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ADS1252的问题

Other Parts Discussed in Thread: ADS1252

使用ADS1252采集直流电压,采集3.3V时是正确的,当把输入悬空或者接地,还是显示有1.2V的电压,测1.2V以上的电压是正确的,测1.2V以下的电压就是1.多伏,不知道这是什么情况