Lpc2000

Bill/Tsvetan:
This is really impressive work/analysis and demonstrates the power of
this group. I think we all need to look at our schematics ;-) . Please
keep us all posted on any responses from Philips.
 



Hugh @  <http://www.ashling.com/support/lpc2100/>
http://www.ashling.com/support/lpc2100/ 


-----Original Message-----
From: Alaric B Snell [mailto:alaric@...] 
Sent: 26 February 2004 17:22
To: lpc2000@yahoogroups.com
Subject: Re: [lpc2000] LPC2106 code run problems?


tsvetanusunov wrote:
>>Random guess. Power supply sequencing and SCR latchup internal to the
> 
> part.
> 
> Bill, 
> 
> this is the exact source of the problem!
> adding 47uF capacitor to the +3.3V LM1117 removed the problem, it 
> seems that for whatsoever reason on these boards +3.3V rises faster 
> than +1.8V and this latch up LPC2106.
> On all our future boards we'll put 10uF to +1.8V and 47uF to +3.3V 
> regulator thus will ensure some delay on +3.3V.

*My* investigations of my strange interrupt handling problems are now 
looking into the high levels of noise I see on the /RST pin when lots of

serial I/O is happening :-)

> Best regards
> Tsvetan

ABS



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