[SML] Sensor Dimmer Problems

[Dan Sheehan]

Had a product with cal data and some user data in EEPROM.
I did the power-on-self-test / on-board-diagnostics code for the product.
Protected the EEPROM data with a cyclic redundancy check
(like a checksum but heavier math, resistant to errors
manifesting themselves as multiples of powers-of-2,
which could escape linear checksum)
Had a persistent problem with a small percentage of
EEPROM errors detected by the CRC during burn-in
which included power cycling.
Not sure we ever really got to the bottom of it...
maybe changed vendor of EEPROM ?
Hard to control what happens *during* power-on and -off transitions.

On Thu, Mar 31, 2016 at 9:06 PM, Jerry Durand via Stagecraft <
stagecraft at theatrical.net> wrote:

> Memory is transitory.  "Non volatile" memory such as eeprom actually
> slowly loses it's mind over time.  So, assuming no glitches or other such
> errors, memories will eventually start forgetting things a bit at a time.
> This time can range from fairly short (like 10 years for a brand new part)
> to much longer times like 100 years for "quality" memory.
>
>
>>
> --
> Jerry Durand, Durand Interstellar, Inc.  www.interstellar.com
> tel: +1 408 356-3886, USA toll free: 1 866 356-3886
> Skype:  jerrydurand
>
>
>
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-- 
...Dan Sheehan
Fixer of things that break
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