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Thread: Protection of I2C inputs on XMC1000

  1. #21
    Hi Jason,

    We managed to test with 360ohm series register and 10K pull-up.
    From our test, the communication is working fine.
    Currently we only test with 10k pull up as that is what available on our test board.
    We did not try with 4.7k pull up yet, so I can't really comment on the behaviour if 4.7k is used.
    Let me see what I can do to test it with 4.7k pull up.
    I will update you on our result.

  2. #22
    Beginner Beginner longtimer is on a distinguished road
    Join Date
    Jun 2014

    Sorry, to make it clearer, can you show me a diagram of your test setup so that we are comparing similar setups? Do you have a XMC2Go on the same bus as a 16 pin XMC1100 chip with another chip acting as the 12C master?


    Last edited by longtimer; Nov 15th, 2014 at 07:34 AM.

  3. #23
    Hi Jason,

    We use XMC1200 as Master and directly connected with XMC1100 TSSOP16 as slave.
    The Master will send a read request and Slave return with a data.
    Click image for larger version

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    Can you give it a try by just connecting to one slave instead of two?
    This could narrow down the finding of the root cause.

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