>You'll probably find that making a bidirectional isolated
>interface is not trivial :)

Amen to that. Look at the Philips application note AN460 about isolated I2C.
They make a special chip (P82B96) to do it, and this app note tells you why.

http://www.standardics.nxp.com/support/documents/i2c/pdf/an460.pdf


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