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使用F4250的SD16A遇到的问题

Other Parts Discussed in Thread: MSP430F4250

使用MSP430F4250做了一个段式液晶的温度控制器,使用SD16A的A4通道,经测试发现此通道只能工作在差分输入状态下,一旦将差分输入的负输入端接地,段式液晶就不显示了,请问这是怎么回事,该怎么解决