Single-phase electricity meter reference design based on Kinetis microcontroller to be introduced


Austin, TX, U.S.A. — (METERING.COM) — March 2, 2011 – A smart meter reference design providing a high performance solution for power measurement in single-phase, two-wire installations targeted at the residential metering market is to be introduced by Freescale Semiconductor.

The MK30X single-phase electricity meter reference design, which is expected to be available in mid-April, aims to address the accuracy and cost needs of a modern metering solution by providing efficient analog-to-digital converters (ADCs) combined with an embedded programmable gain amplifier (PGA) to increase the accuracy of energy measurement, along with a cost effective shunt sensing circuit implementation and bill of materials (BOM).

At the heart of the MK30X reference design is the 32-bit Kinetis MK30X256 MCU based on the ARM® Cortex™-M4 core. This powerful core’s effective support of 32-bit math enables fast Fourier transform (FFT)-based metering algorithms, which calculate metering quantities from elementary voltage and current harmonics. This calculation approach results in the precise accuracy of the reactive energy, as compared to other known metering algorithms.

The MK30X reference design includes a 128 bit unique identification and FlexMemory that provides every meter with an individual identifier and tamper detection. Firmware based on an MQX™ real-time operating system enables customers to design electricity meters based on their unique requirements and is well-suited for use in advanced markets.
“Our Kinetis line is the most scalable portfolio of ARM Cortex-M4 MCUs in the industry,” said Bruno Baylac, director and general manager of Freescale’s Metering, Medical and Connectivity Solutions business. “Our MK30X single-phase electricity meter reference design further demonstrates the versatility of the Kinetis line, as well as our commitment to providing accurate, cost-effective and customizable solutions for the smart energy market.”

Customization is available using the built-in LCD, which provides the standard metering values. The designer can choose any of the measured values by clicking on the device’s built-in buttons. The designer is also able to choose from several types of communication interfaces for remote collection of data. One option is connection to a ZigBee® network via an I2C interface, meaning the meter can easily be enabled as part of a smart grid network. The meter is also able to connect outside of the home via SCI/SPI for last-mile communication.