The Microchip MCP39F521 is an Energy Metering IC designed for real-time measurement of input power in single-phase applications. The integrated design offers power monitoring accuracy of 0.1% error and less across a 4000:1 dynamic range.

Active, Reactive and Apparent Power
True Root Mean Square (RMS) Current and RMS Voltage
Line Frequency and Power Factor

Power Monitoring Accuracy of 0.1% Error Across 4000:1 Dynamic Range
16-bit Calculation Engine
512 Bytes User-Accessible EEPROM
Flexible I2C Interface
Low-Drift Internal Voltage Reference, 10 ppm/°C Typical
64-bit Wide Import and Export Active Energy Accumulation Registers
64-bit Four Quadrant Reactive Energy Accumulation Registers
Signed Active and Reactive Power Outputs
Dedicated Zero Crossing Detection (ZCD) Pin Output with Less than 100 μs Latency
Automatic Event Pin Control through Fast Voltage Surge Detection, Less than 5 ms Delay
Two Independent Registers for Minimum and Maximum Output Quantity Tracking
Fast Calibration Routines and Simplified Command Protocol
Low-Drift Internal Voltage Reference, 10 ppm/°C Typical

Energy/Power Measurement - Microchip