Garst R. Reese wrote:
The connection examples for these two supply voltages all show them
externally tied together. Can they actually be separate supplies with
different voltages? I assumed they could be, but got worried when I
could not find an example.
Thanks,
Garst
They can be separate, as long as they stay within the overall limits of
the device. Tying them directly together is a bad idea if you want the
best results from the analogue section. There should really be some
filtering between the two. The current consumption of the 430 is
generally low enough (unless you pull lots of I/O pin current from Vcc)
that a 10ohm to 50ohm resistor plus a 0.1uF and a 10uF electolytic can
be used as an RC filter to the AVcc pin. With careful grounding it
woorks wonders for the ADC12 :-)
Regards,
Steve
