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ADS1015输入悬空时,采集到电压,怎么回事

Other Parts Discussed in Thread: ADS1015

如题,3v供电,输入悬空,串口读出电压为0.29V左右的电压。这个0.3V左右的电压可能是ADS1015的ESD二极管压降,但是不知道悬空的时候怎么会出现。输入一已知电压,读出的电压正确。