Lots of decoupling on all the rails. I can't remember what the reset time is, but it's much longer (like 10 times or something - can't tell you as I'm not at work now!) than the spec says - Although the reset chip driven from the 3.3V, so it's possible that there is a problem there. We'll check it out tomorrow. --- In lpc2000@yahoogroups.com, Robert Adsett <subscriptions@a...> wrote: > At 05:13 PM 1/19/05 +0000, you wrote: > >Check your power up reset signal length, it should be at least 10ms > >(AFTER V18 is stable, check this). If it is shorter than this the > >processor may enter an "unknown state". > > Also what's your decoupling like? Marginal decoupling could give symptoms > like this. > > Robert > > > " 'Freedom' has no meaning of itself. There are always restrictions, > be they legal, genetic, or physical. If you don't believe me, try to > chew a radio signal. " > > Kelvin Throop, III
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Re: Power Supply Sequencing - Latchup - FOLLOWUP
2005-01-19 by moostieuk
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