RN7302

Key features

• Metering:
• Full-wave and fundamental active energy metering; nonlinearity error < 0.1% within 5000:1 dynamic range; meets Class 0.5S and Class 0.2S active energy meter accuracy requirements
• Full-wave and fundamental reactive energy metering; nonlinearity error < 0.1% within 5000:1 dynamic range
• Full-wave and fundamental RMS, PQS apparent energy
• Active and reactive power direction indication; supports four-quadrant reactive power detection
• No-load start (creep) function with adjustable startup threshold
• Adjustable meter constant
• Fast pulse counting for active, reactive, and apparent energy
• 3-channel full-wave and fundamental active, reactive, and apparent pulse output
• Measurement:
• Full-wave, fundamental, and harmonic three-phase voltage/current RMS; measurement error < 0.2% within 2000:1 dynamic range
• Full-wave and fundamental active, reactive, RMS, and PQS apparent power; measurement error < 0.1% within 2000:1 dynamic range
• Full-wave and fundamental power factor; measurement error < 0.2%
• Line frequency measurement; measurement error < 0.02%
• 6-channel phase angle; measurement error < 0.02°
• 7-channel ADC instantaneous sample data; typical sampling rate 8 kHz
• Flexible ADC synchronous sample data buffer: 768×24-bit, 64 or 128 points per cycle for harmonic analysis
• Voltage vector and RMS; 2 types of current vector and RMS
• 7-channel zero-crossing detection with configurable threshold
• Voltage phase sequence error detection
• Voltage loss indication with configurable threshold
• Voltage sag detection; over-voltage and over-current detection
• Software library for power quality parameters: harmonics, three-phase unbalance, flicker, voltage fluctuation, voltage swell/sag, and voltage interruption
• Software Calibration:
• 7-channel ADC gain calibration
• 7-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
• Automatic DC offset calibration
• Checksum register with automatic calibration data verification
• Supports 3-wire three-phase and 4-wire three-phase configurations
• Single +3.3V supply with power supply monitoring
• Built-in 1.25V ±1% ADC reference voltage; typical temperature coefficient 5 ppm/°C, maximum 15 ppm/°C
• High-speed SPI interface up to 3.5 Mbps with write protection
• One interrupt output pin
• Operating voltage range: 3.0V – 3.6V
• Operating temperature range: -40°C – 85°C
• LQFP32 green package