Subsequent to my previous question regarding watchdog timers, I am interested in deciding the RESULT of such a watchdog:
Assume I add a generic external watchdog timer to my circuit. If not toggled by my microcontroller within the watchdog timeout period, the watchdog will assert a Reset pin LOW for a few-millisecond period, then deasserts the signal.
Now, with this watchdog output signal, I have two options:
- Option A: I could apply it to the Reset pin of microcontroller
- Option B: I could connect it to the Enable-pin of my Voltage regulator which, in this case, thus resets the power for my entire circuit
My question: Are there any possible concerns with Option B? I have never seen a watchdog timer / reset-IC connected to a regulator in this fashion, whether in a watchdog timer datasheet or elsewhere. However, I find it desirable because that way, I would be able to "restart" all parts/ICs on my board, instead of just the microcontroller.