> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Gordon Williams
> Sent: 08 December 2006 02:49
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] ADC voltage mismatch problem
> 
> 
> Peter,
> 
> Why can't the boost be driven off of an IO pin?  Is there a 
> current problem?
> 
> Vbat
> -----|>-------|>-------- Vboosted
>          |          |
>          =          =
>          |          |
> ----------          _ GND
>  Pic io
> ON 3.3 V to 5 V
> OFF 0 V

Yes there is a current problem though not in the sense you might think

the pic is drawing its current from vboosted but the pic is also essentially trying to supply the current for vboosted.





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