Microchip – MCP39F511: High Accuracy Power Monitoring IC with Calculation and Energy Accumulation

The MCP39F511 is a highly integrated and accurate single-phase power monitoring IC, designed for the realtime measurement of AC power. It includes dual-channel delta sigma ADCs, a 16-bit calculation engine, EEPROM and a flexible 2-wire interface. An integrated low-drift voltage reference in addition to the 94.5dB of SINAD performance on each measurement channel allows for better than 0.1% accurate designs across a 4000:1 dynamic range. Combining the most popular power calculations with unique advanced features, the MCP39F511 is ideal for use in high performance commercial and industrial products such as lighting and heating systems, smart plugs, power meters and AC/DC power supplies.


  • Built-in calculations on active, reactive, apparent power
  • True RMS current, RMS voltage
  • Automatic event pin
  • 2-wire UART: 115.2k baud rate
  • 512 bytes user-accessible EEPROM
  • Non-volatile on-chip memory
  • Active and reactive energy accumulation
  • Dedicated ZCD and PWM output pins
  • Fast calibration routines
  • 28-lead 5 x 5 QFN package
  • -40°C to +125°C temperature range
  • 5k MSRP: $1.82 US