Of course you could put a diode on each output, though I don't really think
that is the best design. Using a transistor to jump the current up from a
single pin is probably the best way if you have to have more current. If its
is just something you are playing with (doesn't have to be extremely
dependable), tie them together & see what happens. If you write your code so
that those two pins should ALWAYS match, I can't imagine that you would ever
have a problem with opposing logic states.

Steve

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tony Nixon
Sent: Wednesday, November 06, 2002 5:07 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: Using 2 outputs in parallel for higher current?


Daniel Rubin wrote:
>
> I know the output current limit per pin on the PICs is 20 ma... what if
> I combine 2 output pins to supply 40 ma of current?  Can it be done and
> more importantly should it be done?  If so would you just tie the 2
> pins together in the circuit?
>
> Many thanks
> - Dan



It could be done, but you run the risk of opposing logic states existing
between the pins causing a short.

--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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