28-V, 12-bit, I²C output current/voltage/power monitor with alert in WCSP

The INA234 device

is a 12-bit digital current

monitor with an I2C/SMBus-compatible interface that is compliant with a

wide range of digital bus voltages such as 1.2V, 1.8V, 3.3V, and 5V. The device

monitors the voltage across an external sense resistor and reports values for

current, bus voltage, and power.

The INA234 features

programmable ADC conversion times and averaging. The device also has a programmable

calibration value with an internal multiplier that enables direct readouts of

current in amperes and power in watts. The device monitors the bus voltage

present on the IN– pin and can alert on overcurrent and undercurrent conditions

as well as overvoltage and undervoltage conditions.

High input impedance while in current measurement mode allows use of larger

current sense resistors needed to measure small value system currents.

The INA234 senses

current on common-mode bus voltages that can vary from –0.3V to 28V,

independent of the supply voltage. The device operates from a single 1.7V to 5.5V

supply, drawing a typical supply current of 300µA in normal operation. The device

can be placed in a low-power standby mode where the typical operating current is

2.2µA.