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TFP410: RGB666 to HDMI data mapping and design for pin EDGE/HTPLG

louis.chang
Prodigy 240 points
Part Number: TFP410

Hi Sirs

We plan to use TFP410 to transfer RGB666 to HDMI signal.

So according to datasheet, I should use DATA pin 0~5 for Blue 0~5, DATA pin 8~13 for Green 0~5, DATA pin 16~21 for Red 0~5, right? Unused DATA pin to ground?

Another question is about Hot plug (pin EDGE/HTPLG), we paln to use a level shifter to transfer HDMI hot plug pin to 3.3V, then connects to pin EDGE/HTPLG, is that ok?

If this works, 1K series ohm still necessary?

Thank you

  • 0
    TI__Mastermind 37840 points
    louis.chang said:
    So according to datasheet, I should use DATA pin 0~5 for Blue 0~5, DATA pin 8~13 for Green 0~5, DATA pin 16~21 for Red 0~5, right? Unused DATA pin to ground?

    Yes this is correct 

    louis.chang said:

    Another question is about Hot plug (pin EDGE/HTPLG), we paln to use a level shifter to transfer HDMI hot plug pin to 3.3V, then connects to pin EDGE/HTPLG, is that ok?

    If this works, 1K series ohm still necessary?

    Yes the Level shifter will work, you will still need the 1k series resistor, but only if you want to use the pin for hot plug detection. However this is only needed if you are using I2C mode.

  • 0 in reply to Vishesh Pithadiya
    Prodigy 240 points

    Hi Vishesh

    For EDGE/HTPLG, if now I disable I2C (ISEL = low), and pull high for this pin (select rising edge)

    My question is that this pin also connects to HDMI connector pin 19 (Hot plot detect). Base on the function of hot plug pin of HDMI, it would be high or low, so perhaps it would impact the level of this pin?

    If yes, how to prevent this? Do not connect HDMI pin 19 to EDGE/HTPLG? But in this case, once I want to enable I2C (ISEL = high), I will lose the function of hot plug detect. 

    Thank you

  • 0 in reply to louis.chang
    TI__Mastermind 37840 points

    Hey Louis,

    Yes this is correct. The device is designed to operate in either I2C mode or pin-strap mode. When switching between the two connections mat need to be changed. I suggest that you build a network like this the layout so can easily swap between PUP, PDOWN, and Hot Plug

  • 0 in reply to Vishesh Pithadiya
    TI__Mastermind 37840 points

    R1 and R2 can be 0 ohm resistors, and you can place the 1K resistor on R3. Removing and populating the resistors will control whats going into the pin.