Features

1.Metering

n Less than 0.1% error in total and fundamental active energy over a dynamic range of 5000：1, meet the accuracy requirement for the class 0.5S and 0.2S active electrical energy meter of the national grid.

n Less than 0.1% error in total and fundamental reactive energy over a dynamic range of 5000：1.

n Total and fundamental apparent energy.

n Active and reactive power orientations, four-quadrant reactive judging.

n No-load and startup function, adjustable startup threshold.

n Adjustable electrical energy meter constant(EC).

n Fast pulse count of the active, reactive and apparent powers.

n Total and fundamental active, reactive and apparent CF frequency outputs.

2.Measurement

n Total and fundamental active, reactive and apparent powers.

n Three-phase total, fundamental and harmonic Voltage RMS and current RMS.

n Total and fundamental power factors.

n Less than 0.02% accuracy of voltage line frequence.

n Less than 0.02°resolution of fundamental voltage and current phase angle for each phase.

n Seven channels zero-crossing detection and settable zero-crossing threshold.

n Voltage phase sequence error detection.

n Loss of voltage indication and settable loss of voltage threshold.

n Flexible voltage and current waveform buffer data.

n Voltage sag detection.

n Overvoltage and overcurrent detection.

3.Anti-tampering

n Neutral current measurement.

n A low power dissipated mode NVM2 for the current comparison and pre-judging. Settable two levels of threshold and less than 150μA of power dissipated.

n A low power mode NVM1 to implement the low power current RMS measurement, and less than 2mA of power dissipated.

n Transformer open-circuit and short-circuit detection function at the secondary side.

4.Software Calibration

n Channel gain calibration of seven ADCs, and compatible with the power calibration method.

n Channel phase calibration of seven ADCs, current channel A, B and C support per-phase calibration.

n Power gain and phase calibration.

n Active, reactive and RMS offset calibration.

n Checksum register to check the calibration data automatically.

5.Compatible with three-phase three-wire system and three-phase four-wire system.

6.3.3V signle power supply with power monitoring function.

7.On-chip 1.25V ADC reference voltage, typical 20 ppm/℃ of temperature coefficient, connectable reference voltage externally.

8.High speed SPI interface with transmission rate up to 3.5Mbps and write protection function.

9.One interrupt pin.

10.Operating voltage range: 3.0V - 3.6V

11.Operating temperature range: -40℃ - 85℃

12.LQFP44 package is adopted.