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Last Post 02 Mar 2006 03:15 PM by  kurtl@logicpd.com
i2c header 5485EVB
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tmloos
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--
02 Mar 2006 03:03 PM
    I am wondering if there are any know issues with the
    i2c header J22 on the main board.

    I wired in a Microchip 24LC256 eeprom and ran
    i2cdetect 0 in Linux and did not see the part at
    address 0x04 where I expected. I did see the rtc part
    at address 0x32.

    I was able to run i2cdump 0 0x32 and see the rtc
    registers without the 24LC256 wired in. I then tried
    to run i2cdump 0 0x32 with the 24LC256 wired in to
    J22, with no power, and now i2cdump 0 0x32 hangs, with
    or without the 24LC256 wired in at all. I wonder if the rtc is
    corrupted now...

    I should be able to at least see the 24LC256 part show
    up at the wired in address of 0x04, even without a
    specific driver installed.

    Thanks,
    Tom
    kurtl@logicpd.com
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    Posts:


    --
    02 Mar 2006 03:15 PM
    tmloos,

    No known issues with the I2C interface. Sorry you are having troubles. Couple things you can check which may help the situation:
    - Verify CLK and Data line are connected properly
    - Verify GND connection between EVB and Microchip part
    - Verify Microchip part is powered with ~3.3V
    - Check to see how A0, A1, A2 are tied which dictates I2C address

    When communicating to the part does the I2C ACK signal occur when its addressed properly?
    -Kurt
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