新型纯硬件看门狗电路设计分析研究

Analysis and analysis on the circuit design of a new type of pure hardware watchdog

看门狗电路是电子电路中一种非常常见的电路,常用的看门狗电路在喂狗进程工作,CPU死机的状态时,可以重新复位CPU,防止CPU跑飞。但是在一些极端条件下,看门狗进程也会挂死,例如温度过高等,此时看门狗无法重启CPU,设备死机。文章提出一种全新的看门狗电路,解决软件设备完全死机后CPU的复位问题。

Watchdog circuit is a kind of very common circuit in electronic circuit.The commonly used watchdog circuit can reset the CPU,to prevent the CPU from running when the dog is feeding the process and the CPU is dead.However,in some extreme conditions,the watchdog process will also hang up,such as excessive temperature,etc.when the watchdog cannot restart the CPU,device crash.In this paper,a new watchdog circuit is proposed to solve the reset problem of CPU after the software device is completely dead.