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.

ADM1191

SENSE

SETV

VCC

CONV

MUX

ALERT

GND

COMPARATOR

CURRENT

SENSE

AMPLIFIER

SDA

SCL

ALERTB

05804-001

12-BIT

ADC

SENSE

P = VI

CONTROLLER

ADM1191

SENSEVCC

SDA SCL

GND

ALERTB

CONV

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

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.

C® interface.

C interface allows a controller to read

C command or via the convert (CONV) pin.

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

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

2 mA

−2.45

+2.45

= 50 mV

Low Range (VRANGE = 1)

6.65 V

High Range (VRANGE = 0)

26.52

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

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

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

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 %

+0.85

+0.9

Unit Conditions

VCC rising

= 75 mV

SENSE

= 50 mV

SENSE

= 25 mV

SENSE

= 12.5 mV

SENSE

= 75 mV

SENSE

= 50 mV

SENSE

= 25 mV

SENSE

= 12.5 mV

SENSE

= 75 mV

SENSE

= 25 mV

SENSE

= 12.5 mV

SENSE

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

Rev. C | Page 3 of 16

= 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

kΩ

Output Fall Time on SDA from V

to V

20 + 0.1 C

250

= 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

ADR LOWV

ADR LOWZ

−0.3 +0.3 µA Open state, maximum load allowed

ADRHIGHZ

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

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

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.

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).

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).

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

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

= 2.0 V to 5.5 V

ADR

= 3.0 V to 5.5 V

BUS

= 3.0 V to 5.5 V

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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