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BQ25895 watchdog 错误产生原因 ?

Other Parts Discussed in Thread: BQ25895

请问在什么条件下会产生 watchdog错误呢?

做实验, 没有接MCU的情况下,直接外接电源+5V 和电池, 看在默认条件下是否可以充电, 结果发现不能充 。

用MCU 去读BQ25895的错误状态, 发现是watchdong产生了, 

为什么会发生这种情况 ?  

Bill