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TPS3813K33 喂狗时间问题

Other Parts Discussed in Thread: TPS3813

我在使用TPS3813K33这颗IC的时候出现如下问题:

1)软件上设置的喂狗时间是间隔1S,从VDD上电,系统开启到开始喂狗大概有十几秒时间(将reset信号脚的0R断开进行测试)

2)WDT外挂了一个电容调Twindow,算出来是22S左右

3)电路图如附件,reset信号有上拉

4)实测reset信号和WDI信号如图(不断开reset脚),每隔16S左右reset一下,这是什么原因?