Digital current power monitor IC from TI

14th October 2008

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Datasheet

Texas Instruments has introduced a zero-drift, bi-directional current/power monitor integrated circuit with an I2C interface. Featuring highest accuracy and smallest size, the INA219 monitors the drop across a shunt resistor and senses the shunt supply voltage, while also calculating power. The device is available in a SOT23 package, offering a compact and cost-effective solution for digital current sensing for servers, notebook computers, power supplies, battery management, as well as automotive and telecom equipment.

The INA219 delivers one percent maximum accuracy over the -40C to +85C temperature range, with 100 uV maximum offset. This accuracy, combined with 12-bit resolution, enables customers to use the lowest possible voltage drops across current shunt resistors, thereby minimizing power losses, dissipation and board space. The device senses bus voltages from 0 V to +26 V.

Other key features of the INA219 include the following:
* Programmable calibration register for direct reading of current in units of amps and power in units of watts
* Programmable averaging of up to 128 samples for filtering in noisy environments
* Timeout on the I2C interface to prevent bus lock-up and a high-speed mode for communications up to 3.4 MHz
* All features of the INA219 are software programmable
* Operates from a single +3.0 to +5.5 supply voltage

The INA219 is optimized to work with TI’s MSP430 ultra-low power MCUs, various hot-swap controllers, such as the TPS2490, and many of TI’s power management ICs and regulators.