In the specs are no distances mentioned as far as I know, only a maximum bus
capacity. Practically It will be maybe 1 meter, without problems.
If you want to increase the maximum distance you can use the "I2C bus
extender" from Philips, the 82B715. With this IC you can increase the bus
length with approx. 10 times.


Marcel



>I have read and used the I2C serial bus, on a PIC 57 and with various
>Philips devices.  The specs never mention, the likely distance that is
>possible using this bus.
>
>How far have people used it?  Does anyone know of specs for the distance
>performance of this serial bus?
>
>I realise that it is really a serial bus for peripheral devices, but it
>would be really interesting to know about experiences of using it over 10
>feet?  Or 50 feet? Then I could run it all around the house, to do all
>neat sort of stuff.
>
>Is this the communications protocol they use in BMWs, where only two
>wires run to the lights and accessories?
>
>Sorry to ask lots of questions, but this is fun stuff.
>
>regards
>
>
>Gary Gaskell                         Cooperative Research Centre for
>Research Scientist                   Distributed Systems Technology
>DSTC                                 Ph:   61 7 864 1051
>Level 12, ITE Building               Fax:  61 7 864 1282
>Queensland University of Technology  Email:  gaskell@dstc.edu.au
>Brisbane, Australia.
>_________________________________________________________________
>
>