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LP87702喂狗

user6431595
Prodigy 100 points
Other Parts Discussed in Thread: LP87702

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）

  • 0
    TI__Guru**** 308311 points
    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,
  • 0
    TI__Guru**** 308311 points
    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,