I2C device addresses

[JimRayden]

Hi all.

Scenario:
I am trying to set up a system by the means of a I2C bus. One of the devices is an Atmel touch sensor controller (http://www.atmel.com/dyn/resources/prod_documents/AT42QT2160_DS.pdf), which has two I2C address pins, thus allowing configuring for 4 device addresses.

Problem:
I need to connect up more than 4 of these devices to the host. I am guessing some digital trickery will be necessary. I'd like to solve it with as little extra clutter as possible. An extra control line from the host hooked up to a demux is perhaps a possibility but that would destroy the idealistic world of simplistic serial communication, especially if I have over a hundred device addresses completely unused.


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Jimbo