> Yowza!! 100 slaves?  Well, I can give you one recommendation right
> away.  IIRC the maximum recommended bus length is 10cm.

Recommended in a particular situation perhaps, but IIC has no official
maximum bus length.  The hard limits are the maximum capacitance (400pF if
recall), and the maximum sink current required to lower a bus line to logic
0 (around 3mA, again from memory).  These parameters and the maximum clock
rate will dictate the maximum bus length in your case.  Note that you get to
chose the clock rate.


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