ADM1191:  Digital Power Monitor with Convert Pin and ALERTB Output

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 ...More

ADM1191:  Digital Power Monitor with Convert Pin and ALERTB Output

Product 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 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.

Applications

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

    • Data Sheet, Rev. B, 2/08

    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 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

    Diagrams

    ADM1191 Diagram
    Functional Block Diagram for ADM1191

    浏览其他的产品

    Part# Voltage/Current Readback Basic Hot Swap Control CONV Pin CLRB Pin ALERT/ALERTB Reference Adjust Number of I2C Addresses Price* (1000-4999)
    ADM1191 X - X - ALERTB X 16 $1.92
    ADM1192 X PMOS to 30 V - X ALERT X 4 $1.92

    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    ** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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