Lpc2000

Richard wrote:

>Zdravko,
>    This scheme seems fine although I have run into a snag.  When the
>micro is alseep there is only 1.8V available.  The external interrupts
>are being held high (3V) until a button is pressed and we wake up.
>Unfortunatly the Vih minimum is 2.0V so we cannot pull these up to
>1.8V and expect them to work.
>I could, I suppose, use a seperate low-current 3V regulator just for
>the pullups.........
>
>  
>
Either that or use a FET to power off all but the processor core logic 
(pullups, etc).  Let the processor power down sections of the board?

TomW

-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
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