>As Tony Nixon has said, the weak pull-ups are too big, you
>only need a few k ohms (typically1k - 4k7 depending on the
>buss capacitance and speed)

The I2C datasheets (any manufacturer's) dictate what speed you need to meet
in terms of rise, delay, and hold times.  I wouldn't recommend using the
weak pullups, as they are ~100K, I believe.  This would likely cause the
rise times to be out of spec, though I haven't tried it.

You'd probably be better off just spending the extra $.02 and putting
external resistors on the pins, regardless of whether or not you can
actually use the internal pullups.

--Andrew

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