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ADM1191:  Digital Power Monitor with Convert Pin and ALERTB Output

Product Details

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 I2C interface.

An internal current sense amplifier senses 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 I2C interface allows a controller to read current and voltage data from the ADC. Measurements can be initiated by an I2C command or via the convert (CONV) pin. 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 I2C addresses can be 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 to the output voltage on the current sense amplifier. The output of the SETV comparator asserts when the current sense amplifier ouput exceeds the SETV voltage. When this event occurs, the ALERTB output asserts.

The ALERTB output can be used as a flag to warn a micro-controller 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.


  • Power monitoring/power budgeting
  • Central office equipment
  • Telecommunication and data communication equipment
  • PCs/servers


  • Powered from 3.15 V to 26 V
  • Precision current sense amplifier
  • Precision voltage input
  • 12-bit ADC for current and voltage readback
  • Convert pin (CONV) for commanding an ADC read
  • SETV input for setting overcurrent alert threshold
  • ALERTB output provides an overcurrent interrupt
  • I2C® fast mode-compliant interface (400 kHz maximum)
  • Two address pins allow 16 devices on the same bus
  • 10-lead MSOP

Functional Block Diagram for ADM1191


Title Content Type File Type
ADM1191: Digital Power Monitor with Convert Pin and ALERTB Output Datasheet (Rev C, 06/2012) (pdf, 397 kB) Data Sheets PDF
UG-404: USB-SDP-CABLEZ Serial Interface Board  (pdf, 536 kB)
The USB-SDP-CABLEZ is primarily used to communicate with certain Analog Devices evaluation boards.
User Guides PDF
Power System Management (Spring 2007)  (pdf, 1170 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADM1175-78 & ADM1191-92 Evaluation Software
This version of software supports Windows XP, Windows Vista, and Windows 7 and is recommended for new installations. It requires the ADMxxxx Common Run-time to be installed in order to provide driver support for the all supported I2C interfaces. This includes the USB-SDP-CABLEZ, USB-SMBUS-CABLEZ and USB-5PSMBUS-CABLEZ interfaces.
Evaluation Software HTML
ADMxxxx Common Run-Time
This run-time installer is shared between the SuperSequencer, ADM1175-92 and ADM1293/4 and the Hot Swap and Power Monitor tools. Contains driver support for the USB-SMBUS-CABLEZ and USB-SDP-CABLEZ interface connectors.
Evaluation Software HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADM1191 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-ADM1191EBZ Status: Production Evaluation Board $151.80 Yes -
USB-SDP-CABLEZ Status: Production USB to Serial I/O Interface. Required. Only one neeed for multiple eval kits. $89.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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