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From: Spehro Pefhany
Subject: Re: Need design suggestions re. High Rel. products
X-Newsreader: Forte Agent 1.93/32.576 English (American)
Date: Sun, 19 Jan 2003 04:14:51 GMT
NNTP-Posting-Date: Sat, 18 Jan 2003 23:14:51 EST
On 18 Jan 2003 19:33:48 -0800, the renowned email@example.com (Scott
>I'm working on the design of some micro-controller (8051 series) based
>products that will be required to operate 24/7 for years on end. Have
>just implemented a watchdog . . . would greatly appreciate any
>specific thoughts of additional things to keep in mind, or any other
>advice based on your experience.
>Any suggestions of books, online resources, etc. which might be
I do this sort of thing quite frequently. You'll want to refresh all
the stuff that gets set up at power-up periodically, if you're using
C you should look carefully at the startup code as well as the micro
datasheet itself. Check the stack pointer now and then and reset if
it's not where it should be. Good power supervisory subsystem- don't
cut corners there. Proper EMC design to prevent problems. Of course
you'll want at least one WDT, make sure you're properly applying it
too. See some of the old Intel 8051 application notes for ideas-
anything dealing with extreme EMI environments is helpful.
"it's the network..." "The Journey is the reward"
firstname.lastname@example.org Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
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