Metering- Supports both AC and DC metering. - Provides full-wave and fundamental active energy; nonlinear error less than 0.1% within 5000:1 dynamic range, meeting accuracy requirements of Class 0.5S and Class 0.2S active energy meters. - Provides full-wave and fundamental RMS and PQS apparent energy. - Indicates active and reactive power direction and supports four-quadrant reactive power judgment. - Built-in creep start function with adjustable start threshold. - Adjustable meter constant. - Supports fast pulse counting for active, reactive and apparent energy. - Features 3-channel configurable pulse output.Measurement- Measures three-phase RMS values of full-wave, fundamental and harmonic voltage and current; measurement error less than 0.2% within 2000:1 dynamic range. - Measures full-wave and fundamental active power, reactive power, RMS and PQS apparent power; measurement error less than 0.1% within 2000:1 dynamic range. - Provides full-wave and fundamental power factor with measurement error less than 0.2%. - Measures voltage line frequency with error less than 0.02%. - Provides 6-channel phase angle measurement with error less than 0.02°. - Offers 7-channel ADC instantaneous sampling data with typical sampling rate of 8kHz. - Flexible ADC synchronous sampling data buffer: 768×24bit, 64 or 128 points per cycle, facilitating harmonic analysis. - Provides voltage vector and RMS value, as well as two types of current vector and RMS value. - Supports 7-channel zero-crossing detection with configurable threshold. - Detects voltage phase sequence error. - Provides voltage loss indication with configurable threshold. - Integrates voltage sag detection function. - Supports overvoltage and overcurrent detection. - Embedded power quality software library for harmonic, three-phase unbalance, flicker & voltage fluctuation, voltage swell/sag and voltage interruption parameters.Software Calibration- Supports gain calibration for 7 ADC channels. - Supports phase calibration for 7 ADC channels; segmented phase calibration available for Phase A/B/C current channels. - Provides power gain calibration. - Supports segmented phase calibration for active and reactive power. - Provides offset calibration for active power, reactive power and RMS values. - Built-in automatic DC offset calibration function. - Equipped with checksum register for automatic verification of calibration data. - Compatible with three-phase three-wire and three-phase four-wire systems. - Powered by +3.3V supply with built-in power monitoring function. - Integrated 1.25V ±1% reference voltage; typical temperature coefficient 5ppm/℃, maximum 15ppm/℃; external reference voltage is also supported. - High-speed SPI interface with transmission rate up to 3.5Mbps and write protection function. - Equipped with one interrupt output pin. - Operating voltage range: 3.0V–3.6V. - Operating temperature range: -40℃–85℃. - Adopts eco-friendly LQFP32 package.General Description- RN7302 is a multifunction high-precision dedicated three-phase metering chip, suitable for three-phase four-wire and three-phase three-wire applications. - Integrates 7-channel Σ-Δ ADC, reference voltage, digital signal processing and other circuits. It can measure per-phase and combined active, reactive, PQS and RMS apparent power and energy, and output 7-channel RMS values, voltage/current vector and RMS values, 6-channel phase angles, power factor, voltage line frequency, zero-crossing detection, voltage phase sequence detection and other parameters. - Provides complete set of fundamental parameters and harmonic RMS values. - Supports multiple software calibration methods: pulse calibration, power calibration and vector sum calibration. - Flexible ADC synchronous sampling data buffer is available for convenient harmonic analysis. - Embedded software library for power quality parameters including harmonic, three-phase unbalance, voltage flicker & fluctuation, voltage swell/sag and voltage interruption. - Equipped with standard SPI interface. - The internal power monitoring circuit ensures reliable chip operation during power-up and power-down. - Can be matched with Renergy SOC RN721X as a chipset for cost-effective design of three-phase multifunction meters, multi-rate meters, harmonic meters, residual current fire detectors and other smart electric instruments. It can also work with high-speed CPU to implement multifunction meters with complete power quality analysis functions.