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. - Reactive energy error less than 0.1% within 8000:1 dynamic range, compliant with IEC62053-23:2003 standard. - Provides RMS measurement for two current channels and one voltage channel; RMS error less than 0.1% within 1000:1 dynamic range. - Integrated one pulse frequency generator for energy accumulation and integration of user-defined power. - Outputs instantaneous sampling values of three ADC channels. - 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, reactive 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. - Timed freezing function of energy registers supported. - UART RX pin also serves as pin reset function. - Supports +5V / 3.3V power supply; typical power consumption: 15mW@5V, 8mW@3.3V. - Built-in 1.25V±1% reference voltage; typical temperature coefficient 5ppm/℃, maximum 15ppm/℃. - Adopts green SOP24 package. It can measure active power, reactive power, active energy and reactive energy. It also provides two independent active power and RMS values, voltage RMS, line frequency and zero-crossing interrupt, enabling flexible anti-tampering solutions. Supports fully digital correction of gain, phase and offset. Active energy pulse is output via the PF pin; reactive energy pulse or user-defined energy pulse frequency is output via the QF pin. SPI and UART serial interfaces are available for convenient communication with external MCU. The internal power monitoring circuit ensures reliable chip operation during power-up and power-down.