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All the official basic information about I2C bus extenders (I2C over long lines) and bus isolation with Opto-isolation:
General I2C application note page 46 Slide 144 et seq

Application note AN255-2 about the same subject I2C/SMBus repeaters, hubs and expanders

The I2C bible:
Official NXP I2C user guide, a must for the TXT I2C user

Hi vleeuven,

what is the reason for you to post these sources (again)?

dt.: Aus welchem Anlass postest Du diese Quellen?

Jan

Focus on I2C bus isolation.
Nice subject