Recently released by Microchip is the 8-bit PIC18F87J72 microcontroller (MCU) family optimised for single-phase, multifunction smart metering and energy monitoring applications. Featuring a dual-channel, high-performance 16-/24-bit analog front end (AFE), the new MCUs provide a solution for developing meters that exceed International Electrotechnical Commission (IEC) class 0.5 performance.
The MCUs integrate 64 or 128 KB Flash program memory and 4 KB RAM, enabling time-of-use and multitariff functions, as well as a high level of peripheral integration, including an LCD driver, hardware real-time clock/calendar (RTCC) and a charge-time measurement unit (CTMU) for implementing a capacitive-touch user interface. Energy-calculation firmware, a development board and a reference design are available.
Featuring a shunt-based single-phase meter with energy-calculation firmware and GUI-assisted software calibration, the PIC18F87J72 single-phase energy-meter reference design enables calculation of active/reactive energy, forward/reverse energy, active/reactive/apparent power and RMS current/voltage. To further shorten time to market and support product differentiation, customers can reuse or customise the free firmware for their own applications.
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