ARD00385

ARD00385 is a MCP3911 and PIC18F85K90 single-phase anti-tamper energy meter reference design. This is a fully functional single-phase meter with enhanced capabilities, such as battery backup, RTC and anti-tamper features. To detect the tamper condition, both currents (the neutral and the high-voltage line) must be monitored and compared to each other. The two current channels are measured with the MCP3911 device and the voltage channel is measured with the 12-bit SAR ADC integrated in the MCU. This design has two sensors for the current measurements. One is placed on the neutral and the other on the high-voltage line. The PIC18F85K90 microcontroller directly drives the LCD and communicates via UART with the MCP2200, offering an isolated USB connection for meter calibration and access to the device power calculations. The system calculates active and reactive energy, active, reactive and apparent power, power factor, RMS current, RMS voltage and the line frequency.

• Rated 5(60)A 220V 3200 imp/kWh IEC62053-22 Class 0.5 energy meter
• Calculates active and reactive energy, active, reactive and apparent power, power factor, RMS I/V
• Anti-tamper monitoring: neutral monitoring, current circuit reversal, magnetic field disturbance
• Microchip energy meter software is used to calibrate and monitor the system
• Calibration can be done in closed loop or open loop
• Low-cost capacitive-based power supply design

Contents

MCP3911 and PIC18F85K90 single-phase anti-tamper energy meter, Important information sheet.