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BQ25890H: REGN引脚波形异常问题

dy w
Prodigy 10 points
Part Number: BQ25890H
Other Parts Discussed in Thread: BQ25890

原理上我们把BQ25890的REGN引脚经过反向和865模组的CBL_PWR_N连接，期望实现在关机状态下插入usb充电后设备能自动开机。但是在不插入任何usb时，REGN引脚就一直输出周期性脉冲，造成设备正常的关机进程没完成就会自动重启。REGN引脚的波形如下图所示，请问不充电时这样的波形正常么？如果不正常，可能是什么原因导致的呢？麻烦帮忙解答一下，谢谢！