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High Current PIC
Posted: Fri Oct 11, 2013 6:11 am
by Bobw
I was looking at the Microchip.com web site to see if there was a pic that has a higher amperage rating (16F1827 is rated to 25ma) on the output pins.
I only want to drive some LEDS (200ms on max) but I am pushing close to 65 ma per led set. I would rather not have to use switching transistors.
I was not able to find a way to search on the max pin output in ma parameter.
I am looking for a chip that FC 5.5 will support.
Any ideas besides looking a spec sheet after spec sheet.
Bob
Re: High Current PIC
Posted: Fri Oct 11, 2013 10:47 am
by Kenrix2
I don't know of any PIC micro that has that high of a current rating on a single pin. If you could care less about reliability and completely ignore the maximum ratings you could try paralleling all of port B on that chip and see what happens. The Flowcode output icon does have a write to the entire port. I think I would try a pull method first rather than a push though.
Re: High Current PIC
Posted: Fri Oct 11, 2013 11:29 am
by Benj
Hello,
I'm not aware of any device which can source or sink this much current. As Kenrix says you can couple up multiple pins but I think there is an overall limitation per port of around 100mA.
16F877A specifics.
Maximum output current sunk by any I/O pin..........................................................................................................25 mA
Maximum output current sourced by any I/O pin ....................................................................................................25 mA
Maximum current sunk by PORTA, PORTB and PORTE (combined) (Note 3)....................................................200 mA
Maximum current sourced by PORTA, PORTB and PORTE (combined) (Note 3)...............................................200 mA
Maximum current sunk by PORTC and PORTD (combined) (Note 3) .................................................................200 mA
Maximum current sourced by PORTC and PORTD (combined) (Note 3) ............................................................200 mA
There is an article on the subject here but this does use transistors. Can I ask why your against using them so I can better understand what your after?
http://www.matrixmultimedia.com/article.php?a=52
Re: High Current PIC
Posted: Fri Oct 11, 2013 2:30 pm
by Bobw
Ben,
That is kind of what I thought after looking at several spec sheets last night.
Can't use the entire port, need about 8 outputs. I have some small transistors I can use.
Thanks
Bob