651 measure their junction temperature and control
the speed of the fan based on that temperature, making
them especially suited for applications in modern
electronic equipment.
Applications
• Thermal Protection For Personal Computers
• Digital Set-Top Boxes
• Notebook Computers
• Data Communications
• Power Supplies
Temperature data is converted from the on-chip
thermal sensing element and translated into
fractional fan speed from 40% to 100%. A temperature
selection guide in the data sheet is used to choose the
low and high temperature limits to control the fan. The
TC650/TC651 also include a single trip point over
a
• Projectors
Related Literature
temperature alert (T
) that eliminates the need for
OVER
additional temperature sensors. In addition, the TC651
features an auto fan shutdown function for additional
power savings.
• Application Note: AN771
Device Selection Table
The TC650/TC651 are easy to use, require no software
overhead and are therefore the ideal choice for
implementing thermal management in a variety of
systems.
Temperature
Range
Part Number
Package
TC650XXVUA 8-PinSOIC
TC651XXVUA 8-PinMSOP
-40°C to +125°C
-40°C to +125°C
X
Temperature
A
B
C
D
E
F
25
30
35
40
45
50
55
G
The "X" denotes
a suffix for temperature threshold settings.
Contact factory for other temperature ranges.
2002 Microchip Technology Inc.
DS21450B-page 1
TC650/TC651
Typical Application Diagram
+12V
+5V V
DD
DC Fan
500mA
TC650
TC651
V
8
1
2
3
4
DD
PWM
C
SLOW
NC
GND 7
T
6
OVER
SHDN
GND
NC
5
GND
GND
Over-Temp.
Alert
SHDN Control
µController
DS21450B-page 2
2002 Microchip Technology Inc.
TC650/TC651
*Stresses above those listed under "Absolute Maximum Rat-
ings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo-
sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage (V to GND) ...................................+6V
DD
Output Voltage (OUT to GND) ................................. 6V
Voltage On Any Pin....... (GND – 0.3V) to (V + 0.3V)
DD
Package Thermal Resistance (θ ) ..............250°C/W
JA
Operating Temperature Range ..........-40°C to +125°C
Storage Temperature ......................... -65°C to +150°C
TC650/TC651 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VDD = 2.8V to 5.5V, SHDN = VDD, TA = -40°C to 125°C unless otherwise specified.
Symbol
Parameter
Min
Typ.
Max
Units Test Conditions
VDD
IDD
Supply Voltage
Supply Current
2.8
—
—
5.5
90
V
50
µA
PWM, TOVER are open
SHDN Input
VIH
VIL
SHDN Input High Threshold
SHDN Input Low Threshold
65
—
—
—
—
%VDD
%VDD
15
PWM Output
VOL
VOH
tR
PWM Output Low Voltage
PWM Output High Voltage
PWM Rise Time
—
VDD - 0.5
—
—
—
10
0.3
—
V
V
ISINK = 1mA
ISOURCE = 5mA
—
µsec IOH = 5mA, 1nF from
PWM to GND
tF
PWM Fall Time
—
10
—
µsec IOL = 1mA, 1nF from
PWM to GND
fOUT
PWM Frequency
Start-up Time
10
—
15
—
—
Hz
tSTARTUP
32/fOUT
sec
VDD Rises from GND,
or SHDN Released
Temperature Accuracy
TH ACC
High Temperature Accuracy
TH – 3
-1.0
-2.5
—
TH
—
TH + 3
+1.0
+2.5
—
°C
°C
°C
°C
Note 1
(TH –TL) ACC Temp. Range Accuracy
(TH - TL) ≤ 20°C
(TH - TL) ≥ 20°C
TC651 Only
—
THYST
Auto-shutdown Hysteresis
(TH -TL)/5
TOVER Output
VHIGH
TOVER Output High Voltage
TOVER Output Low Voltage
Absolute Accuracy
VDD - 0.5
—
—
—
0.4
—
V
V
ISOURCE = 1.2mA
ISINK = 2.5mA
At Trip Point
VLOW
—
—
—
TOVER ACC
TOVER HYST
TH + 10
5
°C
°C
Trip Point Hysteresis
—
Note 1: Transition from 90% to 100% Duty Cycle.
2002 Microchip Technology Inc.
DS21450B-page 3
TC650/TC651
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No.
PIN FUNCTION TABLE
(8-Pin MSOP) Symbol
(8-Pin SOIC)
Description
1
2
3
V
Power Supply Input. May be independent of fan power supply.
No Internal Connect.
DD
NC
SHDN
Fan Shutdown, Active-Low Input. During Shutdown mode the chip still monitors temper-
ature and T
is low if temperature rises above factory set point.
OVER
4
5
6
7
8
GND
NC
Ground. Ground return for all TC650/TC651 functions.
No Connect.
T
Over-Temperature Alert, Active-Low Output.
Ground.
OVER
GND
PWM
PWM Fan Drive Output. Pulse width modulated rail-to-rail logic output. Nominal
Frequency is 15Hz.
DS21450B-page 4
2002 Microchip Technology Inc.
TC650/TC651
FIGURE 3-1:
FUNCTIONAL BLOCK
DIAGRAM
3.0
DETAILED DESCRIPTION
The TC650/TC651 acquire and convert their junction
V+
temperature (T ) information from an on-chip solid-state
V
DD
T
OVER
J
SHDN
sensor with a typical accuracy of ±1°C. The temperature
data is digitally stored in an internal register. The
register is compared with pre-defined threshold values.
The six threshold values are equally distributed over a
pre-defined range of temperatures (see Table 3-1 and
Table 3-2). The TC650/TC651 control the speed of a
DC brushless fan using a fractional speed control
scheme. The output stage requires only a 2N2222-type
small-signal BJT for fans up to 300mA. For larger
current fans (up to 1 Amp) a logic-level N-channel
MOSFET may be used. In addition to controlling the
speed of the fan, the TC650/TC651 include an on-chip
Duty Cycle
Logic
Control
Temperature
SetPointand
TrimRange
PWM
A/D Converter
Oscillator
Temperature Sensor
over-temperature alarm (T
when the temperature of the chip exceeds T by 10°C,
) that gives a low signal
OVER
3.1
PWM Output
H
(typical). This feature eliminates the need for a separate
temperature sensor for over-temperature monitoring.
The PWM pin is designed to drive a low cost transistor
or MOSFET as the low side power switching element in
the system. This output has an asymmetric
complementary drive and is optimized for driving NPN
transistors or N-channel MOSFETs. Since the system
relies on PWM rather than linear power control, the
dissipation in the power switch is kept to a minimum.
Generally, very small devices (TO-92 or SOT
packages) will suffice. The frequency of the PWM is
about 15Hz. The PWM is also the time base for the
Start-up Timer (see paragraphs below). The PWM duty
cycle has a range of 40% to 100% for the TC650 and
50% to 100% for the TC651.
TABLE 3-1:
TEMPERATURE RANGE
DEFINITION FOR TC650
(MINIMUM-SPEED MODE)
Temperature (T = T )
PWM Duty Cycle
J
T < T
40%
L
T < = T < T
50%
L
1
T < = T < T
60%
1
2
T < = T <T
70%
2
3
T < = T < T
80%
3
4
H
3.2
Start-Up Timer
T < = T < T
90%
100%
4
To ensure reliable fan start-up, the Start-up Timer turns
PWM high for about 2 seconds whenever the fan is
started from the off state. This occurs at power-up and
when coming out of Shutdown mode.
T
< = T < T
OV
H
T
< = T
100% with Over Temp Alert
OV
(T
= L)
OVER
3.3
Over-Temperature Alert (TOVER)
TABLE 3-2:
TEMPERATURE RANGE
DEFINITION FOR TC651
(AUTO-SHUTDOWN MODE)
This pin goes low when the T set point is exceeded by
H
o
10 C (typical). This indicates that the fan is at
maximum drive and the potential exists for system
overheating; either heat dissipation in the system has
gone beyond the cooling system's design limits, or
some FAULT exists such as fan bearing failure or an
airflow obstruction. This output may be treated as a
“System Overheat” warning and used to trigger system
shutdown, or bring other fans to full speed in the
system. The fan will continue to run at 100% speed
Temperature (T = T )
PWM Duty Cycle
J
T < T
“OFF”
L
T < = T < T
50%
L
1
T < = T < T
60%
1
2
T < =T < T
70%
2
3
T < =T < T
80%
3
4
while T
is asserted. Built-in hysteresis prevents
OVER
T < = T < T
90%
100%
4
H
T
from “chattering” when measured temperature
OVER
T
< = T < T
OV
H
is at or near the T + 10°C trip point. As temperature
H
falls through the T + 10°C trip point, hysteresis
T
< = T
100% with Over-Temp Alert
H
OV
maintains the
T
output low until measured
(T
= L)
OVER
OVER
temperature is 5°C above the trip point setting.
Note:The temperature regions defined by the six temperature thresh-
olds are pre-defined in the TC650/TC651 by means of trimming. Once
a TL and TH are programmed, the T1 – T4 thresholds are automatically
equally spaced between TL and TH.
2002 Microchip Technology Inc.
DS21450B-page 5
TC650/TC651
T and T can be selected in 5°C increments. T must
3.4
Shutdown (SHDN)
L
H
H
o
be chosen at least 10 C higher than T . T can range
L
L
The fan can be unconditionally shutdown by pulling low
the SHDN pin. During shutdown, the PWM output is
low. This is ideal for notebook computers and other
portable applications when you need to change
batteries and must not have the fan running at that
anywhere from 25°C to 35°C.
As an example, suppose you wanted the fan to run at
40% speed at 25°C or less and go to full speed at
45°C. You would order the part number TC650AEVUA.
time. Thermal monitoring and T
are still in
As another example, suppose you wanted the fan to
turn on at 30°C and go to full speed at 45°C. You
would order the part number TC651BEVUA.
OVER
operation during shutdown. I
shutdown current is
DD
around 50µA.
3.5
Auto-Shutdown Mode
The TC651 features auto-shutdown; when the
temperature is below the factory set point at minimum
speed (T ), PWM is low and the fan is automatically
L
shut off (Auto-shutdown mode). This feature is ideal for
notebook computers and other portable equipment that
need to conserve as much battery power as possible
and thus run a fan when it is only absolutely needed.
The TC651 will continue to be active so as to monitor
temperature for Tover. The TC651 exits Auto-shutdown
mode when the temperature rises above the factory set
point (T ).
1
3.6
Temperature Selection Guide
(Minimum Fan Speed/Full Speed)
The five temperature regions defined by the six
thresholds are defined in the TC650/TC651 by means
of factory trimming. Once a T and T are set, the T –
L
H
1
T
thresholds are automatically equally spaced
4
between T and T .
L
H
Temp.
Range
T
T
Part #
L
H
10°C
15°C
20°C
30°C
25
30
35
25
30
35
25
30
35
25
35
40
45
40
45
50
45
50
55
55
AC
BD
CE
AD
BE
CF
AE
BF
CG
AG
Note: The Bold Type temperature settings are available for
ordering. Contact factory for other temperature selec-
tions.
DS21450B-page 6
2002 Microchip Technology Inc.
TC650/TC651
4.0
4.1
TYPICAL APPLICATIONS
Reducing Switching Noise
For fans consuming more than 300mA, a slowdown
capacitor (C is recommended for reducing
)
SLOW
switching PWM induced noise (see Figure 4-1). The
value of this capacitor should be 4.7µF to 47µF,
depending on the fan current consumption.
See Application Note AN771 “Suppressing Acoustic
Noise in PWM Fan Speed Control Systems” for more
information.
FIGURE 4-1:
REDUCING SWITCHING
NOISE
+12V
+5V V
DD
DC Fan
TC650
TC651
500mA
V
8
1
2
3
4
DD
PWM
C
SLOW
NC
GND 7
T
6
OVER
SHDN
GND
NC
5
GND
GND
Over-Temp.
Alert
SHDN Control
µController
2002 Microchip Technology Inc.
DS21450B-page 7
TC650/TC651
5.0
TYPICAL CHARACTERISTICS
The graphs and tables provided following this note are a statistical summary based on a limited number of samples
and are provided for informational purposes only. The performance characteristics listed herein are not tested or
guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., out-
side specified power supply range) and therefore outside the warranted range
I
vs. Temperature
Temperature Accuracy vs. V
TH
3.0
DD
90
80
70
60
50
2.5
2.0
1.5
V
DD = 5.6
40
30
20
10
0
V
= 2.7
DD
1.0
0.5
0.0
V
= 5.6
V
DD
= 2.7
DD
-25
-50
0
25 50 75 100 125 150
T
T
T
T
H
T
T
3
1
4
2
L
T
TEMPERATURE (˚C)
THRESHOLD
PWM, I
1.0
vs. (V
DD
- V ), T = 25˚C
PWM, I
SINK
vs. V , T = 25˚C
OL
SOURCE
OH
A
A
500
0.9
0.8
0.7
450
400
350
V
= 2.8V
DD
V
= 2.8V
DD
0.6
0.5
0.4
0.3
0.2
0.1
300
250
200
150
V
= 5.5V
V
= 5.5V
DD
DD
100
50
0.0
0.0
0
2
4
6
8
10
14
18 20
16
12
0
6
8
1
2
3
4
5
7
9
10
I (mA)
SOURCE
I
(mA)
SINK
T
, I
vs. (V - V ), T = 25˚C
DD OH
A
OVER SOURCE
1.0
0.9
0.8
0.7
V
= 2.8V
DD
0.6
0.5
0.4
0.3
0.2
0.1
0.0
V
= 5.5V
DD
6
8
1
2
3
4
5
7
9
10
0
I
SOURCE (mA)
DS21450B-page 8
2002 Microchip Technology Inc.
TC650/TC651
6.0
6.1
PACKAGING INFORMATION
Package Marking Information
Package marking data not available at this time.
6.2
Taping Form
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
PIN 1
W
P
Standard Reel Component Orientation
for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
Component Taping Orientation for 8-Pin SOIC (Narrow) Devices
User Direction of Feed
PIN 1
W
P
Standard Reel Component Orientation
for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin SOIC (N)
12 mm
8 mm
2500
13 in
2002 Microchip Technology Inc.
DS21450B-page 9
TC650/TC651
6.3
Package Dimensions
8-Pin MSOP
PIN 1
.197 (5.00)
.189 (4.80)
.122 (3.10)
.114 (2.90)
.026 (0.65) TYP.
.122 (3.10)
.114 (2.90)
.043 (1.10)
MAX.
.008 (0.20)
.005 (0.13)
6° MAX.
.016 (0.40)
.010 (0.25)
.006 (0.15)
.002 (0.05)
.028 (0.70)
.016 (0.40)
Dimensions: inches (mm)
PIN 1
.157 (3.99)
.150 (3.81)
.244 (6.20)
.228 (5.79)
.050 (1.27) TYP.
.197 (5.00)
.189 (4.80)
.069 (1.75)
.053 (1.35)
.010 (0.25)
.007 (0.18)
8MAX.
.020 (0.51)
.013 (0.33)
.010 (0.25)
.004 (0.10)
.050 (1.27)
.016 (0.40)
Dimensions: inches (mm)
DS21450B-page 10
2002 Microchip Technology Inc.
TC650/TC651
SALES AND SUPPORT
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2002 Microchip Technology Inc.
DS21450B-page 11
TC650/TC651
NOTES:
DS21450B-page 12
2002 Microchip Technology Inc.
TC650/TC651
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
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dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
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and Mountain View, California in March 2002.
The Company’s quality system processes and
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2002 Microchip Technology Inc.
DS21450B-page 13
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Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: 949-263-1888 Fax: 949-263-1338
China - Shenzhen
Microchip Technology Consulting (Shanghai)
Co., Ltd., Shenzhen Liaison Office
Rm. 1315, 13/F, Shenzhen Kerry Centre,
Renminnan Lu
Shenzhen 518001, China
Tel: 86-755-2350361 Fax: 86-755-2366086
New York
150 Motor Parkway, Suite 202
Hauppauge, NY 11788
Tel: 631-273-5305 Fax: 631-273-5335
San Jose
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Tel: 408-436-7950 Fax: 408-436-7955
Toronto
Hong Kong
Italy
Microchip Technology Hongkong Ltd.
Unit 901-6, Tower 2, Metroplaza
223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: 852-2401-1200 Fax: 852-2401-3431
Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509
India
Tel: 39-039-65791-1 Fax: 39-039-6899883
United Kingdom
Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
Microchip Technology Inc.
India Liaison Office
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
03/01/02
DS21450B-page 14
2002 Microchip Technology Inc.
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