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Re: [avr-gcc-list] measuring uC supply voltage
From: |
Joerg Wunsch |
Subject: |
Re: [avr-gcc-list] measuring uC supply voltage |
Date: |
Mon, 25 Oct 2004 09:46:42 +0200 (MET DST) |
"E. Weddington" <address@hidden> wrote:
> I don't know about being able to switch over, but FYI, the internal
> reference is not all that accurate.
FWIW, this depends on your definition of `accurate'. AFAIK, it's got
an often significant offset from its nominal voltage (which you gotta
take into account), but it is still a fairly stable reference (across
Vcc and temperature), so if your application allows for a calibration
against the actual reference voltage, it might still be usable.
--
J"org Wunsch Unix support engineer
address@hidden http://www.interface-systems.de/~j/