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SN65DP159: About I2C_EN/PIN

Sho Ogane
Genius 5575 points
Part Number: SN65DP159

Hi all.

I have some questions about I2C_EN/PIN>

1.When I2C_EN/PIN is Low, when the device read from SLEW_CTL, PRE_SEL and EQ_SEL/A0.
    I would like to the time chart.

2.Can we change high or low of I2C_EN/PIN dynamically?

3.If we don't use SDA_SRC/SCL_SRC/SDA_SNK/SCL_SNK pis, can I open this pin?

I would like to get your comment as soon as possible/

Best Regards,
Sho

  • 0
    Genius 5575 points

    Hi all.

    How about my question?
    Please let me know if you have any comments.

    My customer would like to get your answer as soon as possible.

    Best Regards,
    Sho

  • 0 in reply to Sho Ogane
    TI__Mastermind 23815 points

    Hi Sho-san,


    1. Are you looking for the time it takes to 

    2. You can change I2C_EN without having to assert a reset or do a power cycle.

    3. Tie to GND SCL_SRC/SDA_SRC, place 2k pull-ups to 5V in SCL_SNK/SDA_SNK.

    Regards

  • 0 in reply to Moises Garcia
    Genius 5575 points

    Hi Moises san

    Thank you for your quick response.
    I commented to your answer the below.

    1. Are you looking for the time it takes to 
    >>I understood that, these pins are sampled continuously, so I don't need the timing chart.
        Is it correct?

    2. You can change I2C_EN without having to assert a reset or do a power cycle.
    >>I understood that we can change I2C_EN dynamically.

    3. Tie to GND SCL_SRC/SDA_SRC, place 2k pull-ups to 5V in SCL_SNK/SDA_SNK.
    >>It is ok about SCL_SRC/SDA_SRC.In additional to your advice,
        I think that the SCL_SNK/SDA pin should be connected to the DDC_SCL / DDC_SDA pin.
        Is it correct?

    Best REgards,
    Sho


  • 0 in reply to Sho Ogane
    TI__Mastermind 23815 points

    Hi Sho-san,

    1. Yes, pins are sampled continuously, in GPIO mode you can verify the status of GPIO reading I2C registers.

    3. For DDC, we recommend snoop mode, this is SCL_SRC/SDA_SRC tied to GND, SCL_SNK/SDA_SNK are connected to SCL/SDA from HDMI connector to GPU plus 2k pull-ups to 5V. Having this snooping DP159 can monitor TMDS_CLK_RATIO and configure itself as needed. 

    Some customer, don't want to use snoop mode and prefer to control TMDS_CLK_RATIO by I2C.

    If the GPU doesn't support 5V from DDC an extra level shifter will be needed.

    Regards