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TPS71718 与 AM3356ZCZ VRTC 相连导致 VRTC 与地短路

Other Parts Discussed in Thread: AM3356

根据TMDXICE3359 中的例程;将5V电源通过TPS71718 输出1.8V 然后介入 2个1UF 陶瓷电容 并与门电路相接,产生一个 RTC _rest信号给AM3356;


但是 同一批次电路板,VRTC的电压 有时候会0.9V 有时候会1.0V  有的板子是正常1.8V,电压不正常的电路板多次开关后 会造成AM3356 VRTC引脚与GND短路。


请问是什么问题?