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BQ79731Q1EVM-060: BQ79731-VF1引脚采集误差

Part Number: BQ79731Q1EVM-060

BQ79731在做电压采集的时候使用的是VF1引脚,当高压接插件没有接的时候,VF1引脚可以采到40mV的电压,请问这是什么原因呢?电路如下图