RN8302 is a high-precision and low-power three-phase metering chip. It integrates 7 channels of high-precision ADC with a working voltage of 3.3V and a dynamic range up to 5000:1. The RN8302 can simultaneously measure fundamental and full-wave active power, reactive power and apparent power. It also supports calculation of power factor, RMS voltage and current, voltage and current phase angle, as well as harmonic parameters. In addition, the RN8302 provides anti-tampering functions such as neutral line anti-electricity theft detection, automatic measurement with low power consumption under full power loss, and open/short circuit detection for secondary side transformers.

Energy Metering

• Supports full-wave and fundamental active energy; within 5000:1 dynamic range, nonlinear error ＜ 0.1%, meeting accuracy requirements of Class 0.5S and Class 0.2S active energy meters.

• Supports full-wave and fundamental reactive energy; within 5000:1 dynamic range, nonlinear error ＜ 0.1%.

• Supports full-wave and fundamental apparent energy.

• Provides active and reactive power direction detection, and supports four-quadrant reactive power judgment.

• Features creepage and startup function with adjustable startup threshold.

• Adjustable meter constant.

• Provides fast pulse counting for active, reactive and apparent power.

• Supports full-wave / fundamental pulse output of active, reactive and apparent power.

Measurement

• Measures full-wave and fundamental active, reactive and apparent power.

• Provides RMS value of three-phase voltage and current for full-wave, fundamental and harmonic components.

• Offers full-wave and fundamental power factor.

• Detects voltage line frequency with measurement error ＜ 0.02%.

• Provides phase angle of each phase voltage and current with measurement error ＜ 0.02°.

• Supports 7-channel zero-crossing detection with configurable zero-crossing threshold.

• Detects incorrect voltage phase sequence.

• Provides voltage loss indication with configurable voltage loss threshold.

• Offers configurable buffer data of voltage and current waveforms.

• Supports voltage sag detection.

• Implements overvoltage and overcurrent detection.

Anti-Tampering / Anti-Electricity Theft

• Supports neutral line current measurement.

• Integrated low-power mode NVM2 for current comparison and pre-judgment; 2-level configurable threshold, power consumption less than 150μA.

• Integrated low-power mode NVM1 for low-power RMS current measurement, power consumption less than 2mA.

• Supports active reporting under full voltage loss; typical average power consumption as low as 7μA.

• Built-in open/short circuit detection for secondary side transformer.

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 value.

• Equipped with checksum register for automatic verification of calibration data.