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TMDS181: Does I2C require the spec of STANDARD mode or FAST mode?

Motoyasu Hattori
Genius 11125 points
Part Number: TMDS181

Hi,

As the default (Power-up), I2C is set 100ksps on TMDS181.   On this mode, do customers have to meet the HW timing of STADNDARD mode or FAST Mode?   Please advise us.

Thanks and best regards,
M.HATTORI

  • 0
    TI__Guru**** 178046 points

    M.HATTORI

    Each data rate has its own timing specification as listed in Table 10 of the I2C spec that the master and slave must adhere to in order for correct data transfer.
    Thanks
    David

  • 0 in reply to David (ASIC) Liu
    TI__Genius 11125 points

    David-san,

    I have one additional question. According to I2C specification, we can find the following sentence.

    The data on the SDA line must be stable during the HIGH period of the clock. The HIGH or LOW state of the data line can only change when the clock signal on the SCL line is LOW.

    On TMDS181, does customer has to apply the above spec?  Please advise us.

    My customer can not operate access correctly. I seem he is satisfied with datasheet, but on his waveform, SCL high->low and SDA low->high is same timing.  That is why I ask you.

    Thanks and best regards,
    M.HATTORI

  • 0 in reply to Motoyasu Hattori
    TI__Guru**** 178046 points

    M.HATTORI-san

    The TMDS181 is fully compliant to the I 2C Bus Specification. The TMDS181 is always a slave, it is up to the master to initiate a data transfer on the bus and generates the clock signals to permit that transfer. So they need to make sure the master is i2c compliant.

    Thanks

    David