Best way to protect CPU I/O pins from outside world

Thread Starter

fastwalker

Joined Jun 24, 2009
38
Hi All,

If I have a digital input line going to a microcontroller that I'd like to take out to a terminal for hooking up an external signal, what extra circuitry is it good to add to prevent voltage spikes etc. coming in on that signal and damaging the CPU.

Thanks
 

retched

Joined Dec 5, 2009
5,208

bertus

Joined Apr 5, 2008
21,330
Hello,

An other option is the use of optocouplers.
Optocouplers can make a safe barrier between the "bad" world and the MCU.
It is also possible to seperate powers with them.

Bertus
 
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