Re: [avr-chat] (no subject)

[David Kelly]

On Thu, Nov 29, 2007 at 02:40:08PM -0500, David VanHorn wrote:
>
> Generally speaking, microcontroller I/O pins are not designed to drive
> much more than 1-2 mA

Research your specific uC but when I've looked in datasheets every AVR I
checked would source or sink 30 mA from most every pin I wondered about.

Another data sheet mentions, and makes use of, the ability of the
protection diodes of handling 1 mA. Was being used to handle very high
voltages. I never felt safe using that but might be practical to drop 5V
signals down to 1.8V inputs using only a series resistor if the current
is limited to less than 1 mA.

-- 
David Kelly N4HHE, address@hidden
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Whom computers would destroy, they must first drive mad.