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调试bq24650的板子,1节锂电池(4.2V),在电池电压4.0V以上充电状态下,充电灯(STAT1)在闪烁;4V以下充电正常,充电电流也正常;充电灯闪烁(STAT1)是什么原因造成,以下有示波器截图?