AVR-Chat

Perhaps not related to your VRef problem, but I remember that on some CPU's
you MUST connect AVCC to a voltage of VCC +/- 0.1V or something.
Otherwise BAD things will happen !

/Jesper



Am a bit disappointed in the accuracy of the internal 2.56 volt
reference used by the A/D converter. Have a nice 3.3 volts on the chip
supply. A 0.1 uF ceramic cap across AREF and GND. Nothing connected to
AVCC.

Working the math backwards agrees with the voltage measured across the
0.1 uF capacitor, that my reference voltage varies from 2.44 to 2.60 on
different units.

Is this typical?

-- 
David Kelly N4HHE, dkelly@HiWAAY.net
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Whom computers would destroy, they must first drive mad.