Interfacing hardware, sensors, output drivers, chips.
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Post by droops » Sun Nov 30, 2008 1:55 am

So I read the documentation and it says that AVcc is for the Analog to Digital Converter. Can someone explain what exactly this does?

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Re: AVcc

Post by paul » Sun Nov 30, 2008 12:51 pm

The AVcc pin provides a reference voltage for the A/D converters. The Atmega 168 datasheet is the best place for detailed reference. Their ref design suggests a small inductor to keep high frequency noise off that pin.

You might also be interested in the AREF pin (marked "AR" on the BBB) and AREF (in really tiny letters on RBBB).

Check the docs at http://arduino.cc/en/Reference/AnalogReference

I wrote them so write back if you find anything confusing or with which you disagree.


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