LTC4151 Datasheet

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Datasheet

LTC4151
1
4151ff
For more information www.linear.com/LTC4151
Typical applicaTion
FeaTures
applicaTions
DescripTion
High Voltage I2C Current
and Voltage Monitor
The LT C
®
4151 is a high side power monitor that operates
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 and an external voltage.
Data is reported through the I2C interface when polled
by a host. The LTC4151 can also perform on-demand
measurement in a snapshot mode. The LTC4151 features
a dedicated shutdown pin to reduce power consumption.
The LTC4151-1/LTC4151-2 feature split I2C data pins to
drive opto-isolators. The data out on the LTC4151-1 is
inverted while that on the LTC4151-2 is not.
High Side Power Sensing with Onboard ADC and I2C
n Wide Operating Voltage Range: 7V to 80V
n 12-Bit Resolution for Both Current and Voltages
n I2C Interface
n Additional ADC Input Monitors an External Voltage
n Continuous Scan and Snapshot Modes
n Shutdown Mode (LTC4151) Reduces Quiescent
Current to 120µA
n Split SDA for Opto-Isolation (LTC4151-1/LTC4151-2)
n Available in 10-Lead MSOP, 10-Lead 3mm × 3mm
DFN and 16-Lead SO Packages
n –48V Telecom Infrastructure
n Automotive
n Industrial
n Consumer
12-Bit ADC DNL and INL
4151 TA01
3.3V
0.02Ω
µCONTROLLER
GND
LTC4151
SHDN
VIN
7V TO 80V VOUT
VIN
VDD
MEASURED
VOLTAGE
SCL
SDA
ADIN
ADR1
SCL
2k 2k
SDA
ADR0
GND
SENSE+SENSE
CODE
0
ADC DNL (LSB)
0
0.5
4096
–0.5
–1.0 1024 2048 3072
1.0
4151 TA01b
CODE
0
ADC INL (LSB)
0
0.5
4096
–0.5
–1.0 1024 2048 3072
1.0
4151 TA01c
PART PACKAGE FEATURED PIN
LTC4151 DD10, MS10 SHDN
LTC4151-1 DD10, MS10 SDAO
LTC4151-2 S16 SDAO
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
LTC4151
2
4151ff
For more information www.linear.com/LTC4151
absoluTe MaxiMuM raTings
VIN Voltage .................................................0.3V to 90V
SENSE+, SENSE Voltages ...........................VIN 10V or
0.3V to VIN + 0.3V
ADR1, ADR0 Voltages .............................. 0.3V to 90V
ADIN, SHDN, SDAO, SDAO Voltages ........... 0.3V to 6V
SCL, SDA, SDAI Voltages (Note 2) ........... 0.3V to 5.5V
SCL, SDA, SDAI Clamp Current ............................... 5mA
(Notes 1, 3)
pin conFiguraTion
Operating Temperature Range
LTC4151C/LTC4151C-1/LTC4151C-2 ......... C to 70°C
LTC4151I/LTC4151I-1/LTC4151I-2 .........40°C to 85°C
LTC4151H ........................................... 40°C to 125°C
Storage Temperature Range
MSOP, SO ..........................................6C to 150°C
DFN .................................................... 6C to 125°C
Lead Temperature (Soldering, 10 sec)
MSOP, SO .........................................................300°C
LTC4151 LTC4151
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
11
3
2
1SENSE
GND
SHDN
SDA
SCL
SENSE+
VIN
ADR1
ADR0
ADIN
TJMAX = 150°C, θJA = 45°C/W
EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL
1
2
3
4
5
10
9
8
7
6
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
SENSE
GND
SHDN
SDA
SCL
SENSE+
VIN
ADR1
ADR0
ADIN
TJMAX = 150°C, θJA = 85°C/W
LTC4151-1 LTC4151-1
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1SENSE
GND
SDAO
SDAI
SCL
SENSE+
VIN
ADR1
ADR0
ADIN
11
TJMAX = 125°C, θJA = 45°C/W
EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL
1
2
3
4
5
10
9
8
7
6
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
SENSE
GND
SDAO
SDAI
SCL
SENSE+
VIN
ADR1
ADR0
ADIN
TJMAX = 125°C, θJA = 85°C/W
LTC4151-2
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SENSE+
VIN
NC
NC
ADR1
NC
ADR0
NC
SENSE
NC
NC
GND
SDAO
SDAI
SCL
ADIN
TJMAX = 150°C, θJA = 100°C/W
LTC4151
3
4151ff
For more information www.linear.com/LTC4151
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4151CDD#PBF LTC4151CDD#TRPBF LCWZ 10-Lead (3mm × 3mm) Plastic DFN 0°C to 70°C
LTC4151IDD#PBF LTC4151IDD#TRPBF LCWZ 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LTC4151HDD#PBF LTC4151HDD#TRPBF LCWZ 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LTC4151CDD-1#PBF LTC4151CDD-1#TRPBF LCXC 10-Lead (3mm × 3mm) Plastic DFN 0°C to 70°C
LTC4151IDD-1#PBF LTC4151IDD-1#TRPBF LCXC 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LTC4151CMS#PBF LTC4151CMS#TRPBF LTCWY 10-Lead Plastic MSOP 0°C to 70°C
LTC4151IMS#PBF LTC4151IMS#TRPBF LTCWY 10-Lead Plastic MSOP –40°C to 85°C
LTC4151HMS#PBF LTC4151HMS#TRPBF LTCWY 10-Lead Plastic MSOP –40°C to 125°C
LTC4151CMS-1#PBF LTC4151CMS-1#TRPBF LTCXB 10-Lead Plastic MSOP 0°C to 70°C
LTC4151IMS-1#PBF LTC4151IMS-1#TRPBF LTCXB 10-Lead Plastic MSOP –40°C to 85°C
LTC4151CS-2#PBF LTC4151CS-2#TRPBF LTC4151S-2 16-Lead Plastic SO 0°C to 70°C
LTC4151IS-2#PBF LTC4151IS-2#TRPBF LTC4151S-2 16-Lead Plastic SO –40°C to 85°C
Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LT C 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
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
General
VIN Supply Voltage l7 80 V
IIN Supply Current VIN = 48V, Normal Operation Mode
VIN = 12V, Shutdown Mode
l
l
1.2
120
1.7
300
mA
µA
ISENSE+SENSE+ Input Current VIN, SENSE+, SENSE = 48V l5 9 µA
ISENSESENSE Input Current VIN, SENSE+, SENSE = 48V l0.1 1 µA
VSHDN(TH) SHDN Input Threshold l1 1.5 2 V
ISHDN SHDN Input Current SHDN = 0V l–3 –5 –8 µA
ADC
RES Resolution (No Missing Codes) (Note 4) l12 Bits
VFS Full-Scale Voltage (SENSE+ – SENSE)
VIN
ADIN
81.92
102.4
2.048
mV
V
V
LSB LSB Step Size (SENSE+ – SENSE)
VIN
ADIN
20
25
0.5
µV
mV
mV
TUE Total Unadjusted Error (SENSE+ – SENSE)
VIN (Note 5)
ADIN, C-Grade
ADIN, I-, H-Grade
l
l
l
l
±1.25
±1
±0.75
±1
%
%
%
%
VOS Offset Error (SENSE+ – SENSE)
VIN (Note 6)
ADIN
l
l
l
±5
±6
±8
LSB
LSB
LSB
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)
LTC4151
4
4151ff
For more information www.linear.com/LTC4151
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
INL Integral Nonlinearity (SENSE+ – SENSE)
VIN (Note 5)
ADIN
l
l
l
±1
±1
±0.5
±3
±3
±2
LSB
LSB
LSB
sTTransition Noise (SENSE+ – SENSE)
VIN
ADIN
1.2
0.3
22
µVRMS
mVRMS
µVRMS
fCONV Conversion Rate (Continuous Mode) l6 7.5 9 Hz
tCONV Conversion Time (Snapshot Mode) (SENSE+ – SENSE)
ADIN, VIN
l
l
53
26
67
33
85
42
ms
ms
RADIN ADIN Pin Input Resistance ADIN = 3V l2 10 MW
IADIN ADIN Pin Input Current ADIN = 3V l ±2 µA
I2C Interface
VADR(H) ADR0, ADR1 Input High Threshold l2.3 2.65 3.0 V
VADR(L) ADRO, ADRI Input Low Threshold l0.2 0.6 0.9 V
IADR(IN) ADRO, ADRI Input Current ADR0, ADR1 = 0V or 3V
ADR0, ADR1 = 0.8V or 2.2V
l
l
±8
±70 µA
µA
VSDA(OL) SDA, SDAO, SDAO Output Low Voltage ISDA, ISDAO, ISDAO = 8mA l0.15 0.4 V
ISDA,SCL(IN) SDA, SDAI, SDAO, SDAO, SCL Input
Current
SDA, SDAI, SDAO, SDAO, SCL = 5V l0 ±2 µA
VSDA,SCL(TH) SDA, SDAI, SCL Input Threshold l1.6 1.8 2 V
VSDA,SCL(CL) SDA, SDAI, SCL Clamp Voltage ISDA, ISDAI, ISCL = 3mA l5.5 6.1 6.6 V
I2C Interface Timing (Note 4)
fSCL(MAX) Maximum SCL Clock Frequency 400 kHz
tLOW Minimum SCL Low Period 0.65 1.3 µs
tHIGH Minimum SCL High Period 50 600 ns
tBUF(MIN) Minimum Bus Free Time Between Stop/
Start Condition
0.12 1.3 µs
tHD,STA(MIN) Minimum Hold Time After (Repeated) Start
Condition
140 600 ns
tSU,STA(MIN) Minimum Repeated Start Condition Set-Up
Time
30 600 ns
tSU,STO(MIN) Minimum Stop Condition Set-Up Time 30 600 ns
tHD,DATI(MIN) Minimum Data Hold Time Input –100 0 ns
tHD,DATO(MIN) Minimum Data Hold Time Output 300 600 900 ns
tSU,DAT(MIN) Minimum Data Set-Up Time Input 30 100 ns
tSP(MAX) Maximum Suppressed Spike
Pulse Width
50 110 250 ns
tRST Stuck-Bus Reset Time SCL or SDA/SDAI Held Low 20 33 ms
CXSCL, SDA Input Capacitance 5 10 pF
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 2: Internal clamps limit the SCL, SDA (LTC4151) and SDAI
(LTC4151-1/LTC4151-2) 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.
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)
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 VIN are tested
between 7V and 80V.
Note 6: Offset error of VIN is defined by extrapolating the straight line
measured between 7V and 80V.
LTC4151
5
4151ff
For more information www.linear.com/LTC4151
CODE
0
ADC DNL (LSB)
0
0.5
4096
–0.5
–1.0 1024 2048 3072
1.0
4151 G04
CODE
0
0
0.5
4096
–0.5
–1.0 1024 2048 3072
1.0
4151 G05
Typical perForMance characTerisTics
Supply Current vs Supply Voltage
(Normal Mode)
Supply Current vs Supply Voltage
(Shutdown Mode)
ADC Total Unadjusted Error
vs Code (ADIN Voltage)
ADC INL vs Code (ADIN Voltage)
VIN = 12V, TA = 25°C, unless noted.
ADC DNL vs Code (ADIN Voltage)
SUPPLY VOLTAGE (V)
0
SUPPLY CURRENT (mA)
1.00
1.15
80
0.85
0.70 20 40 60
1.30
4151 G01
– 40°C
85°C
25°C
SUPPLY VOLTAGE (V)
0
SUPPLY CURRENT (µA)
200
300
80
100
020 40 60
400
4151 G02
40°C
85°C
25°C
CODE
0
ADC TOTAL UNADJUSTED ERROR (%)
0
0.05
4096
–0.05
–0.10 1024 2048 3072
0.10
4151 G03
ADC Total Unadjusted Error
vs Code (SENSE Voltage)
ADC DNL vs Code (SENSE Voltage)
ADC INL vs Code (SENSE Voltage)
CODE
0
ADC INL (LSB)
0
1
4096
–1
–2 1024 2048 3072
2
4151 G08
CODE
0
ADC TOTAL UNADJUSTED ERROR (%)
0
0.5
4096
–0.5
–1.0 1024 2048 3072
1.0
4151 G06
CODE
0
ADC DNL (LSB)
0
1
4096
–1
–2 1024 2048 3072
2
4151 G07
LTC4151
6
4151ff
For more information www.linear.com/LTC4151
pin FuncTions
ADIN: ADC Input. The onboard ADC measures voltage
range between 0V and 2.048V. Tie to GND if unused.
ADR1, ADR0: I2C Device Address Inputs. Connecting
ADR1 and ADR0 to VIN, GND or leaving the pins open
configures one of nine possible addresses. See Table 1
in the Applications Information section for details.
Exposed Pad (DD Package Only): Exposed pad may be
left open or connected to device ground (GND).
GND: Device Ground.
SCL: I2C 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
can be placed between SCL and VIN. The voltage at SCL
is internally clamped to 6V (5.5V minimum).
SDA (LTC4151 Only): I2C Bus Data Input/Output. Used
for shifting in address, command or data bits and sending
out data. An external pull-up resistor or current source
is required and can be placed between SDA and VIN.
The voltage at SDA is internally clamped to 6V (5.5V
minimum).
SDAI (LTC4151-1/LTC4151-2 Only): I2C Bus Data Input.
Used for shifting in address, command, data, and SDAO
acknowledge bits. This pin is driven by an open-collector
output from a master controller. An external pull-up resistor
or current source is required and can be placed between
SDAI and VIN. If the master separates SDAI and SDAO,
data read at SDAO needs to be echoed back to SDAI for
proper I2C communication. The voltage at SDAI is internally
clamped to 6V (5.5V minimum).
SDAO (LTC4151-2 Only): Serial Bus Data Output. Open-
drain output used for sending data back to the master
controller or acknowledging a write operation. Normally
tied to SDAI to form the SDA line. An external pull-up
resistor or current source is required.
SDAO (LTC4151-1 Only): Inverted Serial Bus Data Out-
put. Open-drain output used for sending data back to the
master controller or acknowledging a write operation. Data
is inverted for convenience of opto-isolation. An external
pull-up resistor or current source is required.
SENSE+: Kelvin Sense of the VIN Pin. See Figure 10 for
recommended Kelvin connection.
SENSE: High Side Current Sense Input. Connect an
external sense resistor between SENSE+ and SENSE.
The differential voltage between SENSE+ and SENSE is
monitored by the onboard ADC with a full-scale sense
voltage of 81.92mV.
Typical perForMance characTerisTics
VIN = 12V, TA = 25°C, unless noted.
SDA, SDAO, SDAO Output Low vs
Pull-Up Current (VSDA(OL) vs ISDA)
SDA, SDAI, SCL Clamp Voltage
vs Load Current
ISDA (mA)
0
VSDA(OL) (V)
0.3
0.4
20
0.2
0.1
0510 15
0.5
4151 G09
40°C
25°C
85°C
ILOAD (mA)
0.01 0.1 1 10
6.2
6.1
6.0
5.9
6.3
4151 G10
V
SDA,SCL(CL)
(V)
– 40°C
85°C
25°C
LTC4151
7
4151ff
For more information www.linear.com/LTC4151
block DiagraM
operaTion
The LTC4151 accurately monitors high side current and
voltages. This device accepts a wide range of input volt-
ages from as low as 7V up to 80V and consumes 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 default continuous scan mode after power-up, the
onboard 12-bit analog-to-digital converter (ADC) continu-
ously and sequentially measures the high side differential
voltage between SENSE+ (Kelvin sense of VIN) and SENSE
(full-scale 81.92mV) through an internal sense amplifier,
the input voltage VIN (full-scale 102.4V) through 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.
In snapshot mode, the LTC4151 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 register
through the I2C interface. A status bit in the data register
monitors the ADC’s conversion. When the conversion is
completed, the 12-bit digital code of the measured voltage
is held in the corresponding data registers.
The LTC4151 provides an I2C interface to read the ADC
data from the data registers and to program the control
register. Tw o 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/LTC4151-2
provide separate data in (SDAI) and data out (SDAO on
the LTC4151-1 and SDAO on the LTC4151-2) pins to
facilitate opto-isolation.
SHUTDOWN
CONTROL
4151 BD
6.3V
I2C/
REGISTERS
DECODER
SHDN
(LTC4151)
VIN
5µA
2k
RS
VREF = 2.048V
SDA/SDAI
(LTC4151/
LTC4151-1)
ADR1
SCL
SDAO/SDAO
(LTC4151-1/
LTC4151-2)
ADR0
GND ADIN
15k
735k
INTERNAL
POWER
SENSE+SENSE
+
6V
12-BIT ADC
MUX
25X
6V
pin FuncTions
SHDN (LTC4151 Only): Shutdown Input. Internally pulled
up to 6.3V. Pull this pin below 1V to force the LTC4151
into shutdown mode. Leave this pin open if unused.
VIN: Supply Voltage Input. Accepts 7V to 80V. The voltage
at this pin is monitored by the onboard ADC with a full-
scale input range of 102.4V. SENSE+ must be connected
to VIN for proper ADC readout.
LTC4151
8
4151ff
For more information www.linear.com/LTC4151
applicaTions inForMaTion
The LTC4151 offers a compact complete solution for high
side power monitoring. With a wide operating voltage
range from 7V to 80V, this device is ideal for a variety of
applications including consumer, automotive, industrial
and telecom infrastructure. The simple application circuit as
shown in Figure 1 provides monitoring of high side current
with a 0.02W 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.
Data Converter
The LTC4151 features an onboard, 12-bit ∆Σ A/D
converter (ADC) that continuously monitors three volt-
ages in the sequence of (VSENSE+VSENSE) first, VIN
second and VADIN third. The ∆Σ architecture inherently
averages signal noise during the measurement period.
The differential voltage between SENSE+ and SENSE is
monitored with an 81.92mV full scale and 20µV resolu-
tion that allows accurate measurement of the high side
input current. SENSE+ is a Kelvin sense pin for the VIN
pin and must be connected to VIN (see Figure 10) for
proper ADC readout. The supply voltage at VIN is directly
measured with a 102.4V full scale 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. The 12-bit digital
Figure 1. Monitoring High Side Current and Voltages Using the LTC4151
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).
The data in registers A through F is refreshed at a frequency
of 7.5Hz in continuous scan mode. Setting control register
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
(either the SENSE voltage, VIN voltage, or ADIN voltage).
To enable snapshot mode, set control register bit G7 and
write the 2-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
measurement by clearing control bit G7, then re-enable the
snapshot mode and write the code of the desired voltage
according to the procedure described above. The Busy Bit
remains reset in the continuous scan mode.
4151 F01
0.02Ω
µ-CONTROLLER
GND
LTC4151
SHDN
VIN
7V TO 80V
VIN
VDD
VADIN
SCL
SDA
ADIN
ADR1
SCL
SDA
ADR0
GND
SENSE+SENSE
3.3V
VOUT
2k 2k
LTC4151
9
4151ff
For more information www.linear.com/LTC4151
SCL
SDA
START
CONDITION
STOP
CONDITION
ADDRESS R/W ACK DATA ACK DATA ACK
1 - 7 8 9
4151 F02
a6 - a0 b7 - b0 b7 - b0
1 - 7 8 9 1 - 7 8 9
P
S
Figure 2. General Data Transfer over I2C
I2C Interface
The LTC4151 features an I2C-compatible interface 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 I2C. The
LTC4151is a read-write slave device and supports SMBus
Read Byte, Write Byte, Read Word and Write Word com-
mands. The device also supports Read Page and Write
Page commands that allow one to read or write more than
two bytes of data. When using 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 the increment. Upon a Stop
condition, the register address 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.
applicaTions inForMaTion
Figure 3. LTC4151 Serial Bus SDA Write Byte Protocol
Figure 4. LTC4151 Serial Bus SDA Write Word Protocol
Figure 5. LTC4151 Serial Bus SDA Write Page Protocol
S ADDRESS
1 1 0 a3:a0
FROM MASTER TO SLAVE
FROM SLAVE TO MASTER
A: ACKNOWLEDGE (LOW)
A: NOT ACKNOWLEDGE (HIGH)
R: READ BIT (HIGH)
COMMAND DATA
X X X X X b2:b00
W
0 0 0b7:b0
A A A P
4151 F03
W: WRITE BIT (LOW)
S: START CONDITION
P: STOP CONDITION
S ADDRESS
1 1 0 a3:a0
COMMAND DATA DATA
X X X X X b2:b00
W
0 0 0 0
4151 F04
b7:b0b7:b0
AA A A P
S ADDRESS
1 1 0 a3:a0
COMMAND
0X X X X X b2:b00
W
0 0
4151 F05
A A A P
b7:b0
DATA
0
A
b7:b0
DATA
0
A
...
...
b7:b0
DATA
Figure 6. LTC4151 Serial Bus SDA Read Byte Protocol
S ADDRESS
1 1 0 a3:a0 1 1 0 a3:a0 1 0
COMMAND S ADDRESS R A
b7:b0 1
DATA
X X X X X b2:b00
W
0 0
4151 F06
A A AP
Figure 7. LTC4151 Serial Bus SDA Read Word Protocol
Figure 8. LTC4151 Serial Bus SDA Read Page Protocol
S ADDRESS
1 1 0 a3:a0 1 1 0 a3:a0 1 0
COMMAND S ADDRESS R A
b7:b0 1
DATA
X X X X X b2:b00
W
0 0
4151 F07
A
0
A
b7:b0
DATA
AAP
S ADDRESS
1 1 0 a3:a0 1 1 0 a3:a0 1 0
COMMAND S ADDRESS R A
b7:b0 1
DATA
X X X X X b2:b00
W
0 0
4151 F08
A
0
A
b7:b0
DATA
AAP
...
...
b7:b0
DATA
LTC4151
10
4151ff
For more information www.linear.com/LTC4151
Using Opto-Isolators with LTC4151-1 and LTC4151-2
The LTC4151-1/LTC4151-2 split the SDA line into SDAI
(input) and SDAO (LTC4151-1 inverted output) or SDAO
(LTC4151-2 output) for convenience of opto-coupling
with a host controller that sits at a different ground level.
When using opto-isolators with the LTC4151-1, connect
the SDAI to the output of the incoming opto-coupler and
connect the SDAO to the anode of the outgoing opto-
coupler (see Figure 9). With the outgoing opto-coupler
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 to VIN. In this way (with SDAO
rather than conventional SDAO), the need for a separate
low voltage supply for pull-ups is eliminated.
Figure 11 shows the LTC4151-2 with high speed opto-
couplers for faster bus speeds. The LTC4151-2 has a non-
inverter SDAO output. Powered from VIN, the high voltage
LT3010-5 low dropout regulator provides the supply for the
opto-couplers as well as the bus lines pull-up. If the SDAI
and SDAO on the master controller are not tied together,
the ACK bit of the SDAO must be returned back to SDAI.
Start and Stop Conditions
When the I2C 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.
Stuck-Bus Reset
The LTC4151 I2C 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, the stuck-bus
timer will expire and the internal I2C state machine will be
reset to allow normal communication after the stuck-bus
condition is cleared. The stuck-bus timer can be disabled
by clearing control register bit G2.
applicaTions inForMaTion
Figure 9. Opto-Isolation of the I2C Interface Between LTC4151-1 and a
Microcontroller (1.5kHz Data Rate of I2C is Limited by Slew Rate of Opto-Isolators)
4151 F09
3.3V
RS
0.02Ω
µ-CONTROLLER
GND
LTC4151-1
SCL
SCL
VIN
48V
VIN
VDD
VADIN
SDAI
ADIN
ADR1
R5
0.51k
R6
10k
R7
10k
R4
0.51k
R1
20k
R2
20k
R3
5.1k
18
27
36
45
81
72
63
54
SDA
ADR0
GND
SENSE+SENSE
SDA0
MOCD207M
MOCD207M
LTC4151
11
4151ff
For more information www.linear.com/LTC4151
applicaTions inForMaTion
Table 1. LTC4151 Device Addressing*
DESCRIPTION
HEX DEVICE
ADDRESS BINARY DEVICE ADDRESS
LTC4151
ADDRESS PINS
h a6 a5 a4 a3 a2 a1 a0 R/WADR1 ADR0
Mass Write CC 1 1 0 0 1 1 0 0 X X
0 CE 1 1 0 0 1 1 1 X H L
1 D0 1 1 0 1 0 0 0 X NC H
2 D2 1 1 0 1 0 0 1 X H H
3 D4 1 1 0 1 0 1 0 X NC NC
4 D6 1 1 0 1 0 1 1 X NC L
5 D8 1 1 0 1 1 0 0 X L H
6 DA 1 1 0 1 1 0 1 X H NC
7 DC 1 1 0 1 1 1 0 X L NC
8 DE 1 1 0 1 1 1 1 X L L
*H = Tie High; L = Tie to GND; NC = Open; X = Don’t Care
I2C Device Addressing
Nine distinct I2C bus addresses are configurable using 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 addition, the
LTC4151 will respond to a mass write address (1100 110)
b for writing to all LTC4151s, regardless of their individual
address settings.
Acknowledge
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 pulls the SDA line low on the 9th clock cycle to
acknowledge receipt of the data. If the slave fails to ac-
knowledge 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
must pull down the SDA line during 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.
Write Protocol
The master begins a write operation with a Start condition
followed by the seven bit slave address and the R/W bit
set to zero. After the addressed LTC4151 acknowledges
the address byte, the master then sends a command
byte which indicates which internal register the master
wishes to write. The LTC4151 acknowledges this and
then latches the lower three bits of the command byte
into its internal register address pointer. The master then
delivers the data byte and the LTC4151 acknowledges
once more and latches the data into its internal register.
If the master continues sending a second byte or more
data bytes, as in a Write Word or Write Page command,
the second byte or more data bytes will be acknowledged
by the LTC4151, 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.
Read Protocol
The master begins a read operation with a Start condition
followed by the seven bit slave address and the R/W bit
set to zero. After the addressed LTC4151 acknowledges
the address byte, the master then sends a command
byte that indicates which internal register the master
wishes to read. The LTC4151 acknowledges 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
LTC4151
12
4151ff
For more information www.linear.com/LTC4151
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
B3 ADC Busy in Snapshot Mode 1 = SENSE Being Converted; 0 = SENSE Conversion Completed. Not Writable
B2:0 Reserved Always Returns 0. Not Writable
Table 4. VIN Registers C (02h) and D (O3h)—Read/Write
BIT NAME OPERATION
C7:0, D7:4 VIN Voltage Data 12-Bit Data of VIN Voltage with 25mV LSB and 102.4V Full-Scale
D3 ADC Busy in Snapshot Mode 1 = VIN Being Converted; 0 = VIN Conversion Completed. Not Writable
D2:0 Reserved Always Returns 0, Not Writable
Table 5. ADIN Registers E (04h) and F (O5h)—Read/Write
BIT NAME OPERATION
E7:0, F7:4 ADIN Voltage Data 12-Bit Data of Current Sense Voltage with 500µV LSB and 2.048V Full-Scale
F3 ADC Busy in Snapshot Mode 1 = ADIN Being Converted; 0 = ADIN Conversion Completed. Not Writable
F2:0 Reserved Always Returns 0, Not Writable
applicaTions inForMaTion
Table 2. LTC4151 Register Address and Contents
REGISTER ADDRESS* REGISTER NAME READ/WRITE DESCRIPTION
00h SENSE (A) R/W** ADC Current Sense Voltage Data (8 MSBs)
01h SENSE (B) R/W** ADC Current Sense Voltage Data (4 LSBs)
02h VIN (C) R/W** ADC VIN Voltage Data (8 MSBs)
03h VIN (D) R/W** ADC VIN Voltage Data (4 LSBs)
04h ADIN (E) R/W** ADC ADIN Voltage Data (8 MSBs)
05h ADIN (F) R/W** ADC ADIN Voltage Data (4 LSBs)
06h CONTROL (G) R/W Controls ADC Operation Mode and Test Mode
07h Reserved
*Register address MSBs b7-b3 are ignored. **Writable if bit G4 is set.
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 ADC Channel Label for
Snapshot Mode
ADC Channel Label for Snapshot Mode
G6 G5 ADC CHANNEL
0 0 SENSE (Default)
0 1 VIN
1 0 ADIN
G5 ADC Channel Label for
Snapshot Mode
G4 Test Mode Enable Test Mode Halts ADC Operation and Enables Writes to ADC Registers; 1 = Enable Test Mode,
0 = Disable Test Mode (Default)
G3 Page Read/Write Enable Enables Page Read/Write; 1 = Enable I2C Page Read/Write (Default), 0 = Disable I2C Page Read/Write
G2 Stuck-Bus Timer Enable Enables I2C Stuck-Bus Reset Timer; 1 = Enable Stuck-Bus Timer (Default), 0 = Disable Stuck-Bus Timer
G1:0 Reserved Always Returns 0, Not Writable
LTC4151
13
4151ff
For more information www.linear.com/LTC4151
address with the R/W bit now set to one. The LTC4151
acknowledges and sends the contents of the requested
register. The transmission terminates when the master
sends a Stop condition. If the master acknowledges the
transmitted data byte, as in a Read Word command, the
LTC4151 will send the contents of the next register. If
the master acknowledges the second data byte and each
of the following (if more) data bytes, as in a Read Page
command, the LTC4151 will keep sending out each data
byte in the register that corresponds to the incrementing
register pointer. The read operation terminates and the
register address pointer resets to 00h when the master
sends a Stop condition.
Layout Considerations
A Kelvin connection between the sense resistor RS and
the LTC4151 is recommended to achieve accurate cur-
rent sensing (Figure 10). The minimum trace width for
1oz copper foil is 0.02" per amp to make sure the trace
applicaTions inForMaTion
4151 F10
SENSE
GND
SENSE+
VIN
ADR1
ADR0
LTC4151
VIN
GND
RSILOAD
ILOAD
Figure 10. Recommended Layout for Kelvin Connection
stays at a reasonable temperature. Using 0.03" per amp
or wider is recommended. Note that 1oz copper exhibits
a sheet resistance of about 530µW per square.
ADINADIN
R1
0.02Ω
LTC4151-2
VIN
7V TO 80V VOUT
VCC
8
5V
1
2
8
7
6
5
1
2
3
4
ISO_SDA
ISO_SCL
7
5
GND
4
1
2
8
5
C7
F
100V
VIN
VIN
ADR1
ADR0
SDAO
IN
LT3010-5
SHDN
OUT
SENSE
GND
SDAI
SCL
GND
SENSE+SENSE
C6
F
ISO1
PS9817-2
ISO2
PS9817-2
R3
10k
R4
10k
R11
1k
R13
10k
4151 F11
R12
1k
R14
10k
R8
1k C4
0.1µF
VCC
GND
Figure 11. LTC4151-2 I2C Opto-Isolation Interface with High Speed Opto-Couplers
LTC4151
14
4151ff
For more information www.linear.com/LTC4151
Typical applicaTion
LTC4151
SCL
VIN
48V
VIN
SENSE+SENSE
0.2Ω
I2C
SDA
ADR1
ADR0
ADIN
40.2k
1%
100k AT 25°C
1%
1.5k
1%
VISHAY
2381 615 4.104
250mA
LOAD
GND
4151 TA02
Temperature Monitoring with an NTC Thermistor While
Measuring Load Current and LTC4151 Supply Current
T(°C) = 58.82 • (NADIN /NVIN – 0.1066), 20°C < T < 60°C.
NADIN AND NVIN ARE DIGITAL CODES MEASURED BY THE
ADC AT THE ADIN AND VIN PINS, RESPECTIVELY.
LTC4151-1 Monitors Current and Input Voltage of a –48V System and Interfaces with
a Microcontroller (1.5kHz Data Rate of I2C is Limited by Slew Rate of Opto-Isolators)
4151 TA04
3.3V
R
S
0.02Ω
µ-CONTROLLER
GND
LTC4151-1
SCL
SCL
RTN
48V
VIN
VDD
VADIN
SDAI
ADIN
ADR1
R5
0.51k
R6
10k
R7
10k
R4
0.51k
R1
20k
R2
20k
R3
5.1k
18
27
36
45
81
72
63
54
SDA
ADR0
GND
SENSE+SENSE
SDA0
MOCD207M
MOCD207M
LTC4151
15
4151ff
For more information www.linear.com/LTC4151
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699 Rev C)
3.00 ±0.10
(4 SIDES)
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
0.40 ± 0.10
BOTTOM VIEW—EXPOSED PAD
1.65 ± 0.10
(2 SIDES)
0.75 ±0.05
R = 0.125
TYP
2.38 ±0.10
(2 SIDES)
15
106
PIN 1
TOP MARK
(SEE NOTE 6)
0.200 REF
0.00 – 0.05
(DD) DFN REV C 0310
0.25 ± 0.05
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
1.65 ±0.05
(2 SIDES)2.15 ±0.05
0.50
BSC
0.70 ±0.05
3.55
±0.05
PACKAGE
OUTLINE
0.25 ± 0.05
0.50 BSC
PIN 1 NOTCH
R = 0.20 OR
0.35 × 45°
CHAMFER
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
MSOP (MS) 0213 REV F
0.53 ±0.152
(.021 ±.006)
SEATING
PLANE
0.18
(.007)
1.10
(.043)
MAX
0.17 –0.27
(.007 – .011)
TYP
0.86
(.034)
REF
0.50
(.0197)
BSC
1234 5
4.90 ±0.152
(.193 ±.006)
0.497 ±0.076
(.0196 ±.003)
REF
8910 76
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
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
0.254
(.010) 0° – 6° TYP
DETAIL “A”
DETAIL “A”
GAUGE PLANE
5.10
(.201)
MIN
3.20 – 3.45
(.126 – .136)
0.889 ±0.127
(.035 ±.005)
RECOMMENDED SOLDER PAD LAYOUT
0.305 ±0.038
(.0120 ±.0015)
TYP
0.50
(.0197)
BSC
0.1016 ±0.0508
(.004 ±.002)
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661 Rev F)
LTC4151
16
4151ff
For more information www.linear.com/LTC4151
package DescripTion
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)× 45°
0° – 8° TYP
.008 – .010
(0.203 – 0.254)
1
N
2345678
N/2
.150 – .157
(3.810 – 3.988)
NOTE 3
16 15 14 13
.386 – .394
(9.804 – 10.008)
NOTE 3
.228 – .244
(5.791 – 6.197)
12 11 10 9
S16 REV G 0212
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
.245
MIN
N
1 2 3 N/2
.160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE
S Package
16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610 Rev G)
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
LTC4151
17
4151ff
For more information www.linear.com/LTC4151
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.
revision hisTory
REV DATE DESCRIPTION PAGE NUMBER
C 11/10 Added H-grade information
Revised order of Pin Functions section and added information to SDAI pin description
Added diode and 2k resistor to Block Diagram
Added information to Application Information section
2, 3
6
7
10
D 7/12 Changed part number in Pin Configuration section from LT4151 to LTC4151 2
E 11/12 Added –48V application schematic 14
F 3/14 Increased VADR(H) MAX limit and decreased VADR(L) MIN limit 4
(Revision history begins at Rev C)
LTC4151
18
4151ff
For more information www.linear.com/LTC4151
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
LINEAR TECHNOLOGY CORPORATION 2008
LT 0314 REV F • PRINTED IN USA
(408) 432-1900 FAX: (408) 434-0507 www.linear.com/LTC4151
4151 TA03
LOAD
RS
0.02Ω
LTC4151
SCL
VIN2
48V
VIN
I2C
SDA
ADR1
ADR0
ADIN
R2
301k
R3
3.4k
R1
150k
D4
D2F2
GND
GND
SENSE+SENSE
V+
V
D3
VIN1
48V
D1F1
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LT2940 Power and Current Monitor Four-Quadrant Multiplication, ±5% Power Accuracy, 4V to 80V Operation
LTC2945 Wide Range I2C Power Monitor 0V to 80V Input Range, 2.7V to 80V Supply Range, Shunt Regulator, 12-Bit ADC
with ±0.75% TUE
LTC2451 16-Bit I2C Ultra Tiny Delta Sigma ADC Single-Ended Input, 0 to VCC Input Range, 60Hz Output Rate, 3mm × 2mm
DFN-8 Package
LTC2453 16-Bit I2C Ultra Tiny Delta Sigma ADC Differential Input, ±VCC Input Range, 60Hz Output Rate, 3mm × 2mm
DFN-8 Package
LTC2970 Power Supply Monitor and Margining Controller 14-Bit ADC Monitoring Current and Voltages, Supplies from 8V to 15V
LTC4215 Positive Hot SwapTM Controller with ADC and I2C 8-Bit ADC Monitoring Current and Voltages, Supplies from 2.9V to 15V
LTC4260 Positive High Voltage Hot Swap Controller with
ADC and I2C
8-Bit ADC Monitoring Current and Voltages, Supplies from 8.5V to 80V
LTC4261/
LTC4261-2
Negative High Voltage Hot Swap Controller with
ADC and I2C
10-Bit ADC Monitoring Current and Voltages, Supplies from –12V
LTC6101/
LTC6101HV
High Voltage, High Side Current Sense Amplifier
in SOT-23 Package
Supplies from 4V to 60V (LTC6101) and 5V to 100V (LTC6101HV)
High Side Current, Input Voltage and Open Fuse Monitoring
with a Single LTC4151
CONDITION RESULT
NADIN ≥ 1.375 • NVIN Normal Operation
0.835 • NVIN ≤ NADIN < 1.375 • NVIN F2 is Open
0.285 • NVIN ≤ NADIN < 0.835 • NVIN F1 is Open
(Not Responding) Both F1 and F2 are Open
VIN1 AND VIN2 ARE WITHIN 20% APART. NADIN AND NVIN ARE DIGITAL CODES
MEASURED BY THE ADC AT THE ADIN AND VIN PINS, RESPECTIVELY.

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