Marcel van Lieshout wrote:

>Hello group,
>
>(This time with the proper subject-tag...)
>
>I saw some examples on the web parallelling PIC-pins to increase maximum
>source/sink current. Is this allowed?
>
You won't be thrown in jail.  I'm not sure what you mean by 'allowed.'

> Is it necessary to include a small
>resistor on each pin to compensate differences in pin-specifications?
>
>
As long as you can gurantee that the PIC is never run outside its
maximum specification, then Microchip says it will operate properly.  It
is not 'wise' to parallel pins for additional current, but with
additional resistors you can certianly do so in relative safety.

However, a transister is only a few pennies, doesn't take up more space
than the two resistors would (resistor + transister), and will power
vastly more current, while freeing up a pin and staying well within chip
specifications.

I can see the attractiveness of paralleling two pins for those who don't
want to touch transisters, but frankly there's little more reason than
that to do it, and I don't think that's a good reason anyway.

>Marcel
>
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>.
>
>
>

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