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Original question:

DS90UB947-Q1EVM: Altium schematic files for DS90UB947-Q1 / DS90UB948-Q1 EVM

DS90UB947-Q1EVM: DS90UB947 I2C unstable

user5006961
Intellectual 805 points
Part Number: DS90UB947-Q1EVM

Hi TI employees

My client used DS90UB947 and DS90UB948 design schemes, and found that when the cable length was more than 5 meters, the I2C signal was unstable, and theoretically it could reach 15 meters, right

  • 0
    TI__Mastermind 30515 points

    Yes, the link between UB947 and UB948 can support 15m dacar535 cable.

    For your case, pls check the cable spec. such as S11/S12 and impedance, also, pls make sure the PCLK jitter spec. is within d/s request.

    you can try the pattern test with internal clock mode, does it work?

    regards,

    Steven