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BQ25606: PG引脚高电平,低电平不稳定

Part Number: BQ25606

我们设计准备监测BQ25606的PG脚,来达到监测外电是否存在的目的;当没接外电,用电池供电时,PG脚偶尔高低来回跳变,而且没有规律。请问这个现象正常吗?