The main reason for doing this is that there is no room any additional
components! I need to drive a 35-40 ma coil and I would like to use nothing
more than two pins from the PIC12F629.  There really is no room for an
additional smd transistor let alone 2 diodes.  I already have a back-emf
diode across the coil.

If I always write to GPIO making sure the paired outputs are always the
same using MOVWF (as opposed to BCF/BSF) would I have any problems?  Are
people concerned with the internals of the PIC and output pins are toggled
based on register changes or are they just concerned with user code that
might not keep the paired pins in sync?  I can certainly eliminate the later.

- Dan

At 06:19 PM 11/6/2002 -0600, you wrote:
>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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