Metering Functions- Equipped with three channels of Σ-Δ ADC. - Active energy error less than 0.1% within 8000:1 dynamic range, compliant with IEC62053-22:2003 standard. - Provides RMS measurement for two current channels and one voltage channel; RMS error less than 0.1% within 1000:1 dynamic range. - Built-in one pulse frequency generator for energy accumulation and integration of user-defined power. - Adjustable creep threshold. - Reverse power indication supported. - Voltage channel frequency measurement available. - Voltage channel zero-crossing detection supported. - Internal reference voltage monitoring function built-in. Software Meter Calibration- Adjustable meter constant (HFConst). - Supports gain and phase correction. - Provides offset calibration for active energy and RMS values. - Accelerated calibration function for small signal metering. - Automatic verification function for configuration parameters.General Features- SPI / UART communication interfaces provided. - Integrated power supply monitoring function. - Single +5V power supply; typical power consumption is 15mW. - Built-in 2.5V±1% reference voltage with typical temperature coefficient of 5ppm/℃. - Adopts green SSOP24 package. It can measure active power and active energy, while providing two independent active power outputs, current RMS, voltage RMS, line frequency and zero-crossing interrupt signals, enabling flexible anti-tampering solutions. Supports fully digital correction of gain, phase and offset. The active energy pulse is output via the PF pin, and the user-defined energy pulse frequency is output via the QF pin. Dual serial interfaces SPI and UART are available for convenient communication with external MCU. The internal power monitoring circuit ensures reliable chip operation during power-up and power-down.