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BQ24770充电截止的问题

Other Parts Discussed in Thread: BQ24770, BQ24266, BQ25606, BQ25601

我按照BQ24770的User Guide设计了PCB,现在终于能充电了。但我想问一下,我观察了一整天发现电池一直在充电,并且电池电压充到4.2V后,就开始快速放电,然后放光后又在继续充电。循环往复,这是什么原因呢?

另外,我之前用过BQ24266、BQ25606、BQ25601等芯片,它们都是充满后会自动停止充电,但感觉BQ2477x系列则会一直循环充下去