Flash retention in uC at higher temps, experience?

Hello All,

After some problems a client saw I was treated to my own dose of what is 
likely flash loss: The uC in our mailbox door has become erratic. I 
installed it about three months ago and half of the day it receives a 
good pelting from the sun. First it began not recognizing some keys, 
then it started doing weird stuff like lock cycling. Things it wasn't 
meant to ever do. Batteries, contacts and such look ok, reset didn't 
help, so that's not it.

TI has an app note about the topic:
http://focus.ti.com/lit/an/slaa392/slaa392.pdf

Figure 1 looks scary above the 80C range. Later they presented another 
test with a different bake cycle which makes things look better but who 
knows.

What is you experience with respect to flash errors on uC that are 
exposed to elevated temperatures as most outdoors applications are?

-- 
Regards, Joerg

http://www.analogconsultants.com/

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