Lpc2000

Hello Richard,
I have such a device. Just before the MCU goes in
PowerDown it cuts 3.3V supply. In this mode on board
remains only 1.8V powering the MCU and a keyboard
controller which wakes up the MCU trough EINT pin.
The RESET pin is pulled up trough schottky diodes from
1.8V and 3.3V rail.
You need 3V level on RESET pin only if you need to
reset the MCU. You have to ensure 3V level after
releasing the RESET pin in order to have proper
initialization.
I am using LPC2214. And this scenario works fine.

Regards
Zdravko Dimitrov

--- Richard <richas@...> wrote:

> I am working on a battery powered device using the
> 2106.  I would like
> to use 3.3V supply that I can shut down and a 1.8V
> supply with low
> quiescent current.
> I believe the reset pin requires a 3V signal, if I
> shut down the 3V
> supply and go to sleep I am not sure what happens on
> wakeup.  If I
> enable the 3V supply on wakeup this would cause the
> supervisor to
> reset the micro.
> 
> I appeal to those who have been here before.
> 
> Rich
> 
> 
> 
> 
> 


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