Microcontroller maximum current output... - Page 2 - Electronic Circuits Projects Diagrams Free

ben1son1 · 11th September 2007, 03:08 PM

The attachment is a simple driver circuit to drive the LED at 20ma with about 20ua input from chip. R1 control the max. current that the LED can draw; you can go up to about 500 ohms but the brightness LED will go down. In creasing R2 will lower the total current being draw from the chip but leaving more current for other outputs plus the brightness of the LED may go down.

BEN

Suraj143 · 12th September 2007, 05:08 AM

Yes 8051 family can add a resister from 100R onwards to their output pins.220R is a descent value.

I have seen many atmel projects they use 220R resisters to their output pins to drive LED's.

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11th September 2007, 03:08 PM	(permalink)
ben1son1	Driver The attachment is a simple driver circuit to drive the LED at 20ma with about 20ua input from chip. R1 control the max. current that the LED can draw; you can go up to about 500 ohms but the brightness LED will go down. In creasing R2 will lower the total current being draw from the chip but leaving more current for other outputs plus the brightness of the LED may go down. BEN

12th September 2007, 05:08 AM	(permalink)
Suraj143	Yes 8051 family can add a resister from 100R onwards to their output pins.220R is a descent value. I have seen many atmel projects they use 220R resisters to their output pins to drive LED's.