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 reference voltage provides the reference voltage, eliminating the need for an external supply. An internal programmable voltage threshold setting allows the user to select the appropriate threshold. The internal current sense amplifier can measure currents from 5 mA to 1 A.
The ADM1191 integrates a precision current‑sense amplifier, a 12‑bit ADC and an I²C fast‑mode (400 kHz) interface. It operates from 3.15 V to 26 V and provides voltage and current readback, a CONV pin for synchronous conversion, and an ALERTB pin for over‑current notification.
The device is supplied in a 10‑lead MSOP package and supports up to 16 unique I²C addresses via the A0 and A1 pins. Detailed specifications, pin functions, timing diagrams and typical performance curves are provided in the datasheet.
| Operating voltage range (VCC) | 3.15 V to 26 V |
|---|---|
| Supply current (I_CC) typical | 2 mA |
| CONV pin input current | −2 µA to +2 µA |
| Logic low threshold (V_CONVL) | 1.2 V |
| Logic high threshold (V_CONVH) | 1.4 V |
| ALERTB output low voltage | 0.05 V to 0.1 V |
| Maximum VCC rating | 30 V |
| Maximum number of I²C addresses | 16 |
The device operates from 3.15 V up to 26 V.
Up to 16 unique I²C addresses can be set using the A0 and A1 pins.
The absolute maximum rating for the VCC pin is 30 V.
Typical supply current is 2 mA.