AVR-Chat

At 05:25 PM 6/19/2007 +0000, Dave VanHorn wrote:
>   Your only delay now is how long it takes to charge that
> > cap through the resistor network - but since this is a slowly changing
> > signal (one hopes!) that shouldn't matter.
>
>
>The source resistance still matters, because the AVR inputs have
>leakage currents into or out of the pins. If the source resistance is
>large relative to that current, then the voltage on the cap will be
>affercted, or dominated, by that leakage current.
>
>Check the specs, and design to survive the maximum specified leakage.

Very good point.  I checked, the leakage was rather higher than I expected.

Robert

http://www.aeolusdevelopment.com/

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