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TPS3420 Rest 问题

Other Parts Discussed in Thread: TPS3420

TPS3420 rest 不能拉高

输入 PB1,PB2 都为高的时候, REST 一直保持低,时间很久依然没有恢复.

更换上拉电阻也没有效果。

去掉 VCC 电源后, 重新上电 Rest 可以恢复,请问这是什么问题,有什么方法可以解决呢,谢谢!