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DS90UB954-Q1: Power over cable for STP.

Harry Shin1
Expert 6740 points
Part Number: DS90UB954-Q1

Hello Team,

My customer questioned how they can configure POC with STP.

I understood that below configuration is possible. 

Could you pls help comment here??

Thank you.

  • 0
    TI__Guru** 103215 points

    Hello Harry,

    This picture is not correct. For PoSTP, you will need to have one line as the VDD, and the other line as the GND connection to carry the return current. Each side must be coupled in with a passives network and the networks should match from P-N

    Best Regards,

    Casey 

  • 0 in reply to Casey McCrea
    TI__Expert 6740 points

    Hello Casey,

    Thanks for your answer. this is good tech information for me. Let me note this.

    1 quick question is there is CAP between connector GND and POC GND.

    Is this necessary?? if so, how does system designer can determine Cap value??

    Thank you.

  • +1 in reply to Harry Shin1
    TI__Guru** 103215 points

    Hello Harry,

    An AC coupling cap is not required. If a cap is implemented to provide GND isolation between camera module and the ECU, then we would recommend to also put a high valued resistor in parallel to prevent the shield from picking up significant noise. We don't have specific guidance on the cap value 

    Best Regards,

    Casey