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'[AVR] ATMega flash retention lifetime?'
2006\06\27@154150 by William Couture

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I can't tell if the people on AVRFREAKS are really that dense, if they are
really all 12-year olds, or just that obnoxious.

Does anyone know where Atmel documents (and if it's not in an engineering
parameters table, it's not documented) the FLASH retention lifetime of their
ATMega processors?  The ATMega644 in particular?

I've looked in the processor manual, it's not there.  I've also tried asking
Atmel and have not received a reply.

Thanks,
  Bill

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2006\06\27@160835 by David VanHorn

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On 6/27/06, William Couture <spam_OUTbcoutureTakeThisOuTspamgmail.com> wrote:
>
> I can't tell if the people on AVRFREAKS are really that dense, if they are
> really all 12-year olds, or just that obnoxious.


Why do you feel it has to be ONE of the three?  :)

Does anyone know where Atmel documents (and if it's not in an engineering
> parameters table, it's not documented) the FLASH retention lifetime of
> their
> ATMega processors?  The ATMega644 in particular?


Unfortunately, Atmel likes to leave a lot of parameters as TBD at least
until the part is obsolete.

2006\06\27@162626 by William Couture

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On 6/27/06, David VanHorn <.....dvanhornKILLspamspam@spam@microbrix.com> wrote:
> On 6/27/06, William Couture <bcouturespamKILLspamgmail.com> wrote:
> >
> > I can't tell if the people on AVRFREAKS are really that dense, if they are
> > really all 12-year olds, or just that obnoxious.
>
> Why do you feel it has to be ONE of the three?  :)

I want to give them the benefit of the doubt.  :)

> Does anyone know where Atmel documents (and if it's not in an engineering
> > parameters table, it's not documented) the FLASH retention lifetime of
> > their ATMega processors?  The ATMega644 in particular?
>
> Unfortunately, Atmel likes to leave a lot of parameters as TBD at least
> until the part is obsolete.

Yah.  There are casual references in other documents that the
lifetime is 20 years, but no engineering data I can find lists it.
And Atmel hasn't replied to my question.

Bill

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2006\06\27@163643 by Philip Pemberton

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William Couture wrote:
> Yah.  There are casual references in other documents that the
> lifetime is 20 years, but no engineering data I can find lists it.
> And Atmel hasn't replied to my question.

I wouldn't expect them to - they never answered any of mine either.
Given the criminally poor state of their appnotes and generally poor
distribution, I'm inclined to think "keep your head in the sand" is Atmel's
corporate mantra. Or maybe it's "We're still waiting for engineering testing
for that specification". Or maybe even "There's a 21 week lead time on that
part"... :)

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