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AM572x GP EVM Shematic Question

Alfred Lee1
Prodigy 30 points
Other Parts Discussed in Thread: TPD12S016, TPD1E05U06, AM5728

Dear All,

 

Could you guys help me get the answer for below question?

 

  • What is the reason that both TPD12S016 and TPD1E05U06 are used for ESD protection between AM5728 and HDMI port?

 cid:image013.jpg@01D1ECDA.84D014B0

 

 

Best Regards,

 

Alfred Lee (Lee Jeong-Hwan)

Field Sales Engineer, North Region Team

+82 10-7492-2234
Email: alfred.lee@ti.com

 

  • 0
    TI__Guru**** 161600 points

    Hi,

    Could you specify which schematic revision do you refer to? (I can't see the attached image).

    Also which board is this AM572x GP EVM or some other reference design? 

    On my schematic of AM572x GP EVM, doc revision A2b, only TPD1E05U06 is used:

    Best Regards, 

    Yordan

  • 0 in reply to Yordan Kovachev
    TI__Guru 63145 points
    The capacitance was too high on the TPD12S016 device and caused issues when connected to the HDMI signals.

    Regards,
    Paul
  • 0 in reply to peaves
    TI__Mastermind 26215 points
    team, adding more here, since there were some questions coming via emails...for the benefit of all, I am adding their comments here:

    Apps 1) From a little research TPD1E05U06 have been used for HDMI ESD on the AM572 GP EVM PM board revisions A1, A2, A3, and A3a. They are also used on other EVMs with HDMI as well. I can say that with a cheap HDMI cable I saw lots of HDMI noise, green pixel artifacts, etc. It was suggested to me to use the HDMI cable that ships with the Automotive EVM which is much thicker and all of the noise issues went away.

    Apps 2) The HDMI interface is very sensitive to component loading (ESD capacitance, chokes, etc.) and PCB routing (trace impedance, via, etc.). I believe the data manual provides very specific guidelines for interface implementation. Regarding the TPD1E05U06 vs the TPD12S016… I believe there are 2 reasons the TPD1E05U06 is preferred. It has lower pin capacitance. It also provides placement flexibility to avoid any via(s) or trace stub(s) on the HDMI traces.