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DS90UB927Q-Q1: no response to the interrupt signal from the DS90UB928-Q1

Sherry Liang
Genius 10255 points
Part Number: DS90UB927Q-Q1

Dear team,

Application is 927 paired with 928. Now there is a problem that the interrupt signal cannot be transmitted from 928 to 927. The process that occurs is: during normal working, it will suddenly be unable to transmit. Then testing found that 928 has an interrupt pulse, while the 927 has no signal and is always high. And this fault rate is very low. At this time, the screen display is normal, and the lock is normally high. Could you please help analyze this problem?

Thanks & Best Regards,

Sherry

  • 0
    TI__Mastermind 30515 points

    Sherry, pls check:

    This issue happens with little failure rate?

    1. INTB design is correct? pull-up, register setting..

    2. pls check if the bc has error reported in ub927 side?

    3. all boards have this issue? how about the application condition such as cable length etc.

    best regards,

    Steven

  • 0 in reply to Steven(Shenzhen) Shi
    TI__Genius 10255 points

    Hi Steven,

    They can't access to 927's register.

    From the 928 side, they can read the 928's register, but they can't read the 927's register;

    From the 927's side, they can read the 928's register, but they can't read the 927's register.

    Thanks & Best Regards,

    Sherry

  • 0 in reply to Sherry Liang
    TI__Mastermind 30515 points

    Sherry,

    now your issue is on remote I2C access issue or INTB issue?

    If it is remote I2C access issue, please check the reg. setting in both 927 and 928 side, if it is set correctly you can access ub928 through ub927.

    For the INTB issue, please check the issues I listed above. Your INTB issue is on function setting or on failure rate issue. the INTB function setting should be simple as this is one basic function for TI's FPD-Link solution, you can find out the root cause why your customer's board can't work after step by step debug suggested above.

    best regards,

    Steven