Lpc2000

Kris
 
Yes, all of those things you mentioned have been checked.  They work fine with the certain lower output current power supplies.
 
The only thing that looks different is the slew rate.
 
Thanks for your suggestions
 
Wayne

microbit <microbit@...> wrote:
Hi Wayne,

> RESET is asserted for 200 ms after the power supply voltages are
> stable, then released.  The PCB is 12 layer, controlled impedance
> design with a great deal of bypassing and filtering.

If RESET is really held low for that time, then the slew rate shouldn't
matter
AFAIK. Are you sure nRST and nTRST are sound ?
Boot pin ? Held properly while RESET is de-asserted ?
This might result in erratic entry into bootloader etc.

B rgds
Kris


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