> -----Original Message-----
> From: Derek Cowburn [SMTP:derek@COWBURN.US]
> Sent: Friday, August 02, 2002 6:25 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC] RA2 competition when using I2C Slave Mode and A2D
>
> > -----Original Message-----
> > From: Epox [mailto:spowell5@NEO.RR.COM]
> > Sent: Thursday, August 01, 2002 11:09 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [PIC] RA2 competition when using I2C Slave Mode and A2D
> >
> >
> > RA2 Competition? Red Alert 2?
>
> ha ha wizaguy.
>
> Page 69 of the pic 16f876 datasheet states that ADCON1 must be set so pin
> RA5 (not 2, sorry) is configured as digital.  The table on page 112
> indicates there are only 6 possible choices that set RA5 to digital.  This
> only allows access to 3 A/D channels max.
>
> Is there a better (low pin count) pic to use as an A/D I2C slave device
> that
> will allow me to use 4-5 A/D?
>
> -Derek
>
If current consumption isn't an issue, you can define the pin as a digital
pin, set the TRIS bit to make it an input and still be able to use it as an
analog input.  I have been using this method in a product for some time
quite successfully.  The manual even states that this will not affect
accuracy (Note 1 on page 115 of the 16F87x datasheet PDF.  Biasing a digital
pin somewhere between the rails will cause an increase in current
consumption.

Regards

Mike

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