The MCP39F521 is a highly integrated, single-phase power-monitoring IC designed for real-time measurement of input power for AC/DC power supplies, providing power and energy values. 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 94.5 dB of SINAD performance on each measurement channel allows for better than 0.1% accurate designs across a 4000:1 dynamic range.Power Monitoring Accuracy capable of 0.1% error across 4000:1 dynamic rangeBuilt-In Calculations on Fast 16-Bit Processing Core Active, Reactive, Apparent Power Active and Reactive Energy Accumulation True RMS Current, RMS Voltage Line Frequency, Power FactorDedicated Zero Crossing Detection (ZCD) PinDedicated PWM Output PinAutomatic Event Pin Control through Fast Voltage Surge DetectionFast Calibration RoutinesI2C Interface512 bytes User-accessible EEPROM through page read/write commandsNon-volatile On-chip Memory, no external memory requiredLow-Drift Internal Voltage Reference: 10 ppm/°C typical28-lead 5x5 QFN packageExtended Temperature Range -40°C to +125°C