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ADS114S06差分方式测量6节串联电池请教!

Other Parts Discussed in Thread: ADS114S06

铅酸电池每节2V左右,共计6节串联后,接入ADS114S06的AINCOM、AIN0、AIN1~AIN5,共5个引脚,通过控制内部模拟开关分别选择其中两个引脚采集差分信号,发现采集电压不准,电池盒ADC芯片不共地,请教:这种接法是否因为内部保护二极管会形成回路,而造成设计失败。