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LP87702喂狗

根据LP87702手册描述,我使用的控制板已经将芯片的看门狗使能,WDI端口输入一个周期5hz,占空比10%的频率信号,但是通过示波器测试WDR引脚总会在每400ms的是否复位一次,请问是什么原因造成的呢?PS:我查看过英文社区关于LP87702的回到,里面提到过WDI的输入频率就是看门狗默认配置(开时间和关闭时间之和即为WDI的频率)

Johnsin Tao:

Hi从功能上看是应该这样的:WDI is the watchdog function input pin and WD_RESET is the reset output . WDI pin needs to be pulsed within a
certain timing window to avoid watchdog expiration. Minimum pulse width is 100 µs. Watchdog expiration always
causes a reset pulse at WD_RESET output,

Johnsin Tao:

Hi从功能上看是应该这样的:WDI is the watchdog function input pin and WD_RESET is the reset output . WDI pin needs to be pulsed within a
certain timing window to avoid watchdog expiration. Minimum pulse width is 100 µs. Watchdog expiration always
causes a reset pulse at WD_RESET output,

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