Does anyone know why the ATXMEGA32A4-AU costs nearly $2.00 more than the ATXMEGA32A4U-AU. As far as I can tell they are nearly identical except the 32A4U part has USB yet costs significantly less.
The A4U is an A4 with all the hardware bugs fixed plus USB. So my guess is the A4 is more expensive because they're trying to phase it out.
It appears to be part of Atmel's strategy to phase out the non-U (and seriously buggy!) Xmega models. If you can buy one with USB for less than one without why wouldn't you?
It may also simply reflect the good old economic principle of supply and demand. Again if Atmel's intention is to clear the market of buggy chips then they'd presumably reduce supply of those and increase supply of the replacement. Reduced supply with equal demand means price increases, increased supply with equal demand means price falls.
It looks like we'll be migrating over to the A4U series then. And all this time I thought it was my code that was buggy :).
Well to be fair it's mainly the ADC that is FUBAR but there's a whole raft of other minor details on the original errata list too.
Will the A4U series run code for the A4 without changing it or even re-compiling the code?
Take a look through AVR1021 http://www.atmel.com/Images/doc8... and see if any of it applies to you.
Thanks, this document is very helpful.
Will the A4U series run code for the A4 without changing it
The answer is no. For example, One of the register differences between A and AU is TIMCTRL in DAC of A series, which is not present at all in AU series.
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