Re: [Gumstix-users] max current output of io

[<tim...@co...>]

I agree, but their is no easy connection for vcc.
I am connecting to the 20 pin solder pads on
the STUART board.  And only GND is available.

The spec does say +/- 10 mA or +/- 3 mA
depending in which GPIO used.

 -------------- Original message ----------------------
From: kris duff <t_...@ya...>
> If I could give you a small advice, when connecting
> LED  to any microcontroller/microprocessor, I prefer
> to plug them in sinking mode.  So, you plug the LED to
> the power (VCC).  You have to activate the LED using a
> logical 0.  So the device sink the current.  It's
> easyer of the device to sink than to power the LED. 
> Usually, the device can sink more current than drive.
> 
> 
> --- tim...@co... wrote:
> 
> > Here is the 20 pin connector chart:
> > http://docwiki.gumstix.org/20pin_connector_chart
> > 
> > My question is what are the max current drive of
> > each I/O?
> > I connected some signals to some LEDS via 390 ohm
> > resistor.
> > I can see that some outputs glow brightly and others
> > are
> > dim.  The spec says their are 2 different drives, 10
> > and 3 mA.
> > 
> > 
> >
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