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Re: [avr-gcc-list] output current for ATMega128 on output pins

From: Joerg Wunsch
Subject: Re: [avr-gcc-list] output current for ATMega128 on output pins
Date: Tue, 7 Jun 2005 22:49:56 +0200 (MET DST)

Torsten Mohr <address@hidden> wrote:

> I'd like to drive some LEDs.

In addition to the other comments, also have a look at the diagrams.
For driving a LED, you don't have to care about maintaining the
correct logic levels, but you have to care about the allowed total
power dissipation.  Note that at Vcc=5V, the ATmega128 is one of the
few AVRs where you will exceed the allowed per-pin current when
connecting a LED directly against GND without a resistor.  For most
other AVRs, this is still within the specs (and even for the
ATmega128L at Vcc=3V).

cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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