LTC4151CDD-PBF 概述
High Voltage I2C Current and Voltage Monitor 高电压I2C电流和电压监视器
LTC4151CDD-PBF 数据手册
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PDF下载LTC4151/LTC4151-1
2
High Voltage I C Current
and Voltage Monitor
FEATURES
DESCRIPTION
The LTC®4151 and LTC4151-1 are high side power
monitors that operate over a wide voltage range of 7V to
80V. In default operation mode, the onboard 12-bit ADC
continuously measures high side current, input voltage
n
Wide Operating Voltage Range: 7V to 80V
n
12-Bit Resolution for Both Current and Voltages
2
n
I C Interface
n
Additional ADC Input Monitors an External Voltage
2
n
Continuous Scan and Snapshot Modes
and an external voltage. Data is reported through the I C
n
Shutdown Mode (LTC4151) Reduces Quiescent
interface when polled by a host. The monitors can also
perform on-demand measurement in a snapshot mode.
The LTC4151 features a dedicated shutdown pin to reduce
Current to 120μA
n
Split SDA for Optoisolation (LTC4151-1)
2
n
Tiny 10-Lead MSOP and 3mm × 3mm DFN Packages
power consumption. The LTC4151-1 features split I C
data pins with data in and an inverted data output to drive
optoisolators.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIONS
n
Telecom Infrastructure
n
Automotive
n
Industrial
n
Consumer
12-Bit ADC DNL and INL
TYPICAL APPLICATION
1.0
High Side Power Sensing with Onboard ADC and I2C
0.5
0.02Ω
3.3V
V
IN
7V to 80V
0
V
OUT
+
–
SENSE SENSE
V
DD
2k
2k
–0.5
–1.0
V
IN
μCONTROLLER
SCL
SDA
SHDN
SCL
LTC4151
0
2048
3072
4096
1024
SDA
CODE
ADR1
ADR0
41511 TA01b
MEASURED
VOLTAGE
41511 TA01
1.0
0.5
ADIN
GND
0
–0.5
–1.0
0
2048
3072
4096
1024
CODE
41511 TA01c
41511fa
1
LTC4151/LTC4151-1
(Notes 1, 3)
ABSOLUTE MAXIMUM RATINGS
V Voltage.................................................–0.3V to 90V
Operating Temperature Range
IN
+
–
SENSE , SENSE Voltages.......................... V – 10V or
LTC4151C/LTC4151C-1............................ 0°C to 70°C
LTC4151I/LTC4151I-1 ..........................–40°C to 85°C
Storage Temperature Range
IN
–0.3V to V + 0.3V
IN
ADR1, ADR0 Voltages .............................. –0.3V to 90V
ADIN, SHDN, SDAO Voltages...................... –0.3V to 6V
SCL, SDA, SDAI Voltages (Note 2)........... –0.3V to 5.5V
SCL, SDA, SDAI Clamp Current .............................. 5mA
MSOP ................................................–65°C to 150°C
DFN....................................................–65°C to 125°C
Lead Temperature (Soldering, 10 sec)
MSOP Only ....................................................... 300°C
PIN CONFIGURATION
LTC4151
LT4151
TOP VIEW
+
–
TOP VIEW
SENSE
1
2
3
4
5
10 SENSE
+
–
SENSE
V
10
9
SENSE
GND
SHDN
SDA
SCL
1
2
3
4
5
V
9
8
7
6
GND
SHDN
SDA
SCL
IN
IN
ADR1
ADR0
ADIN
11
ADR1
ADR0
ADIN
8
7
6
MS PACKAGE
10-LEAD PLASTIC MSOP
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
T
JMAX
= 125°C, θ = 85°C/W
JA
T
= 125°C, θ = 45°C/W
JA
JMAX
EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL
LTC4151-1
LTC4151-1
TOP VIEW
+
–
TOP VIEW
SENSE
1
2
3
4
5
10 SENSE
+
–
SENSE
10
9
SENSE
GND
SDAO
SDAI
SCL
1
2
3
4
5
V
9
8
7
6
GND
SDAO
SDAI
SCL
IN
V
IN
11
ADR1
ADR0
ADIN
ADR1
ADR0
ADIN
8
7
6
MS PACKAGE
10-LEAD PLASTIC MSOP
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
T
JMAX
= 125°C, θ = 85°C/W
JA
T
= 125°C, θ = 45°C/W
JA
JMAX
EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL
41511fa
2
LTC4151/LTC4151-1
ORDER INFORMATION
LEAD FREE FINISH
LTC4151CDD#PBF
LTC4151IDD#PBF
LTC4151CDD-1#PBF
LTC4151IDD-1#PBF
LTC4151CMS#PBF
LTC4151IMS#PBF
LTC4151CMS-1#PBF
LTC4151IMS-1#PBF
TAPE AND REEL
PART MARKING*
LCWZ
PACKAGE DESCRIPTION
TEMPERATURE RANGE
0°C to 70°C
LTC4151CDD#TRPBF
LTC4151IDD#TRPBF
LTC4151CDD-1#TRPBF
LTC4151IDD-1#TRPBF
LTC4151CMS#TRPBF
LTC4151IMS#TRPBF
LTC4151CMS-1#TRPBF
LTC4151IMS-1#TRPBF
10-Lead (3mm x 3mm) Plastic DFN
10-Lead (3mm x 3mm) Plastic DFN
10-Lead (3mm x 3mm) Plastic DFN
10-Lead (3mm x 3mm) Plastic DFN
10-Lead Plastic MSOP
LCWZ
–40°C to 85°C
0°C to 70°C
LCXC
LCXC
–40°C to 85°C
0°C to 70°C
LTCWY
LTCWY
LTCXB
10-Lead Plastic MSOP
–40°C to 85°C
0°C to 70°C
10-Lead Plastic MSOP
LTCXB
10-Lead Plastic MSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN is from 7V to 80V, unless noted. (Note 3)
SYMBOL
General
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
V
Supply Voltage
Supply Current
7
80
V
IN
l
l
I
V
IN
V
IN
= 48V, Normal Operation Mode
= 12V, Shutdown Mode
1.2
120
1.7
300
mA
μA
IN
+
+
–
+
–
l
l
l
l
I
I
SENSE Input Current
V , SENSE , SENSE = 48V
5
9
1
μA
μA
V
SENSE
IN
–
+
–
SENSE Input Current
V , SENSE , SENSE = 48V
0.1
1.5
–5
SENSE
IN
V
SHDN Input Threshold
SHDN Input Current
1
2
SHDN(TH)
I
SHDN = 0V
–3
–8
μA
SHDN
ADC
l
RES
Resolution (No Missing Codes)
Full-Scale Voltage
(Note 4)
12
Bits
+
–
V
(SENSE – SENSE )
81.92
102.4
2.048
mV
V
V
FS
V
IN
ADIN
+
–
LSB
TUE
LSB Step Size
(SENSE – SENSE )
IN
20
25
0.5
μV
mV
mV
V
ADIN
(SENSE – SENSE )
(Note 5)
+
–
l
l
l
l
Total Unadjusted Error
1.25
1
0.75
1
%
%
%
%
V
IN
ADIN, LTC4151C, LTC4151C-1
ADIN, LTC4151I, LTC4151I-1
+
–
l
l
l
V
Offset Error
(SENSE – SENSE )
(Note 6)
5
6
8
LSB
LSB
LSB
OS
V
IN
ADIN
(SENSE – SENSE )
(Note 5)
+
–
l
l
l
INL
Integral Nonlinearity
1
1
0.5
3
3
2
LSB
LSB
LSB
V
IN
ADIN
41511fa
3
LTC4151/LTC4151-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN is from 7V to 80V, unless noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
+
–
Transition Noise
(SENSE – SENSE )
IN
ADIN
1.2
0.3
22
μV
mV
μV
RMS
RMS
RMS
σT
V
l
f
t
Conversion Rate (Continuous Mode)
Conversion Time (Snapshot Mode)
6
7.5
9
Hz
CONV
CONV
+
–
l
l
(SENSE – SENSE )
ADIN, V
53
26
67
33
85
42
ms
ms
IN
l
l
R
ADIN Pin Input Resistance
ADIN Pin Input Current
ADIN = 3V
ADIN = 3V
2
10
MΩ
ADIN
I
2
μA
ADIN
2
I C Interface
l
l
V
ADR0, ADR1 Input High Threshold
ADRO, ADRI Input Low Threshold
ADRO, ADRI Input Current
2.3
0.3
2.65
0.6
2.9
0.9
70
V
V
ADR(H)
V
ADR(L)
l
l
I
ADR0, ADR1 = 0V or 3V
ADR0, ADR1 = 0.8V or 2.2V
μA
μA
ADR(IN)
8
l
l
l
l
V
SDA, SDAO Output Low Voltage
SDA, SDAI, SDAO, SCL Input Current
SDA, SDAI, SCL Input Threshold
SDA, SDAI, SCL Clamp Voltage
I
, I = 8mA
0.15
0
0.4
2
V
μA
V
SDA(OL)
SDA SDAO
I
SDA, SDAI, SDAO, SCL = 5V
SDA,SCL(IN)
V
V
1.6
5.5
1.8
6.1
2
SDA,SCL(TH)
I
, I
, I
= 3mA
6.6
V
SDA,SCL(CL)
SDA SDAI SCL
2
I C Interface Timing (Note 4)
f
t
t
t
Maximum SCL Clock Frequency
Minimum SCL Low Period
Minimum SCL High Period
400
kHz
μs
SCL(MAX)
LOW
0.65
50
1.3
600
1.3
ns
HIGH
Minimum Bus Free Time Between Stop/
Start Condition
0.12
μs
BUF(MIN)
t
t
Minimum Hold Time After (Repeated)
Start Condition
140
30
600
600
ns
ns
HD,STA(MIN)
Minimum Repeated Start Condition
Set-Up Time
SU,STA(MIN)
t
t
t
t
t
Minimum Stop Condition Set-Up Time
Minimum Data Hold Time Input
Minimum Data Hold Time Output
Minimum Data Set-Up Time Input
30
–100
600
30
600
0
ns
ns
ns
ns
ns
SU,STO(MIN)
HD,DATI(MIN)
HD,DATO(MIN)
SU,DAT(MIN)
SP(MAX)
300
900
100
250
Maximum Suppressed Spike
Pulse Width
50
20
110
t
Stuck-Bus Reset Time
SCL or SDA/SDAI Held Low
33
5
ms
pF
RST
C
SCL, SDA Input Capacitance
10
X
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 3: All currents into pins are positive. All voltages are referenced to
GND, unless otherwise noted.
Note 4: Guaranteed by design and not subject to test.
Note 5: Integral nonlinearity and total unadjusted error of V are tested
IN
Note 2: Internal clamps limit the SCL, SDA (LTC4151) and SDAI
(LTC4151-1) pins to a minimum of 5.5V. Driving these pins to voltages
beyond the clamp may damage the part. The pins can be safely tied to
higher voltages through a resistor that limits the current below 5mA.
between 7V and 80V.
Note 6: Offset error of V is defined by extrapolating the straight line
measured between 7V and 80V.
IN
41511fa
4
LTC4151/LTC4151-1
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, TA = 25°C, unless noted.
Supply Current vs Supply Voltage
(Normal Mode)
Supply Current vs Supply Voltage
(Shutdown Mode)
1.30
1.15
1.00
0.85
0.70
400
300
200
100
0
–40°C
25°C
–40°C
25°C
85°C
85°C
40
60
0
80
20
40
SUPPLY VOLTAGE (V)
0
60
80
20
SUPPLY VOLTAGE (V)
41511 G01
41511 G02
ADC Total Unadjusted Error
vs Code (ADIN Voltage)
ADC DNL vs Code (ADIN Voltage)
ADC INL vs Code (ADIN Voltage)
0.10
0.05
0
1.0
0.5
1.0
0.5
0
0
–0.05
–0.10
–0.5
–1.0
–0.5
–1.0
2048
3072
2048
3072
0
4096
2048
0
4096
1024
0
3072
4096
1024
1024
CODE
CODE
CODE
41511 G03
41511 G05
41511 G04
ADC Total Unadjusted Error
vs Code (SENSE Voltage)
ADC DNL vs Code (SENSE Voltage)
ADC INL vs Code (SENSE Voltage)
1.0
0.5
2
1
2
1
0
0
0
–0.5
–1.0
–1
–2
–1
–2
2048
3072
0
4096
1024
2048
3072
2048
3072
0
4096
0
4096
1024
1024
CODE
CODE
CODE
41511 G06
41511 G07
41511 G08
41511fa
5
LTC4151/LTC4151-1
TYPICAL PERFORMANCE CHARACTERISTICS
SDA, SDAO Output Low vs
VIN = 12V, TA = 25°C, unless noted.
SDA, SDAI, SCL Clamp Voltage
vs Load Current
Pull-Up Current (VSDA(OL) vs ISDA
)
0.5
0.4
0.3
0.2
0.1
0
6.3
6.2
6.1
6.0
5.9
85°C
25°C
–40°C
–40°C
25°C
85°C
10
(mA)
15
0
20
5
0.01
0.1
1
10
I
I
(mA)
SDA
LOAD
41511 G09
41511 G10
PIN FUNCTIONS (DD/MS)
SENSE (Pin 1): Kelvin Sense of the V Pin. See Figure 10
for recommended Kelvin connection.
+
2
SDAI (Pin 7, LTC4151-1 Only): I C Bus Data Input. Used
for shifting in address, command or data bits. This pin is
drivenbyanopencollectoroutputfromamastercontroller.
An external pull-up resistor or current source is required
IN
V
(Pin 2): Supply Voltage Input. Accepts 7V to 80V.
IN
The voltage at this pin is monitored by the onboard ADC
and can be placed between SDAI and V . The voltage at
SDAI is internally clamped to 6V (5.5V minimum).
+
IN
with a full-scale input range of 102.4V. SENSE must be
connected to V for proper ADC readout.
IN
SDAO (Pin 8, LTC4151-1 Only): Inverted Serial Bus Data
Output.Open-drainoutputusedforsendingdatabacktothe
mastercontrolleroracknowledgingawriteoperation.Data
is inverted for convenience of optoisolation. An external
pull-up resistor or current source is required.
2
ADR1, ADR0 (Pin 3, Pin 4): I C Device Address Inputs.
ConnectingADR1andADR0toV ,GNDorleavingthepins
IN
openconfiguresoneofninepossibleaddresses.SeeTable1
in the Applications Information section for details.
ADIN(Pin5):ADCInput.TheonboardADCmeasuresvolt-
age range between 0V and 2.048V. Tie to GND if unused.
SHDN (Pin 8, LTC4151 Only): Shutdown Input. Internally
pulledupto6.3V.Pullthispinbelow1VtoforcetheLTC4151
into shutdown mode. Leave this pin open if unused.
2
SCL (Pin 6): I C Bus Clock Input. Data is shifted in and out
at the SDA pin on rising edges of SCL. This pin is driven
by an open collector output from a master controller. An
external pull-up resistor or current source is required and
GND (Pin 9): Device Ground.
–
SENSE (Pin 10): High Side Current Sense Input. Connect
+
–
can be placed between SCL and V . The voltage at SCL
is internally clamped to 6V (5.5V minimum).
an external sense resistor between SENSE and SENSE .
IN
+
–
The differential voltage between SENSE and SENSE is
monitored by the onboard ADC with a full-scale sense
voltage of 81.92mV.
2
SDA (Pin 7, LTC4151 Only): I C Bus Data Input/Output.
Used for shifting in address, command or data bits and
sending out data. An external pull-up resistor or current
Exposed Pad (Pin 11, DD Package Only): Exposed pad
may be left open or connected to device ground (GND).
sourceisrequiredandcanbeplacedbetweenSDAandV .
The voltage at SDA is internally clamped to 6V (5.5V
IN
minimum).
41511fa
6
LTC4151/LTC4151-1
BLOCK DIAGRAM
R
S
V
IN
2
1
10
8
3
4
+
–
V
IN
SENSE
SENSE
ADR1
ADR0
SHDN
(LTC4151)
6.3V
INTERNAL
POWER
5μA
+
–
25X
DECODER
SHUTDOWN
CONTROL
8
SDAO
(LTC4151-1)
V
REF
= 2.048V
735k
2
7
6
I C/
REGISTERS
SDA/SDAI
(LTC4151/
LTC4151-1)
12-BIT ADC
MUX
6V
6V
15k
SCL
GND
ADIN
9
5
41511 BD
OPERATION
TheLTC4151/LTC4151-1accuratelymonitorhighsidecur-
rent and voltages. These devices accept a wide range of
input voltages from as low as 7V up to 80V and consume
less than 1.7mA quiescent current in normal operation. A
shutdown mode is available with the LTC4151 to reduce
the quiescent current to less than 300μA by pulling the
SHDN pin below 1V.
In snapshot mode, the LTC4151/LTC4151-1 can perform
on-demand measurement of a selected voltage without
the need of continuous polling by a master controller. The
snapshot mode is enabled by programming the control
2
register through the I C interface. A status bit in the data
registermonitorstheADC’sconversion. Whentheconver-
sion is completed, the 12-bit digital code of the measured
voltage is held in the corresponding data registers.
In default continuous scan mode after power-up, the
onboard12-bitanalog-to-digitalconverter(ADC)continu-
2
The LTC4151/LTC4151-1 provide an I C interface to read
ously and sequentially measures the high side differen-
the ADC data from the data registers and to program the
control register. Two three-state pins, ADR0 and ADR1,
are used to decode nine device addresses (see Table 1).
The LTC4151 features a single SDA pin to handle both
input data and output data, while the LTC4151-1 provides
separate SDAI (input) and SDAO (inverted output) pins to
facilitate optoisolation.
+
tial voltage between SENSE (Kelvin sense of V ) and
IN
–
SENSE (full-scale 81.92mV) through an internal sense
amplifier, the input voltage V (full-scale 102.4V) through
IN
an internal voltage divider, and the voltage applied to the
ADIN pin (full-scale 2.048V). The reference voltage of the
ADC is internally set to 2.048V. The digital data obtained
by the ADC is stored in the onboard registers.
41511fa
7
LTC4151/LTC4151-1
APPLICATIONS INFORMATION
The LTC4151/LTC4151-1 offer a compact complete solu-
tionforhighsidepowermonitoring. Withawideoperating
voltage range from 7V to 80V, these devices are ideal for
a variety of applications including consumer, automotive,
industrial and telecom infrastructure. The simple applica-
tion circuit as shown in Figure 1 provides monitoring of
high side current with a 0.02Ω resistor (4.096A in full-
scale), input voltage (102.4V in full-scale) and an external
voltage (2.048V in full-scale), all with an internal 12-bit
resolution ADC.
The 12-bit digital code of each measured voltage is stored
in two adjacent registers out of the six total data registers
A through F, with the eight MSBs in the first register and
the four LSBs in the second (Table 2).
ThedatainregistersAthroughFisrefreshedatafrequency
of7.5Hzincontinuousscanmode. Settingcontrolregister
bit G4 (Table 6) invokes a test mode that halts updating
of these registers so that they can be written to and read
from for software testing.
The data converter features a snapshot mode allowing us-
ers to make one-time measurements of a selected voltage
Data Converter
(either the SENSE voltage, V voltage, or ADIN voltage).
IN
TheLTC4151/LTC4151-1featureanonboard,12-bitanalog-
to-digitalconverter(ADC)thatcontinuouslymonitorsthree
To enable snapshot mode, set control register bit G7 and
write the two-bit code of the desired ADC channel to G6
and G5 (Table 6) using a Write Byte command. When the
Write Byte command is completed, the ADC measures the
selected voltage and a Busy Bit in the LSB data register
is set to indicate that the data is not ready. After complet-
ing the conversion, the ADC is halted and the Busy Bit is
reset to indicate that the data is ready. To make another
measurement of the same voltage or to measure another
voltage, first disable the snapshot mode for the previous
measurementbyclearingcontrolbitG7,thenre-enablethe
snapshot mode and write the code of the desired voltage
according to the procedure described above.
–
voltages in the sequence of (V
– V
) first, V
+
SENSE
SENSE IN
second and V
third. The differential voltage between
ADIN
+
–
SENSE and SENSE is monitored with an 81.92mV full-
scale and 20μV resolution that allows accurate measure-
ment of the high side input current. SENSE is a Kelvin
+
sense pin for the V pin and must be connected to V
IN
IN
(see Figure 10) for proper ADC readout. The supply volt-
age at V is directly measured with a 102.4V full-scale
IN
and 25mV resolution. The voltage at the uncommitted
ADIN pin is measured with a 2.048V full-scale and 0.5mV
resolution that allows monitoring of any external voltage.
0.02Ω
3.3V
V
IN
V
OUT
7V TO 80V
1
10
+
–
SENSE
SENSE
V
DD
2k
2k
2
V
IN
8
6
7
μ-Controller
SCL
SDA
SHDN
LTC4151
SCL
SDA
3
4
ADR1
ADR0
5
41511 F01
ADIN
V
ADIN
GND
9
Figure 1. Monitoring High Side Current and Voltages Using the LTC4151
41511fa
8
LTC4151/LTC4151-1
APPLICATIONS INFORMATION
I C Interface
2
the Read Page and Write Page commands, the host need
only to issue an initial register address and the internal
register address pointer automatically increments by 1
after each byte of data is read or written. After the register
address reaches 06h, it will be reset to 00h and continue
theincrement.UponaStopcondition,theregisteraddress
is reset to 00h. If desired, the Read Page and Write Page
support can be disabled by clearing control register bit
G3. The data formats for the above commands are shown
in Figures 3 to 8.
2
The LTC4151/LTC4151-1 feature an I C-compatible in-
terface to provide access to six ADC data registers and
a control register for monitoring the measured voltages.
Figure 2 shows a general data transfer format using the
2
I C. The LTC4151 and LTC4151-1 are read-write slave
devices and support SMBus Read Byte, Write Byte, Read
Word and Write Word commands. The devices also sup-
port Read Page and Write Page commands that allow one
to read or write more than two bytes of data. When using
SDA
SCL
a6 - a0
1 - 7
b7 - b0
b7 - b0
8
9
1 - 7
8
9
1 - 7
8
9
S
P
START
CONDITION
ADDRESS
R/W
ACK
DATA
ACK
DATA
ACK
STOP
CONDITION
41511 F02
Figure 2. General Data Transfer over I2C
S
ADDRESS W A
1 1 0 a3:a0
COMMAND
A
DATA
b7:b0
A
P
S
ADDRESS W A
1 1 0 a3:a0
COMMAND
A
DATA
b7:b0
A
DATA
A
P
0
0
X X X X X b2:b0
0
0
b7:b0
0
0
0
X X X X X b2:b0
0
0
41511 F03
41511 F04
FROM MASTER TO SLAVE
FROM SLAVE TO MASTER
A: ACKNOWLEDGE (LOW)
A: NOT ACKNOWLEDGE (HIGH) S: START CONDITION
R: READ BIT (HIGH) P: STOP CONDITION
W: WRITE BIT (LOW)
Figure 4. LTC4151 Serial Bus SDA Write Word Protocol
Figure 3. LTC4151 Serial Bus SDA Write Byte Protocol
S
ADDRESS W A
1 1 0 a3:a0
COMMAND
A
DATA
A
DATA
A
...
DATA
A
P
S
ADDRESS W A
1 1 0 a3:a0
COMMAND
A
S
ADDRESS
R
A
DATA
A
P
0
0
X X X X X b2:b0
0
b7:b0
0
b7:b0
0
...
b7:b0
0
0
0
X X X X X b2:b0
0
1 1 0 a3:a0
1
0
b7:b0
1
41511 F05
41511 F06
Figure 5. LTC4151 Serial Bus SDA Write Page Protocol
Figure 6. LTC4151 Serial Bus SDA Read Byte Protocol
S
ADDRESS W A
1 1 0 a3:a0
COMMAND
A
S
ADDRESS
R
A
DATA
A
DATA
A
P
0
0
X X X X X b2:b0
0
1 1 0 a3:a0
1
0
b7:b0
0
b7:b0
1
41511 F07
Figure 7. LTC4151 Serial Bus SDA Read Word Protocol
S
ADDRESS W A
1 1 0 a3:a0
COMMAND
A
S
ADDRESS
R
A
DATA
A
DATA
...
DATA
A
P
0
0
X X X X X b2:b0
0
1 1 0 a3:a0
1
0
b7:b0
0
b7:b0
...
b7:b0
1
41511 F08
Figure 8. LTC4151 Serial Bus SDA Read Page Protocol
41511fa
9
LTC4151/LTC4151-1
APPLICATIONS INFORMATION
Using Optoisolators with LTC4151-1
Stuck-Bus Reset
2
The LTC4151-1 splits the SDA line into SDAI (input)
and SDAO (inverted output) for convenience of opto-
coupling with a host controller that sits at a differ-
ent ground level. When using optoisolators with the
LTC4151-1, connect the SDAI to the output of the
incoming optocoupler and connect the SDAO to the anode
of the outgoing optocoupler (see Figure 9). With the
outgoing optocoupler clamping SDAO and internal 6V
(5.5V minimum) clamps on SDAI and SCL, the pull-up
resistors on these three pins can be directly connected
The LTC4151/LTC4151-1 I C interface features a stuck-
bus reset timer. The low conditions of the SCL and the
SDA/SDAI pins are OR’ed to start the timer. The timer is
reset when both SCL and SDA/SDAI are pulled high. If the
SCL pin or the SDA/SDAI pin is held low for over 33ms,
2
the stuck-bus timer will expire and the internal I C state
machinewillberesettoallownormalcommunicationafter
the stuck-bus condition is cleared. The stuck-bus timer
can be disabled by clearing control register bit G2.
2
I C Device Addressing
to V . In this way (with SDAO rather than conventional
IN
2
SDAO), the need for a separate low voltage supply for
pull-ups is eliminated.
Nine distinct I C bus addresses are configurable us-
ing the three-state pins ADR0 and ADR1, as shown in
Table 1. Address bits a6, a5 and a4 are configured to
(110) and the least significant bit is the R/W bit. In addi-
tion, the LTC4151 and LTC4151-1 will respond to a mass
write address (1100 110)b for writing to all LTC4151s
and LTC4151-1s, regardless of their individual address
settings.
Start and Stop Conditions
2
When the I C bus is idle, both SCL and SDA must remain
in the high state. A bus master signals the beginning of a
transmission with a Start condition by transitioning SDA
from high to low while SCL stays high. When the master
has finished communicating with the slave, it issues a
Stop condition by transitioning SDA from low to high
while SCL stays high. The bus is then free for another
transmission.
R
S
3.3V
0.02Ω
V
IN
48V
R1
20k
R2
20k
R3
5.1k
R5
R6 R7
10k 10k
R4
1
10
0.51k 0.51k
MOCD207M
+
–
SENSE
SENSE
6
8
1
SCL
2
V
IN
7
6
2
3
V
DD
SCL
7
8
LTC4151-1
SDAI
SDA0
ADIN
3
4
μ-Controller
ADR1
ADR0
5
1
4
8
5
V
ADIN
MOCD207M
SDA
GND
9
41511 F09
2
3
7
6
4
5
Figure 9. Optoisolation of the I2C Interface Between LTC4151-1 and a Microcontroller
41511fa
10
LTC4151/LTC4151-1
APPLICATIONS INFORMATION
Acknowledge
into its internal register. If the master continues sending a
secondbyteormoredatabytes,asinaWriteWordorWrite
Page command, the second byte or more data bytes will
be acknowledged by the LTC4151/LTC4151-1, the internal
register address pointer will increment automatically, and
each byte of data will be latched into an internal register
corresponding to the address pointer. The write operation
terminates and the register address pointer resets to 00h
when the master sends a Stop condition.
The acknowledge signal is used for handshaking between
the transmitter and the receiver to indicate that the last
byte of data was received. The transmitter always releases
the SDA line during the acknowledge clock pulse. The
LTC4151/LTC4151-1 pull the SDA line low on the 9th clock
cycle to acknowledge receipt of the data. If the slave fails
to acknowledge by leaving SDA high, then the master can
abort the transmission by generating a Stop condition.
When the master is receiving data from the slave, the
master mustpulldowntheSDAlineduring the clock pulse
to indicate receipt of a data byte, and that another byte is
to be read. After the last byte has been received the master
will leave the SDA line high (not acknowledge) and issue
a Stop condition to terminate the transmission.
Read Protocol
The master begins a read operation with a Start condition
followedbythesevenbitslaveaddressandtheR/Wbitsetto
zero.AftertheaddressedLTC4151/LTC4151-1acknowledge
the address byte, the master then sends a command byte
that indicates which internal register the master wishes to
read. The LTC4151/LTC4151-1 acknowledge this and then
latches the lower three bits of the command byte into its
internal register address pointer. The master then sends
a repeated Start condition followed by the same seven bit
address with the R/W bit now set to one. The LTC4151/
LTC4151-1 acknowledge and send the contents of the
requested register. The transmission terminates when the
mastersendsaStopcondition.Ifthemasteracknowledges
the transmitted data byte, as in a Read Word command,
the LTC4151/LTC4151-1 will send the contents of the next
register. If the master acknowledges the second data byte
Write Protocol
The master begins a write operation with a Start condi-
tion followed by the seven bit slave address and the R/W
bit set to zero. After the addressed LTC4151/LTC4151-1
acknowledge the address byte, the master then sends a
command byte which indicates which internal register
the master wishes to write. The LTC4151/LTC4151-1
acknowledge this and then latches the lower three bits of
thecommandbyteintoitsinternalregisteraddresspointer.
The master then delivers the data byte and the LTC4151 or
LTC4151-1 acknowledges once more and latches the data
Table 1. LTC4151/LTC4151-1 Device Addressing*
HEX DEVICE
LTC4151/LTC4151-1
ADDRESS PINS
DESCRIPTION
ADDRESS
BINARY DEVICE ADDRESS
h
a6
1
1
1
1
1
1
1
1
1
1
a5
1
1
1
1
1
1
1
1
1
1
a4
0
0
0
0
0
0
0
0
0
0
a3
0
0
1
1
1
1
1
1
1
1
a2
1
1
0
0
0
0
1
1
1
1
a1
1
1
0
0
1
1
0
0
1
1
a0
0
1
0
1
0
1
0
1
0
1
R/W
0
ADR1
X
ADR0
X
Mass Write
CC
0
1
2
3
4
5
6
7
8
CE
X
H
L
D0
X
NC
H
H
D2
X
H
D4
X
NC
NC
L
NC
L
D6
X
D8
X
H
DA
X
H
NC
NC
L
DC
X
L
DE
X
L
*H = Tie High; L = Tie to GND; NC = Open; X = Don’t Care
41511fa
11
LTC4151/LTC4151-1
APPLICATIONS INFORMATION
Table 2. LTC4151/LTC4151-1 Register Address and Contents
REGISTER ADDRESS* REGISTER NAME
READ/WRITE
R/W**
R/W**
R/W**
R/W**
R/W**
R/W**
R/W
DESCRIPTION
00h
01h
02h
03h
04h
05h
06h
07h
SENSE (A)
SENSE (B)
VIN (C)
ADC Current Sense Voltage Data (8 MSBs)
ADC Current Sense Voltage Data (4 LSBs)
ADC VIN Voltage Data (8 MSBs)
ADC VIN Voltage Data (4 LSBs)
ADC ADIN Voltage Data (8 MSBs)
ADC ADIN Voltage Data (4 LSBs)
Controls ADC Operation Mode and Test Mode
VIN (D)
ADIN (E)
ADIN (F)
CONTROL (G)
Reserved
*Register address MSBs b7-b3 are ignored. **Writable if bit G4 is set.
Table 3. SENSE Registers A (00h) and B (O1h)—Read/Write
BIT
NAME
OPERATION
A7:0, B7:4 SENSE Voltage Data
12-Bit Data of Current Sense Voltage with 20μV LSB and 81.92mV Full-Scale
1 = SENSE Being Converted; 0 = SENSE Conversion Completed. Not Writable
Always Returns 0. Not Writable
B3
ADC Busy in Snapshot Mode
Reserved
B2:0
Table 4. VIN Registers C (02h) and D (O3h)—Read/Write
BIT
NAME
Voltage Data
OPERATION
12-Bit Data of V Voltage with 25mV LSB and 102.4V Full-Scale
C7:0, D7:4
D3
V
IN
IN
ADC Busy in Snapshot Mode
Reserved
1 = V Being Converted; 0 = V Conversion Completed. Not Writable
IN IN
D2:0
Always Returns 0, Not Writable
Table 5. ADIN Registers E (04h) and F (O5h)—Read/Write
BIT
NAME
OPERATION
E7:0, F7:4
F3
ADIN Voltage Data
ADC Busy in Snapshot Mode
Reserved
12-Bit Data of Current Sense Voltage with 500μV LSB and 2.048V Full-Scale
1 = ADIN Being Converted; 0 = ADIN Conversion Completed. Not Writable
Always Returns 0, Not Writable
F2:0
Table 6. CONTROL Register G (06h)—Read/Write
BIT
NAME
OPERATION
G7
ADC Snapshot Mode
Enable
Enables ADC Snapshot Mode; 1 = Snapshot Mode Enabled. Only the channel selected by G6 and G5 is
measured by the ADC. After the conversion, the channel busy bit is reset and the ADC is halted.
0 = Snapshot Mode Disabled (ADC free running, Default).
G6
G5
ADC Channel Label for
Snapshot Mode
ADC Channel Label for Snapshot Mode
G6
0
G5
0
1
ADC CHANNEL
ADC Channel Label for
Snapshot Mode
SENSE (Default)
0
1
V
IN
ADIN
0
G4
Test Mode Enable
Test Mode Halts ADC Operation and Enables Writes to ADC Registers; 1 = Enable Test Mode,
0 = Disable Test Mode (Default)
2
2
G3
Page Read/Write Enable
Stuck-Bus Timer Enable
Reserved
Enables Page Read/Write; 1 = Enable I C Page Read/Write (Default), 0 = Disable I C Page Read/Write
2
G2
Enables I C Stuck-Bus Reset Timer; 1 = Enable Stuck-Bus Timer (Default), 0 = Disable Stuck-Bus Timer
G1:0
Always Returns 0, Not Writable
41511fa
12
LTC4151/LTC4151-1
APPLICATIONS INFORMATION
and each of the following (if more) data bytes, as in a
Read Page command, the LTC4151/LTC4151-1 will keep
sendingouteachdatabyteintheregisterthatcorresponds
to the incrementing register pointer. The read operation
terminates and the register address pointer resets to 00h
when the master sends a Stop condition.
V
IN
R
S
I
LOAD
+
–
SENSE
SENSE
V
IN
GND
LTC4151
ADR1
ADR0
Layout Considerations
A Kelvin connection between the sense resistor R and
S
the LTC4151/LTC4151-1 is recommended to achieve ac-
curate current sensing (Figure 10). The minimum trace
width for 1oz copper foil is 0.02" per amp to make sure
the trace stays at a reasonable temperature. Using 0.03"
per amp or wider is recommended. Note that 1oz copper
exhibits a sheet resistance of about 530μΩ per square.
I
GND
LOAD
41511 F10
Figure 10. Recommended Layout for Kelvin Connection
TYPICAL APPLICATION
Temperature Monitoring with an NTC Thermistor While
Measuring Load Current and LTC4151 Supply Current
0.2Ω
V
IN
48V
VISHAY
2381 615 4.104
100k AT 25°C
1%
+
–
SENSE SENSE
V
IN
250mA
LOAD
SCL
SDA
2
40.2k
1%
I C
LTC4151
GND
ADIN
ADR1
1.5k
1%
ADR0
41511 TA02
T(°C) = 58.82 × (N
/N – 0.1066), 20°C < T < 60°C.
ADIN VIN
N
and N are digital codes measured by the ADC at the
VIN
ADIN
ADIN and V pins, respectively.
IN
41511fa
13
LTC4151/LTC4151-1
PACKAGE DESCRIPTION
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699)
R = 0.115
TYP
6
0.38 0.10
10
0.675 0.05
3.50 0.05
2.15 0.05 (2 SIDES)
1.65 0.05
3.00 0.10
(4 SIDES)
1.65 0.10
(2 SIDES)
PIN 1
PACKAGE
OUTLINE
TOP MARK
(SEE NOTE 6)
(DD) DFN 1103
5
1
0.25 0.05
0.50 BSC
0.75 0.05
0.200 REF
0.25 0.05
0.50
BSC
2.38 0.10
(2 SIDES)
2.38 0.05
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
41511fa
14
LTC4151/LTC4151-1
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
0.889 0.127
(.035 .005)
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
3.00 0.102
(.118 .004)
(NOTE 3)
(.0197)
0.497 0.076
(.0196 .003)
0.50
0.305 0.038
(.0120 .0015)
TYP
10 9
8
7 6
BSC
REF
RECOMMENDED SOLDER PAD LAYOUT
3.00 0.102
(.118 .004)
(NOTE 4)
4.90 0.152
(.193 .006)
DETAIL “A”
0° – 6° TYP
0.254
(.010)
GAUGE PLANE
1
2
3
4 5
0.53 0.152
(.021 .006)
0.86
(.034)
REF
1.10
(.043)
MAX
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.17 – 0.27
(.007 – .011)
TYP
0.1016 0.0508
(.004 .002)
0.50
(.0197)
BSC
MSOP (MS) 0307 REV E
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
41511fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LTC4151/LTC4151-1
TYPICAL APPLICATION
High Side Current, Input Voltage and Open Fuse Monitoring
with a Single LTC4151
F1
F2
D1
D2
V
IN1
RS
0.02Ω
48V
V
IN2
48V
+
–
D3
D4
SENSE
SENSE
V
IN
SCL
SDA
+
V
2
R1
150k
R2
301k
I C
LTC4151
GND
LOAD
ADR1
ADR0
ADIN
–
V
R3
3.4k
GND
41511 TA02
CONDITION
≥ 1.375 • N
RESULT
N
Normal Operation
F2 is Open
ADIN
VIN
0.835 • N ≤ N
< 1.375 • N
VIN
ADIN
ADIN
VIN
0.285 • N ≤ N
< 0.835 • N
F1 is Open
VIN
VIN
(Not Responding)
Both F1 and F2 are Open
V
and V are within 20% apart. N
IN2 ADIN
and N are digital codes measured by
IN1
VIN
the ADC at the ADIN and V pins, respectively.
IN
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
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Single-Ended Input, 0 to V Input Range, 60Hz Output Rate, 3mm × 2mm
CC
DFN-8 Package
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Power Supply Monitor and Margining Controller 14-Bit ADC Monitoring Current and Voltages, Supplies from 8V to 15V
2
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Hot Swap and No Latency Delta Sigma are trademarks of Linear Technology Corporation.
41511fa
LT 0109 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
© LINEAR TECHNOLOGY CORPORATION 2008
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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