IC monitors AC power in real-time

To address industry requirements for better accuracy across current loads, additional power calculations, and event monitoring of various power conditions, the power-monitoring IC provides all of the popular standard power calculations combined with advanced features. The import and export of active energy accumulation, four-quadrant reactive energy accumulation, zero-crossing detection and dedicated PWM output have now been integrated on-chip, along with the ability to measure active, reactive and apparent power, RMS current and RMS voltage, line frequency and power factor.

Allowing for more accurate power measurements, which is critical in higher-performance designs, the MCP39F511 is capable of just 0.1% error across a wide 4000:1 dynamic range. Additionally, its 512B of EEPROM allow operating-condition storage. The power-monitoring IC also includes two 24-bit delta-sigma ADCs with 94.5dB of SINAD performance, a 16-bit calculation engine, and a flexible two-wire interface. A low-drift voltage reference, in addition to an internal oscillator, is integrated to reduce implementation costs. This unique combination of features and performance allows designers to add highly accurate power-monitoring functions to their end applications with minimal firmware development, speeding development time.

The MCP39F511 is supported by Microchip’s MCP39F511 Power Monitor Demonstration Board (ADM00667), which is available now priced at $150.

The MCP39F511 is available now for sampling and volume production, in a 28-lead, 5x5mm QFN package.