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Re: [avr-chat] proper voodoo caps for ATmega168 (28-pin DIP)

From: Terry Karlson
Subject: Re: [avr-chat] proper voodoo caps for ATmega168 (28-pin DIP)
Date: Sun, 13 Jul 2008 08:00:54 -0400
User-agent: Thunderbird (X11/20071115)

Joe Strout wrote:
What are the recommended noise suppression capacitors for this chip? Of course I want one between VCC and ground (pins 7 and 8), but on the other side, we have GND, AREF, and AVCC (pins 22 through 20). I know that AVCC should be connected to VCC "through a low-pass filter" (means capacitor, nes pas?). And my intuition is to put a cap between AVCC and GND, but what about AREF? Should we add one there too?

The section on the ADC in the datasheet has good explanations of how to connect these pins.

Also, for power supply decoupling and other general things see Atmel's application notes:

AVR042: AVR Hardware Design Considerations
AVR040: EMC Design Considerations

-Terry Karlson

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