AREF values: what is the limit?

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flounder
 
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AREF values: what is the limit?

Post by flounder »

All references to AREF that I have seen refer to keeping the value at 5V or lower.

There is nothing that suggests that AREF is limited by the "native voltage" of the board.

This leads to the notion that both 3.3V and 5V chips can have an AREF=5V (max)

Before I fry a 3V board, I'd appreciate a clarification on this (I'm designing a "breakout" for one application and would like to know the degrees of freedom I must plan on).

Thank you
joe

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Re: AREF values: what is the limit?

Post by adafruit_support_bill »

AREF should not exceed VCC. So for a 3.3v processor, you should not exceed 3.3v.

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Re: AREF values: what is the limit?

Post by flounder »

Thank you. This clarifies something that ought to be emphasized. And isn't.
joe

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