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arunb
Joined: 08 Sep 2003 Posts: 492 Location: India
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Is it possible for a PIC 16F628 port to get damaged ?? |
Posted: Tue Dec 21, 2004 8:05 pm |
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Hi,
Can a PIC port configured as an output get damaged, if I connect it to +5V source ( without a resistance).
thanks
arun |
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asmallri
Joined: 12 Aug 2004 Posts: 1634 Location: Perth, Australia
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Posted: Tue Dec 21, 2004 11:43 pm |
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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). _________________ Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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neil
Joined: 08 Sep 2003 Posts: 128
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Posted: Wed Dec 22, 2004 6:02 am |
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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?? |
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