> Olin, May I clarify?
>
> OLin means that it will work fine as long as you do NOT drive the
> Master's clock to a higher level than 3.3V. Standard IIC standards call
> for both the CLK and SDA to be pulled up.

Yup.

> Many people (including myself) drive the CLK to both rails for greater
> speed.

Bad idea.  Slaves can drive SCL too during clock stretch.

If you're going to use IIC, I would adhere to the standard unless they are
all your own devices and you know exactly what you are doing.  Of course
in that case it's not IIC anymore.


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