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Which of TPS65982 or HD3SS460 should we use to multiplex SBU(AUX) signals?

Masumi Saito
Intellectual 300 points
Other Parts Discussed in Thread: HD3SS460, TPS65982

Which of TPS65982 or HD3SS460 should we use to multiplex SBU(AUX) signals when my customer uses both Ics and DP alt?

TPS65982 datasheet says "Although the HD3SS460 is able to multiplex the required AUX_N/P signals to the SBU_1/2 pins, they are connected through the TPS65982 for additional support of custom alternate mode configurations.". Does this mean they should use TPS65982 to MUX SBU (AUX) signals when they only use PD + DP alt application.

  • 0
    TI__Mastermind 30310 points

    "Custom alternate modes" means the TPS65982 has the ability to support muxing of many signals onto the SBU pins.

    For most customers, it will not be desirable to develop a custom alternate mode and currently FW does not support this feature.

    Either the TPS65982 or the HD3SS460 may be used to mux the SBU signals for DisplayPort Alternate Mode.

  • 0 in reply to Brian Berner
    Intellectual 300 points

    The customer understood that they may use eithe the TPS65982 or the HD3SS460.

    However they cannot decide yet if they should use the TPS65982 or the HD3SS460.

    Are there any big differences of electrical spec between two devices

    or which device are you usually using to mux the SBU signals for DP alt mode?

    Regards

    Saito

     

  • 0 in reply to Masumi Saito
    TI__Mastermind 30310 points

    Please use the TI Dock Reference Design as a reference.

    The schematic shows both SBU connections are optional with 0-Ohm resistors.

    The connector signal is named "CSBU1/CSBU2"

    The HD3SS460 SBU path is named "CSBU1_460/CSBU1_460" and has 0-Ohm resistors listed as NC, or not installed.

    The TPS65982 SBU path is named CSBU1_65982/CSBU2_65982" and has 0-Ohm resistors installed. Therefore, the design has only been validated using the TPS65982 signal path.