100V Power Monitor Measuring Current and Voltage with ±0.3% Accuracy

Analog Devices announced the launch of LTC2992, a new I2C system monitor that enables current and voltage monitoring for two 0V to 100V rails without requiring additional external circuitry.

Key features include ▲reduced need for resistor dividers through flexible supply power ▲single-chip solution enabling current and voltage measurement and power readout capability with three delta-sigma ADCs and one multiplier ▲versatile application support through wide operating voltage range.


The onboard shunt regulator provides monitoring capability for supply voltages exceeding 100V and negative supplies. LTC2992 measures current and voltage either continuously or on demand, calculates power, and stores all information including minimum and maximum values in registers accessible via the I2C interface.

Four GPIO pins can be configured as ADC inputs for measuring adjacent auxiliary voltages. The TUE (total unadjusted error) of measured values is ±0.3% across the full operating temperature range.

When measured parameters exceed user-configured threshold limits, alert registers and pins are flagged according to the SMBus Alert Response Protocol. The 400kHz I2C interface features nine device addresses, a stuck bus reset timer, and split SDA pins that simplify I2C optical isolation.