Lpc2000

On Fri, 27 Feb 2004 05:45:27 -0000, tsvetanusunov wrote:

>It may not be that simple. The fact that Philips has been claiming 
>there are no sequencing requirements was bothering me so I just 
>did a simple experiment. I disconnected the 1.8V supply from the 
>micro and powered it up. After the other supplies had stabilized I 
>reconnected the 1.8V supply by hand. The micro started w/o a 
>problem. I've got to refine the setup a little more but 
>straightforward sequencing is not at fault.

indeed it may be not that simple, I believe in our case Vreg rise 
time difference is matter of milliseconds.
we didn't measure rise times on +1.8 +3.3V with 10uF/47uF but this 
just solved the problem
we'll do some more experiments
Tsvetan
=================================================================
Yes.  dv/dt is a known cause for false triggering of scr's.
Another problem we had with some of the Atmel AT91's is a poor
reset of the nTRST line which caused the JTAG chain to go active
and halt the processor core.  It showed up as 3 memory accesses
to fill the pipeline, then no bus activity at all.  I have no idea
if any of this applies, just passing on observations that might
apply.

-Bill