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ESD questions on the TPD12S520

Epic Vancouver
Intellectual 885 points
Other Parts Discussed in Thread: TPD12S520

Why is there a pull-up on the Hot Plug Detect on the  VLV side? During boot-up if the signal is floating then HPD is pulled up indicating that the source device can now read the EDID. But if I am not booted up then I don’t want the EDID to be read. How is this handled? If this is the behaviour then I can work around this by using an external transistor to control the HPD. Is this recommended?

 

Is this part only for the receive side? I would like to use it on the transmit side too but not sure if the level shifting will work. I could use the part for ESD protection and do level shifting external to the device. What would you recommend?

  • 0
    TI__Mastermind 41665 points

    I moved your post here into the logic forum as the TPD12S520 looks to fall under the interface product category which falls under the logic forum, I am no expert on these parts but I am hoping that someone in this forum can help out.

  • 0
    TI__Genius 9085 points

    The pull up is only suggested.  You can use an external transistor and resistor to contol the HDP.

    What voltage levels are you translating on the transmit side? 

  • 0 in reply to Hattie
    Prodigy 40 points

    I was hopeful that I could use the level shifting on the part but I can bypass it if that is what is required.

    The voltage levels are 5V to 3.3V. The concern I have is that during power-up the HPD output pin to the TPD12S520 will be pulled up. This may cause a false HPD signal to the receiving device. Pulling down is not possible because it will divide the voltage which will be undetermined.