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akidder

1519 Posts
Posted - 29 Dec 2004 :  10:24:54  Show Profile  Email Poster
I2C Bus on ADS Products

I2C bus ("I two C", also known as the "Inter-IC Bus" or "I Squared C") is commonly used to interconnect integrated circuits (ICs) in electronic systems. ADS products use the bus for a few internal purposes, and some (eg. BitsyX, AGX, VGX) expose the bus for communicating with off-board devices.

    Software
    Windows CE: topic 1402
    Linux: see code used to communicate with the real-time clock



    Bridging to 5V I2C Buses

    The I2C bus on ADS products runs at 3.3 volts, while some I2C buses run at 5V. Resistive bridges between buses can't be used primarily because the bus voltage exceeds the absolute maximum ratings for XScale GPIOs (3.6V, with an absolute maximum of 4.0V). The lower resistance from parallel pull-ups may also exceed the I2C current draw specs.

    Section 18.1 of the Philips I2C spec diagrams the recommended (and clever) method for bridging between busses of different voltages. This Philips page also describes the circuit
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