Lpc2000

Hello Robert and group,

we used different devices of the LPC2000 family and different startup 
times / sequences and did not see any dependence which power was up 
first. At this point in time I can not exclude the theoretical 
possibility of a too fast or too slow rise time however, we did not 
see problems in our tests nor in simulation. 

In a nutshell, all tests and simulations we did were successful, 
meaning the device started up without latching up.  

Best regards, Robert


--- In lpc2000@yahoogroups.com, Robert Adsett <subscriptions@a...> 
wrote:
> There is an opportunity here for Philips to step in if they have 
found out 
> anything about this.
> 
> At 01:12 AM 7/12/04 +0000, you wrote:
> <snip>
> >3) Robert (messages 1256, 1281, & 2536) and Bob (message 2533) say
> >they have made tests which were not able to reproduce a supply
> >sequencing problem.
> >
> >Do you feel that you have also ruled out supply rise time as the
> >problem?
> 
> Not absolutely, but likely.  If the problem is the power supply 
rising too 
> fast than simply switching it on to the micro after it has 
stabilized 
> (essentially what I did) will give a fast and rather dirty edge.  
If it's 
> too slow than adding extra capacitance (what Tsvetan did) will slow 
it down 
> and presumably make the problem worse.  Mine was a quick and dirty 
test but 
> it ruled out a simple sequencing explanation.
> 
> 
> 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