Is it possible for a PIC 16F628 port to get damaged ??

arunb · Joined: 08 Sep 2003 Posts: 492 Location: India

Hi,

Can a PIC port configured as an output get damaged, if I connect it to +5V source ( without a resistance).

thanks
arun

asmallri · Joined: 12 Aug 2004 Posts: 1635 Location: Perth, Australia

It depends. Provided that the voltage on the PIN is less than or equal to VDD and that the rise time is les than or equal to the rise time on VDD (to avoid latchup).
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neil · Joined: 08 Sep 2003 Posts: 128

If it is an output, outputting a 0 and you put 5V on it, you are shorting out the lower totem pole fet inside the PIC. (that's if it's not one of the open drain pins, in which case it will be dead anyway) This will almost certainly blow the transistor.

I have done this before, and all the other I/Os seem to survive. You may even find that the upper FET survives, leaving half an IO??