On Fri, Oct 30, 2009 at 9:33 AM, James Hillman
<james@industrialinterface.co.uk> wrote:
> I'm using the MSSP module on a 18F2221 as an I2C slave. The datasheet
> mentions that SMBus specific inputs can be enabled
> when the SMBus Select bit (SSPSTAT,CKE) is set, but it doesn't say how this
> affects the input voltage levels.
>
> Does anyone know what the levels change to?
>
> According to version 2.0 of the SMBus spec http://smbus.org/specs/ , input
> high is minimum 2.1V and input low is maximum 0.8V, but they might not
> necessarily be the values the PIC uses.
>
> Thanks in advance,
>
> James
>

Being a digital input on the PIC, it shouldn't make a difference
whether it is a generic input pin or an I2C input. Therefore, you
would just look at the electrical characteristics charts at the end of
the datasheet to find the min/max voltage thresholds for a digital
input pin.

--
Martin K.
-- 
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