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ilikecats567 / arduino

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Need cap on AREF on UNO #867

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
1.Observe no cap on AREF on UNO schematic
2.
3.

What is the expected output? What do you see instead?
Expect ripple free vref.

What version of the Arduino software are you using? On what operating
system?  Which Arduino board are you using?
UNO

Please provide any additional information below.
Atmel recommends cap on AREF

Original issue reported on code.google.com by bobgardner32839@gmail.com on 26 Mar 2012 at 11:49

GoogleCodeExporter commented 9 years ago 
All the Uno schematics I've looked at (original, RevG, Rev3) DO have a cap on 
Aref (over by the connector.)

Original comment by wes...@gmail.com on 31 Mar 2012 at 3:50

GoogleCodeExporter commented 9 years ago 
As westfw said there is a 100nF cap between AREF and GND. Also another 100nF 
cap between AVCC and AGND (connected to GND).

Original comment by f.vanz...@gmail.com on 17 Apr 2013 at 2:33