Power-monitoring IC for single-phase AC, domestic & industrial designs

April 27, 2015 // By Graham Prophet
Microchip Technology’s MCP39F511 is a highly integrated and accurate single-phase power-monitoring IC, designed for the real-time measurement of AC power, combining the most popular power calculations with advanced features.

Microchip Technology’s MCP39F511 is a highly integrated and accurate single-phase power-monitoring IC, designed for the real-time measurement of AC power, combining the most popular power calculations with advanced features.

The device is, says Microchip, suitable for use in high-performance commercial and industrial products such as lighting and heating systems, smart plugs, power meters and AC/DC power supplies.

To address industry requirements for better accuracy across current loads, additional power calculations, and event monitoring of various power conditions, the MCP39F511 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 to higher-performance designs, this new device is capable of just 0.1 % error across a wide 4000:1 dynamic range. Its 512 bytes of EEPROM allow operating-condition storage. The MCP39F511 also includes two 24-bit delta-sigma ADCs with 94.5 dB 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 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), at $150. The MCP39F511 itself, in a 28-lead, 5 x 5 mm QFN package, is priced at $1.82 (5000).

Microchip; www.microchip.com/MCP39F511-042115a