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Original question:

UCD9090A: Programming to ProgramFlash vs DataFlash

UCD9090A: read command failed

Ben Kuo
Expert 6715 points
Part Number: UCD9090A

Hi Team,

We faced to an issue when read register value. We can write byte but rad value is always FF.

Compare to other projects, we find byte to byte need some delay time.

Is byte to byte delay must to have? Could you let me know if there are related information from datasheet?

Below are waveform for failed and successful case.

Read ok

Read Failed

Ben

  • +1
    TI__Guru 58100 points

    Hi

    I2C master must support clock stretching in order to have a reliable communication. 

    The master is required to read back the clock signal after releasing it to the high state and wait until the line has actually gone high.

    Regards

    Yihe