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bq24103A无法充电

Other Parts Discussed in Thread: BQ24103A

用bq24103a给两节锂电池充电,输入9V,输入端带tvs,ts端接了1.5V固定电平,开始可以充电的,用了段时间后,发现无法充电,充电灯不亮,测了Rsns(0.5欧姆)电压为零,说明没有充电电流经过,请问这个是什么原因造成的 ,该如何处理?