Re: Few questions on embedded stuff

From: Joerg (notthisjoergsch_at_removethispacbell.net)
Date: 06/27/04 

Date: Sun, 27 Jun 2004 21:18:51 GMT

Hi Paul,

>>Not quite. When you design hardware, any hardware, it is necessary to
>>understand analog techniques. The faster the micro runs, the more so.
>>Else something either doesn't work as expected and the EMC test results
>>can be a huge disappointment.
>>
>>
>
>I was quite horrified about the intensity how some people in this
>newsgroup defended the use of watchdog timers. While WDTs may be
>acceptable in some cases (e.g. in high radiation space operations),
>the use of WDTs to cover up inadequate hardware EMC design is not.
>
>
Yes. I guess Guy was pretty much to the point here and I assume his
thoughts are similar to mine: A WDT is a good line of last defense but
relying on it to "clean up messes" is not good. If it ever had to come
on this event should be logged and somebody should then get to work and
find out why it came on. It's the same with airbags. If one ever was
activated that usually means a crash has occurred and we can be pretty
certain that the police will want to find out why that happened.

Regards, Joerg

http://www.analogconsultants.com