> > So, this can't be what's needed for a 5 vdc supply, can it?
>
> Get the Definitive I2c document from the Philips web site. It explains
> everything in plenty of detail, including how to match 3 & 5V logic.
>
> http://www.semiconductors.philips.com/buses/i2c/support/index.html
>
> and right down the bottom, almost the last link is the I2C specification.
>
thanks,

that is exactly what I needed.

(now if I can just figure it out...)

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