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???
02/21/12 14:51
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 		 #186106 - ESD ...
Responding to: ???'s previous message
Per said:
But have you seen anyone talk about using a watchdog to cure bad electronics?

Well, Christoph is hoping that his watchdog will fire, isn't he?

Per said:
A short magnetic field pulse millions of times our normal uT levels will induce significant voltages where you don't want - and don't expect - them to be.

Up to now Christoph wasn't talking about such events but about ESD:

Christoph said:
(Yes, being zapped with lots of ESD is part of our application, and while it's fine for the device to cease working while being zapped, it's not acceptable to keep playing dead after the zapping has stopped)


Per said:
EMI filters, trisils etc are nice. But you can still not control everything.

You need not to controll everything, but only what is expected to happen. And here it's ESD what Christoph is worrying about.

Kai Klaas

List of 44 messages in thread
TopicAuthorDate
Pointless watchdog?            01/01/70 00:00      
   Sounds Like From What You Said...            01/01/70 00:00      
      Didn't want to point fingers.            01/01/70 00:00      
         A?            01/01/70 00:00      
            Don't forget AVR            01/01/70 00:00      
               One more argument ...            01/01/70 00:00      
                  Independently testable            01/01/70 00:00      
                     Slow but critical.            01/01/70 00:00      
                        Yes            01/01/70 00:00      
                           ESD            01/01/70 00:00      
                               You can't            01/01/70 00:00      
                                 You can...            01/01/70 00:00      
                                    But emi-filter, overvoltage protection etc may not be enough            01/01/70 00:00      
                                       ESD ...            01/01/70 00:00      
                                          It's not just ESD, it's "the works"            01/01/70 00:00      
                                             I do not trust the watchdog...            01/01/70 00:00      
                                                The simpler, the more trustworthy.            01/01/70 00:00      
                                                   Less complex does not mean less probable to fail!            01/01/70 00:00      
                                                   WDT and debug breadcrumbs            01/01/70 00:00      
                                                Lightning strikes            01/01/70 00:00      
                                                   A watchdog should never be needed - but should be there            01/01/70 00:00      
                                                   A watchdog isn't a fuse...            01/01/70 00:00      
                                                      correction            01/01/70 00:00      
                                                      I just can not agree with that reasoning            01/01/70 00:00      
                                                         Oh please, don't...            01/01/70 00:00      
                                                            so?            01/01/70 00:00      
                                                Why you need a watchdog            01/01/70 00:00      
                                                   And even if you had perfect software and hardware ...            01/01/70 00:00      
                                                      Reset versus power cycle            01/01/70 00:00      
                                                         Mars Pathfinder            01/01/70 00:00      
                                                         many modern chips            01/01/70 00:00      
                                                            The problem with bidirectional reset pins.            01/01/70 00:00      
                                                               The uC in question            01/01/70 00:00      
                                                            Latchup            01/01/70 00:00      
                                                               ONLY clocked circuits?            01/01/70 00:00      
                                                                  That kitchen exhaust fan ...            01/01/70 00:00      
                                                            link...            01/01/70 00:00      
                                                               Sales talk            01/01/70 00:00      
                                                   certified applications            01/01/70 00:00      
                  Using external watchdog            01/01/70 00:00      
                     It's a feature, actually.            01/01/70 00:00      
               Wet            01/01/70 00:00      
   Featuritis...            01/01/70 00:00      
   Looking at it from another perspective            01/01/70 00:00      

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