On 22 Oct 2004 at 19:03, JAMIE MORKEN wrote:
Hi all,
I am trying to figure out the best way to measure the 5V supply voltage for an
atmega128. I am using the 5V supply as the ADC reference voltage. The problem
I am seeing is when the 5V supply droops, the reference voltage will also
droop. For other sensors I need to use the 5V reference voltage. Any ideas on
how to solve this? Is it possible to switch to the internal 2.5V reference
while the 5V external reference is still hooked up? Thanks,
I don't know about being able to switch over, but FYI, the internal reference is not all that
accurate. I would suggest using an external voltage reference device, perhaps a 2.5V ref.
Unfortunately, I don't know a part number off hand (I'm more of a software engineer, not a EE).
HTH
Eric
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