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Topic: 328p @ 16MHz and 3.3V? (Read 2507 times) previous topic - next topic


Sep 17, 2012, 06:17 am Last Edit: Sep 17, 2012, 09:03 am by pico Reason: 1
I know the data sheet says you really should have something like at least 3.6V Vin to power a 328p @ 16MHz, but I've got a little "pro mini" style clone board that seems to doing just fine running on 3.3V.

Anyone else have experience/thoughts/comments about running at 16MHz with only 3.3V? I'm finding this quite useful, in some applications it can simplify a lot of things, if it really turns out to be as solid as it seems...
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ATmega's are overclocking-friendly, the undervolting of 0,3V should be no problem. I made some tests with that setting and all of these passed without problems. But make sure that you run your board under the worst case temp specs of atmel.


I have a view jeenode running 16@3.3 without a problem,
Take a look at


The Seeeduino folks have in their standard 328p clone board a manual slide switch which can force the board to be powered either at 5 or 3.3 volts, both operating at 16Mhz, so I don't think you will see a problem exceeding the Atmel's datasheet speed Vs Vcc spec.


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