RN8302B

The RN8302B provides full-wave and fundamental active, reactive, and apparent energy and power, supports reactive four-quadrant detection, features creep start functionality, adjustable meter constant, fast pulse counting, and pulse output. It measures full-wave and fundamental power, RMS voltage and current, power factor, line frequency, and phase angle, with zero-crossing detection, phase sequence error detection, and voltage loss indication. Anti-tamper functionality and multiple low-power modes are supported. Software calibration is supported for three-phase three-wire and three-phase four-wire configurations. Powered by a single +3.3V supply with power monitoring, built-in 1.25V ADC reference voltage, high-speed SPI interface, and interrupt output pin. Operating voltage range: 3.0V–3.6V; operating temperature range: -40℃–85℃. Available in LQFP44 green package, compliant with EU RoHS directive. The chip supports four operating modes: metering mode, total voltage loss mode 1, total voltage loss mode 2, and sleep mode. Mode switching is performed via SPI commands, and the default mode after power-on reset is configurable via the PM pin.

Applications

• Three-phase three-wire meter
• Three-phase four-wire meter

Key features

• Total-waveform and fundamental active energy measurement; nonlinearity error <0.1% over 5000:1 dynamic range; meets Class 0.5S and Class 0.2S active energy meter accuracy requirements
• Total-waveform and fundamental reactive energy measurement; nonlinearity error <0.1% over 5000:1 dynamic range
• Total-waveform and fundamental apparent energy measurement
• Active and reactive power direction indication; reactive four-quadrant detection
• Anti-creep function with adjustable startup threshold
• Adjustable meter constant
• Fast pulse count output for active, reactive, and apparent energy
• Pulse output for total-waveform and fundamental active, reactive, and apparent energy
• Total-waveform and fundamental active, reactive, and apparent power
• Total-waveform, fundamental, and harmonic three-phase voltage/current RMS values
• Total-waveform and fundamental power factor
• Line frequency measurement; measurement error <0.02%
• Per-phase voltage and current phase angle; measurement error <0.02°
• Seven-channel zero-crossing detection with configurable threshold
• Voltage phase sequence error detection
• Voltage loss indication with configurable threshold
• Flexible voltage and current waveform sample buffer
• Voltage sag detection
• Overvoltage and overcurrent detection
• Neutral current measurement
• Low-power mode NVM2 for current comparison pre-detection; 2-level configurable threshold; power consumption <150μA
• Low-power mode NVM1 for low-power current RMS measurement; power consumption <2mA
• Active full power-loss reporting; typical average power consumption of 7μA
• Seven-channel ADC gain calibration
• Seven-channel ADC phase calibration; Phase A, B, C current channels support segmented phase calibration
• Power gain calibration
• Segmented phase calibration for active and reactive power
• Offset calibration for active power, reactive power, and RMS
• Checksum register with automatic calibration data verification
• Supports three-phase three-wire and three-phase four-wire configurations
• Single +3.3V supply with power monitoring
• Built-in 1.25V ADC voltage reference; typical temperature coefficient 5ppm/℃; external reference supported
• High-speed SPI interface up to 3.5Mbps with write protection
• One interrupt output pin
• Operating voltage range: 3.0V – 3.6V
• Operating temperature range: -40℃ – 85℃
• LQFP44 green package
• Compliant with the test requirements of EU Directive (EU) 2015/863 amending Annex II of RoHS Directive 2011/65/EU