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TMDS442 / ACK disappeared through TMDS442

K.Yaita
Guru 29720 points
Other Parts Discussed in Thread: TMDS442

Hi Team,

My customer is evaluating TMDS442 and implemented DDC(I2C) as the following.

If "read command"  is issued from Master SDA could be transfered to Slave, however ACK bit from Slave disappeared through TMDS442.
The waveform is the following.

What could I do for this issue? 
Could I have your comment?

Best Regards,
Yaita / Japan disty

  • 0
    TI__Mastermind 23815 points

    Hi Kensuke,

    Signal SDA_1 has not the expected level in ACK bit.

    As yo can see in Figure 38 from datasheet: ACK bit low level (driven by slave) should be lower than the low level when Master has control of the bus.


    Could you please send me the schematic to moises.garcia@ti.com?

    Regards