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SN75DP139 Questions

HM
Intellectual 460 points
Other Parts Discussed in Thread: SN75DP139, TFP401

Hi,

 

I have some questions about SN75DP139.

 

1)  I don't use DDC line (SDA_SOURCE/SDA_SINK 、SCL_SOURCE/SCL_SINK).  In that case, how should I these pins?  Is it OK to leave "OPEN"?

 

2)  I don't use Hot Detect line (HPD_SOURCE/HPD_SINK).  In that case, how should I these pins?  Is it OK to leave "OPEN"?

 

3)  In case of disconnecting DDC line, can I leave OVS pin "OPEN"?  or should I set it to "High" or "Low"?

 

4)  In case of disconnecting Hot Plug Detect line, may I leave HPDINV pin set to "Low"?

 

5)  Rvsadj resistor (4.02k ohm) connect between VSADJ pin and ground?

 

6)  I understand SRC is Slew Rate setting for TMDS output.  Typically, is it used as Hi-z(open)?

 

7)  I understand I2C_EN is for enable/disable setting for internal I2C resistor.  What kind of use that I2C? (for DDC line, or setting for translation mode?)

 

8)  I2C_EN is also used HDMI / DVI connector differentiation.  In case of connecting TFP401 (TMDS Receiver),  should I I2C_EN set to "Low" (DVI)?

 

Thanks in advance.

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  • 0
    TI__Mastermind 36085 points

    Hello Hidetoshi-san,

        Since you are connecting the SN75DP139 to the TFP401, the terminals I2C_EN and DDC_EN shall be set to low (I am assuming that you don't need the DDC buffer), therefore the  the DDC I2C interface will be disabled and the SDA_SINK/SOURCE & SCL_SINK/SOURCE terminals can be left unconnected without problems (as well as the HDP terminals). 

       In the case of OVS and HPDINV, they can be left unconnected, however I suggest to use a pull-down resistor.

       Yes, the Rvsadj resistor (4.02k ohm) is connected between VSADJ pin and ground.

       The SRC is typically configured as Hi-Z, but I recommend to have the space to populate the resistors, just in case you need an extra adjustment.

    Best regards,

    Diego.