From: Dave H. <dhy...@gm...> - 2006-08-16 14:57:56
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Hi Patrick, > My guess is that it the GPIO's should easily be able to source 2.7 mA, > but that's 2.7 mA more current you will be pulling through the PXA255, > so why heat up the part that (miniscule amount) more? More than what? I'm pretty sure the original schematic won't work (because I've tried something similar where I had 2 LEDs and 2 resistors, one LED connected to ground, one LED connected to +5 and an output from an inverter connected in the middle. I was trying to use the output to toggle which LED was lit, but they were both always lit. If you want to limit the current from the PXA, then the correct thing to do would be to use a transistor or MOSFET to turn the LED on or off. Then only a miniscule amount of current is needed from the processor and the bulk of the current goes through the LED/resistor/MOSFET. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |