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Discussion Boards > Active Subjects > Messages as Posted > Electronics And Computers Forum

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 11-27-2010, 19:21 Post: 175382
kwschumm



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  Volvo Display problems

Reset circuits can be very sensitive to voltage levels and voltage rise time at power up. Reset and power-up logic has become one of the major PIAs of working on electronics so problems in that area wouldn't surprise most EEs.






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 11-27-2010, 19:38 Post: 175384
kwschumm



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  Volvo Display problems

Well, I don't know anything about the Volvo display board.

But every new board design I work on seems to have problems with the reset circuit where parts on the board don't power up properly except under certain circumstances. Sometimes new boards have to be run off of regulated bench power supplies until they get the kinks out. Often voltages too low, power domains don't power up in the proper sequence, voltage is out of regulation, voltage doesn't come up fast enough, etc, etc. The reset circuits on a lot of boards seem to have a gray area where if the voltage is low it works, if the voltage is high it works, but if it's somewhere in between the behavior is erratic.

So I guess what I'm saying is it wouldn't surprise me a bit if the Volvo display panel wouldn't power up correctly under certain circumstances.






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