Single-Phase Power-Measurement IC with I²C Interface

The MAXQ314 is a dedicated power-measurement IC that collects and calculates voltage, current, power, and power factor for a single-phase load. The results can be retrieved by an external master through the internal I²C bus. This bus is also used by the external master to configure the operation of the MAXQ314 and monitor the status of operations.

The MAXQ314 performs voltage and current measurements using an integrated ADC that can measure voltage and current. Other values such as power are calculated from that data. The MAXQ314 also has an integrated temperature sensor that provides the die temperature on demand. The internal current amplifier produces up to 32x gain and the voltage amplifier gain is 1x.

Designers must have the following documents to fully use all the features of this device. The data sheet contains pin descriptions, feature overviews, and electrical specifications. Errata sheets contain deviations from published specifications. The user's guides offer detailed information about device features and operation.

* MAXQ314 IC data sheet

* MAXQ314 revision-specific errata sheet (Click here for availability)

* MAXQ Family User's Guide

Applications

* Single-Phase AC Power Monitoring

* High-Performance, Low-Power DSP Core

* On-Chip Digital Temperature Sensor

* Precision Internal Voltage Reference

* Active Power (W), < ±0.5% Error

* Reactive Power (VAR), < ±0.7% Error

* Apparent Power (VA), < ±0.7% Error

* Power Factor, < ±1% Error

* Voltage RMS, < ±0.2% Error

* Current RMS, < ±0.5% Error

* I²C-Compatible Serial Interface

* Continuous Output of IRMS in Serial or PWM