ANALOG DEVICES ADM1191 Service Manual
with Convert Pin and ALERTB Output
ADM1191
Rev. C
Trademarks and registered trademarks are the property of their respective owners.
Fax: 781.461.3113 ©2006–2012 Analog Devices, Inc. All rights reserved.
V
I
0
1
ADM1191
SENSE
SETV
VCC
CONV
MUX
I
2
C
ALERT
GND
COMPARATOR
CURRENT
SENSE
AMPLIFIER
A
SDA
SCL
A1
A0
ALERTB
05804-001
12-BIT
ADC
R
SENSE
P = VI
CONTROLLER
ADM1191
SENSEVCC
SDA
SCL
SDA
SCL
GND
ALERTB
CONV
CONV
A0
A1
3.15V TO 26V
SETV
INTERRUPT
05804-002
Data Sheet
FEATURES
Powered from 3.15 V to 26 V
Precision current sense amplifier
Precision voltage input
12-bit ADC for current and voltage readback
Convert (CONV) pin for commanding an ADC read
SETV input for setting overcurrent alert threshold
ALERTB output provides an overcurrent interrupt
2
I
C fast mode-compliant interface (400 kHz maximum)
2 address pins allow 16 devices on the same bus
10-lead MSOP
APPLICATIONS
Power monitoring/power budgeting
Central office equipment
Telecommunications and data communications equipment
PCs/servers
GENERAL DESCRIPTION
The ADM1191 is an integrated current sense amplifier that
offers digital current and voltage monitoring via an on-chip
12-bit analog-to-digital converter (ADC), communicated
through an I
An internal current sense amplifier measures voltage across the
sense resistor in the power path via the VCC pin and the SENSE pin.
A 12-bit ADC can measure the current seen in the sense
resistor, as well as the supply voltage on the VCC pin.
An industry-standard I
current and voltage data from the ADC. Measurements can be
initiated by an I
The CONV pin is especially useful for synchronizing reads on
multiple ADM1191 devices. Alternatively, the ADC can run
continuously, and the user can read the latest conversion data
whenever it is required. Up to 16 unique I
created, depending on the way the A0 pin and the A1 pin are
connected.
A SETV pin is also included. A voltage applied to this pin is
internally compared with the output voltage on the current
sense amplifier. The output of the SETV comparator asserts
when the current sense amplifier output exceeds the SETV
voltage. When this event occurs, the ALERTB output asserts.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
2
C® interface.
2
C interface allows a controller to read
2
C command or via the convert (CONV) pin.
2
C addresses can be
The ALERTB output can be used as a flag to warn a microcontroller or field programmable gate array (FPGA) of an
overcurrent condition. ALERTB outputs of multiple ADM1191
devices can be tied together and used as a combined alert.
The ADM1191 is packaged in a 10-lead MSOP.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Digital Power Monitor
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
Figure 2. Applications Diagram
www.analog.com
ADM1191 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Characteristics .............................................................. 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Voltage and Current Readback ....................................................... 9
Serial Bus Interface ....................................................................... 9
REVISION HISTORY
6/12—Rev. B to Rev. C
Added V
Changed SETV Pin Rating from 30 V to 6 V, Table 2 ................. 5
Changes to Pin 3, Pin 5, and Pin 10 Descriptions ........................ 6
Changes to Bit 2, Table 9 ................................................................ 12
Changes to ALERTB Output Section ........................................... 15
Changes to Kelvin Sense Resistor Connection Section ............. 15
Deleted Figure 27 ............................................................................ 15
Updated Outline Dimensions ....................................................... 16
2/08—Rev. A to Rev. B
Changed V
Added ADC Conversion Time Parameter .................................... 3
Changes to Input Current for 00 Decode, I
Changes to Input Current for 11 Decode, I
Added Endnote 2 .............................................................................. 4
Changes to Figure 6 .......................................................................... 7
Changes to Identifying the ADM1191 on the I
Changes to General I
Changes to Table 5 ............................................................................ 9
Changes to Figure 16 and Figure 17 ............................................. 10
Changes to Quick Command Section ......................................... 11
Changes to Figure 19 ...................................................................... 11
Changes to Table 7 .......................................................................... 11
Changes to Write Extended Command Byte Section ................ 12
Changes to Figure 21 ...................................................................... 12
Changes to Table 9 and Table 11 ................................................... 12
Changes to Converting ADC Codes to Voltage and
Current Readings Section ......................................................... 13
Changes to Figure 25 ...................................................................... 15
Change to SETV Pin Section ........................................................ 15
= 3.0 V to 5.5 V Condition to VIL and VIH, Table 1 .. 4
BUS
to VCC Throughout ................................................. 3
VCC
, Parameter ... 4
ADRL OW
, Parameter ... 4
ADRHIGH
2
2
C Timing Section, Step 3 ........................... 9
C Bus Section ......... 9
Identifying the ADM1191 on the I2C Bus ..................................9
General I2C Timing .......................................................................9
Write and Read Operations ........................................................... 11
Quick Command ........................................................................ 11
Write Command Byte ................................................................ 11
Write Extended Command Byte .............................................. 12
Read Voltage and/or Current Data Bytes ................................ 13
Applications Information .............................................................. 15
ALERTB Output ......................................................................... 15
SETV Pin ..................................................................................... 15
Kelvin Sense Resistor Connection ........................................... 15
Outline Dimensions ....................................................................... 16
Ordering Guide .......................................................................... 16
4/07—Rev. 0 to Rev. A
Changes to Table 1 ............................................................................. 3
Changes to Table 5 ............................................................................. 9
Changes to Figure 16 and Figure 17 ............................................ 10
Changes to Figure 21 ...................................................................... 12
Changes to Figure 23 and Figure 24 ............................................ 13
Added Applications Information Heading ................................. 15
9/06—Revision 0: Initial Version
Rev. C | Page 2 of 16
Data Sheet ADM1191
V
2 mA
%
−2.45
+2.45
%
V
= 50 mV
%
%
%
Low Range (VRANGE = 1)
6.65 V
High Range (VRANGE = 0)
26.52
V
µA
SPECIFICATIONS
VCC = 3.15 V to 26 V, TA = −40°C to +85°C, typical values at TA = 25°C, unless otherwise noted.
Table 1.
Parameter Min
VCC PIN
Operating Voltage Range, VCC 3.15
Supply Current, ICC 1.7
Undervoltage Lockout, V
Undervoltage Lockout Hysteresis, V
2.8
UVLO
80
UVLOHYST
CONV PIN
Input Current, I
Logic Low Threshold, V
Logic High Threshold, V
−2 +2 µA
CONV
1.2 V
CONVL
1.4 V
CONVH
MONITORING ACCURACY1
Current Sense Absolute Accuracy
0°C to +70°C −1.45
−1.8
−2.8
−5.7
0°C to +85°C −1.5
−1.8
−2.95
−6.1
−40°C to +85°C −1.95
−3.85
−6.7
V
for ADC Full Scale2 105.84
SENSE
Voltage Sense Accuracy
0°C to +70°C −0.85
−0.9 +0.9 % VCC = 10.8 V to 16.5 V (high range)
0°C to +85°C −0.85
−0.9 +0.9 % VCC = 10.8 V to 16.5 V (high range)
−40°C to +85°C −0.9
−1.15 +1.15 % VCC = 10.8 V to 16.5 V (high range)
VCC for ADC Full Scale3
Typ
Max
26
V
mV
+1.45 % V
+1.8 % V
+2.8 %
+5.7
+1.5 %
+1.8 %
+2.95 %
+6.1 %
+1.95 % V
+3.85 %
+6.7 %
mV
+0.85
+0.85
+0.9
Unit Conditions
VCC rising
= 75 mV
SENSE
= 50 mV
SENSE
V
= 25 mV
SENSE
V
= 12.5 mV
SENSE
V
= 75 mV
SENSE
V
= 50 mV
SENSE
V
= 25 mV
SENSE
V
= 12.5 mV
SENSE
= 75 mV
SENSE
SENSE
V
= 25 mV
SENSE
V
= 12.5 mV
SENSE
VCC = 3.0 V to 5.5 V (low range)
VCC = 3.0 V to 5.5 V (low range)
VCC = 3.0 V to 5.5 V (low range)
ADC Conversion Time4 150 µs
SENSE PIN
Input Current, I
SETV PIN
Overcurrent Trip Threshold 98 100 102 mV V
49.5 50 50.5 mV V
Overcurrent Trip Gain, V
Input Current, I
ALERTB PIN
Output Low Voltage, V
1 1.5 mA I
Input Current, I
−1
SENSE
/(VCC − V
SETV
−1 +1 µA V
SETVLEAK
0.05 0.1 V I
ALERTOL
ALERT
) 18 V
SENSE
−1 +1 µA V
+1
Rev. C | Page 3 of 16
V
= VCC
SENSE
= 1.8 V
SETV
= 0.9 V
SETV
= 0.9 V to 1.9 V
SETV
= 0.9 V to 1.9 V
SETV
= −100 µA
ALERT
= −2 mA
ALERT
= VCC; ALERTB not asserted
ALERT
ADM1191 Data Sheet
V
kΩ
V
Output Fall Time on SDA from V
to V
20 + 0.1 C
250
ns
C
= bus capacitance from SDA to GND
SCL Clock Frequency, f
400
kHz
Parameter Min
A0 PIN, A1 PIN
Set Address to 00, V
Set Address to 01, R
Set Address to 10, I
Set Address to 11, V
Input Current for 00 Decode, I
Input Current for 11 Decode, I
0
ADR LOWV
80
ADR LOWZ
−0.3 +0.3 µA Open state, maximum load allowed
ADRHIGHZ
2
ADRHIGHV
−40 −25
ADRLO W
ADRHIGH
I2C TIMING
Low Level Input Voltage, V
High Level Input Voltage, V
Low Level Output Voltage on SDA, V
IL
IH
OL
IHMIN
Maximum Width of Spikes Suppressed by
0.3 V
0.7 V
V V
BUS
0.4 V IOL = 3 mA
ILMAX
50 250 ns
Input Filtering on SDA and SCL Pins
Input Current, II, on SDA/SCL When Not
−10 +10 µA
Driving a Logic Low Output
Input Capacitance on SDA/SCL
SCL
Low Period of the SCL Clock
High Period of the SCL Clock
Setup Time for Repeated Start Condition, t
SDA Output Data Hold Time, t
Setup Time for a Stop Condition, t
HD ;DAT
SU;STO
Bus Free Time Between a Stop and a Start
Condition, t
BUF
Capacitive Load for Each Bus Line
1
Monitoring accuracy is a measure of the error in a code that is read back for a particular voltage/current. This is a combination of amplifier error, reference error, ADC
error, and error in ADC full-scale code conversion factor.
2
This is an absolute value to be used when converting ADC codes to current readings; any inaccuracy in this value is factored into absolute current accuracy values (see
the specifications for the Current Sense Absolute Accuracy parameter).
3
These are absolute values to be used when converting ADC codes to voltage readings; any inaccuracy in these values is factored into voltage accuracy values (see the
specifications for the Voltage Sense Accuracy parameter).
4
Time between the receipt of the command byte and the actual ADC result being placed in the register.
5 pF
600 ns
1300 ns
600 ns
SU;STA
100 900 ns
600 ns
1300 ns
400 pF
BUS
Typ
Max
0.8
120
160
5.5
3
6 µA
Unit Conditions
µA
V V
BUS
Low state
Resistor to ground state, load pin with
specified resistance for 01 decode
on the A0 pin or A1 pin for 10 decode
High state
V
= 0 V to 0.8 V
ADR
V
= 2.0 V to 5.5 V
ADR
= 3.0 V to 5.5 V
BUS
= 3.0 V to 5.5 V
BUS
BUS
Rev. C | Page 4 of 16
Data Sheet ADM1191
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
VCC Pin 30 V
SENSE Pin 30 V
CONV Pin −0.3 V to +6 V
SETV Pin 6 V
ALERTB Pin 30 V
SDA Pin, SCL Pin −0.3 V to +6 V
A0 Pin, A1 Pin −0.3 V to +6 V
Storage Temperature Range −65°C to +125°C
Operating Temperature Range −40°C to +85°C
Lead Temperature (Soldering, 10 sec) 300°C
Junction Temperature 150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL CHARACTERISTICS
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type θJA Unit
10-Lead MSOP 137.5 °C/W
ESD CAUTION
Rev. C | Page 5 of 16
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