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, [EMAIL PROTECTED] ======================================================================== Whom computers would destroy, they must first drive mad. _______________________________________________ AVR-chat mailing list AVR-chat@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-chat
