Re: Flash retention in uC at higher temps, experience?

Joerg wrote:

> 50C is easy, we even get that as an ambient temperature around here. But

> in summer stuff inside of enclosures can easily reach 80C or more. Worst

> case for 10h/day all summer.

  For us, it was a non-issue above 40C, because we didn't rate the
measurement 
electronics to be within specification above that point.  We actually
could 
have gone higher, but the built-in LCD 1x16 display wasn't rated above 40.
 It 
was a nice round number so we left it at that.

>>  Our flash chips are quite ancient, and although they don't hold any 
>> critical information, it's critical enough that you're going to notice 
>> if it chucks a wobbly.

> Chucks a wobbly, cool. Learned a new expression!

  It's an oldish Australian term.  I don't know how wide spread it is, but

everyone here who I've mentioned it to knows what it implies.

>>  Although we get some with corrupt flash data, it's relatively rare.

> Depends on what "relatively rare" means ;-)

  Of the dozen or so broken boxes I used to see every week, we'd get one
with 
trashed flash data every month or so.
  I have no idea how many boxes were in service in the outside world.  I'm

guessing many hundreds, but I really have no idea as I was only involved
in 
the service side, not sales or other areas that would give me an idea of
what 
was already sold.
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