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BQ500210复位问题

Other Parts Discussed in Thread: BQ500210

 图中看出BQ500210电路采用外部复位电路,Q4(MOS管)周围的电路与芯片BQ500210的5脚RESET和6脚LOBAT构成,在什么条件下可触发复位?Q4(MOS管)的作用是什么?具体的原理还不太清楚,可以讲一个具体进入复位的情况吗?谢谢!