Take the following simple circuit:
PIC pin set high --> resistor --> LED --> ground
Now here's what I'm curious about:
The datasheet cites the maximum current for an I/O pin as 25 mA.
What I think is a little strange about this is that you can power the
PIC at different voltages; I mean if the PIC's powered by 5 V, then 25
mA equates to a power dissipation of 125 mW. However if you run the PIC
at 3 V, then 25 mA means a power dissipation of only 75 mW.
If you're allowed source 25 mA when running at 5 V, then should you not
be allowed to source 41 mA when running at 3 V? (41 = 25 * 5 / 3)
Just a thought.
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