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DS90UB953-Q1: Does 953 support PoC with STP cable

Huang David
Intellectual 320 points

Part Number: DS90UB953-Q1

Hi Expert,

Looks like 953 can support the POC with coax, want to check with you does 953 support POC with STP cable?

If so, please recommend a application circuit for the STP POC circuit?

Thanks

Best regards,

David

  • 0
    TI__Mastermind 28071 points

    Hi David,

    Thanks for your inquiry. The DS90UB953 does support PoSTP as well as PoC configurations. We have completed some limited testing on PoSTP, and would recommend that the typical PoC network which is connected to Dout+ in figure 8-2 of the DS90UB953 datasheet is duplicated to also be present on Dout-. 

    One quick additional note, when using PoC or PoSTP it's important to verify that the board meets channel specification requirements and applicable noise specifications for the ser/des pair to function properly.

    Best,

    Thomas

  • 0 in reply to Thomas Bejin
    Intellectual 320 points

    Hi Thomas,

    Thanks for your quick reply. which device of FPD can support PoSTP?

    Best regards,

    David

  • 0 in reply to Huang David
    TI__Mastermind 28071 points

    Hi David,

    PoSTP is supported by the serializers within our ADAS family such as the 913A, 933, and 953. The important consideration here is to ensure that the applicable channel and noise specifications are being followed. 

    Best,

    Thomas

  • 0 in reply to Thomas Bejin
    Intellectual 320 points

    Hi Thomas ，

    Thanks for your feedback. Could you help provide a PoSTP application circuit schematic for reference with 913A, 933 or 953?

    BTW, does the IVI products 94x support PoSTP or not?

    Best reards,

    David

  • 0 in reply to Huang David
    TI__Mastermind 28071 points

    Hi David,

    The devices in our IVI product family are not typically configured using PoC or PoSTP. Regarding the reference schematic for the ADAS devices, we would recommend using the configuration shown in the product datasheet, with the typical PoC network which is connected to Dout+ being duplicated to also be present on Dout-. 

    An example of the circuit schematic recommended can be seen below in figure 8-2 of the DS90UB953 datasheet. Please note that this circuitry is for PoC, and the circuitry on Dout+ would need to be replicated on Dout- for PoSTP setup.

    Best,

    Thomas

  • 0 in reply to Thomas Bejin
    Intellectual 320 points

    Hi Thomas,

    Thanks for your feedback. What I care about is that how to secure the POC impact on the back channel. As you know, the the back
    channel is 50-Mbps in synchronous mode and 10-Mbps in non-synchronous modes.  And the power frequency is also low freqency.

    Could you help share how to secure the back channel communication with POC of different current loading?

    Thanks

    Best regards,

    David

  • 0 in reply to Huang David
    TI__Mastermind 28071 points

    Hi David,

    Thanks for your follow up. Do you know what POC current load is desired for this application? For the example circuit in the datasheet it is recommended to stay below 150mA.

    Best,

    Thomas

  • 0 in reply to Thomas Bejin
    Intellectual 320 points

    Hi Thomas,

    The expected current is 500mA, just want to know why the max current is 150mA, what factors limit the current?

    Could you describe more detail about this?

    Thanks

    Best regards,

    David

  • 0 in reply to Huang David
    TI__Mastermind 28071 points

    Hi David,

    Thanks for your follow up. We do have other POC networks which we recommend for handling of higher current loads. Generally PoC networks with higher current ratings use inductors rather than ferrite beads as the performance of ferrite beads changes under higher current loads. Below is a PoC network which uses components from Murata and is rated for up to 800mA. 

    Best,

    Thomas