Freescale Kinetis KM34Z256智能电表解决方案
Freescale公司的Kinetis KM34Z256 MCU是基于低功耗ARM® Cortex®-M0+内核,工作频率75MHz并集成了计量算法硬件算法单元(MMAU),支持32/64位整数乘法,除法和平方根运算,比标准等效MCU的性能提高135%,和更高成本的ARM Cortex-M4 MCU相比,性能增加35%,适用于单芯片1,2和3相电表和流量计以及其它高精度测量应用.本文介绍了Kinetis KM34Z256主要特性,框图和塔式模块TWR-KM34Z75M主要特性,框图和电路图.
The new Kinetis KM34Z256 MCU is designed for 1-, 2- and 3-phase electricity meters, and features a 75MHz ARM® Cortex®-M0+ core plus metering algorithm hardware arithmetic unit (MMAU). The solution supports 32/64 -bit integer multiply, divide and square root operations and delivers a 135 percent performance increase over a standard equivalent MCU, and a 35 percent increase versus higher cost ARM Cortex-M4 MCUs. A sophisticated analog front end (AFE) enables high accuracy voltage and current measurement from four 24-bit Sigma-Delta analog-to-digital converters (ADCs) – each with its own low-noise programmable gain amplifier. Complementing these are a precision voltage reference with low gain drift of 6 ppm/C°, a dedicated hardware block for dynamic sensor phase shift compensation, and three analog comparators for frequency detection in meters that use Fast Fourier Transform (FFT) algorithms.
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