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介绍一种低成本智能仪表A/D转换器电路.根据阻容电路放电原理,利用单片机内部定时器进行放电时间的测量.在单片机时钟频率为12MHz,测量分辨率为8位的情况下,A/D转换的最长时间为256μs.
A low-cost smart meter A / D converter circuit is introduced.According to the discharge principle of RC circuit, the internal timer of SCM is used to measure the discharge time.When the clock frequency of MCU is 12MHz and the measurement resolution is 8 bits, A The maximum time for / D conversion is 256μs.