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Lpc2000

Index last updated: 2026-04-28 23:31 UTC

Message

Re: Power Supply Sequencing - Latchup - FOLLOWUP

2005-01-19 by moostieuk

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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