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BQ79631-Q1: 绝缘检测异常

Part Number: BQ79631-Q1

BQ79631做绝缘检测,使用GPIO做电压采集,将GPIO短接到地,回读的电压值应该是0,但实际上一直有40mV左右的电压存在,而且GPIO3-GPIO8都是这样,请问有什么解决方案吗?