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ADS8688八路自动巡检，所有通道模拟前端都开启，不使用的通道可不可以悬空不接？在不接的情况下，读出悬空端电压是2.55V左右（在量程0~5V情况下），能不能让悬空电压是0V啊？
模拟输入端, 建议还是不要悬空, 可以考虑用电阻下拉, 方便有变动是调换通道
