Metering

• Supports AC and DC metering.

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

• Provides full-wave and fundamental 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.

• Provides full-wave and fundamental pulse output for active, reactive and apparent energy.

Measurement

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

• Measures three-phase RMS values of full-wave, fundamental and harmonic voltage and current.

• Provides full-wave and fundamental power factor.

• Measures voltage line frequency with error less than 0.02%.

• Measures phase angle of each phase voltage and current with error less than 0.02°.

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

• Detects voltage phase sequence error.

• Provides voltage loss indication with configurable threshold.

• Supports configurable voltage and current waveform buffer data.

• Integrates voltage sag detection.

• Supports overvoltage and overcurrent detection.

Anti-Tampering

• Supports neutral current measurement.

• Low-power mode NVM2 for current comparison pre-judgment with two-level adjustable threshold; power consumption less than 150μA.

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

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

• Built-in CT secondary open-circuit and short-circuit detection function.

Software Calibration

• Supports gain calibration for 7 ADC channels.

• Supports phase calibration for 7 ADC channels; segmented phase calibration is available for Phase A, B and 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.

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

• Compatible with three-phase three-wire and three-phase four-wire systems.

• Single +3.3V power supply with power monitoring function.

• Internal 1.25V ADC reference voltage with typical temperature coefficient of 5ppm/℃; external reference voltage is also supported.

• High-speed SPI interface with transmission rate up to 3.5Mbps, with write protection function.

• One interrupt output pin available.

• Operating voltage range: 3.0V–3.6V.

• Operating temperature range: -40℃–85℃.

• Adopts eco-friendly LQFP44 package.