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TDP142: Pin11 (A0) can be connected to 1k ohm in NoN I2C mode?

user4779049
Expert 2345 points
Part Number: TDP142

Hi Team,

Please advice me ony two questions bellows.

Q1  The datasheet insits that Pin11 (A0) "When I2C_EN = 0, leave the pin unconnected. "
      On the otherhand, the refrence schematic recomends that this pin is connected to
      GND through the 1 ko ohm resister.

     Can this pin conned to GND through GND when the device is configured in GPIO mode?

 Q2. I suspect that DP specifications recomed  DP conector pin 13 and 14 (Config1 and Config2) 
       are connected to GND through 1 Meg ohm resisters respectivly.

     However, the refrence schematic recomends that  pin 14  is connected to GND through a
     5 Meg ohm resister instead of 1 Meg ohm one.

    Is the 5 Meg ohm correct value?

Mita

     

    

  • +1
    TI__Guru**** 176991 points

    Mita-san

    Please see my response below,

      Can this pin conned to GND through 1kohm resistor when the device is configured in GPIO mode?

    *** Yes,

       However, the refrence schematic recomends that  pin 14  is connected to GND through a
         5 Meg ohm resister instead of 1 Meg ohm one.

        Is the 5 Meg ohm correct value?

    *** Pins CONFIG1 and CONFIG2 of the box-to-box receptacle connector of DP upstream and downstream devices must be weakly pulled down with resistors. CONFIG1 must always use 1M ohm resistors. CONFIG2 must always use a 5M (or larger) ohm resistor if the Upstream device is a dual-mode device and supports HDMI. In other cases CONFIG2 can use either a 1M or larger resistor.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Expert 2345 points

    David-san,

    Thank you for the answers.

    I got them.

    Mita