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HD3SS6126: HD3SS6126 EVM DEMUX setting

Satoshi Yone
Expert 3600 points
Part Number: HD3SS6126

Hi, Team,

A customer would like to use the HD3SS6126 EVM to evaluate the DEMUX. Is there any set up to use HD3SS6126 as DEMUX?

Best Regards,

Satoshi Yone

  • 0
    TI__Mastermind 36085 points

    Hello Satoshi-san,


        Do you mean 2 Host and one device?. I am not aware of that however, the customer can use adapters or custom cables to achieve the connectivity (please use short cables, considering that both options may impact the signal integrity).

    Regards,

    Diego.

  • 0 in reply to Diego Cortes
    TI__Expert 3600 points
    Hi, Diego,

    Thank you for the reply. I have more question for VBUS. Sorry for asking strange questions....

    Does VBUS flow the below direction? (EVM)
    U20 -> U2 and U21

    Best Regards,
    Satoshi Yone
  • 0 in reply to Satoshi Yone
    TI__Mastermind 36085 points
    Hi Satoshi-san,

    Strictly Yes, but for testing purposes the customer can flip (or short) the diodes on the VBUS lines so the power can flow backwards.

    Regards,
    Diego.
  • 0 in reply to Diego Cortes
    Guru 11515 points

    Hi Diego-san,

    Sorry for interrupt you, but I would like you to confirm about your answer.

    * According to schematic of EVM, PMOS FET exist b/w U20 and U2,U21. So, following behavior will happen to realize MUX/DEMUX finction on this EVM.

     1. When USB host is Micro-B side(U2, U21), Vbus comes from U2 or U21 (Or both), and PMOS will be switched on by this voltage(Source -> Drain).

     2. Conversely, when USB host is Micro-A side(U20), Vbus comes from U20, and I guess that PMOS of Drain-Source will conduct through parasitic diode of PMOS. In this case, i think that voltage drop will happen on VBUS line (in general, Vf = 0.6 or 0.7V).

    Then, I have following question.

    * In case of above "2", If 5V(Vbus typ) is supplied to EVM, dropped Vbus voltage may drop below min voltage(4.4V).

      So, should user care this voltage drop by user itself ?

    Thanks in advance,

    Machida

     

  • 0 in reply to Ryuuichi machida
    TI__Mastermind 36085 points

    Hello Machida-san,


         For testing purposes, I think that the best option is to remove the power switches and short the VBUS path. It is not the best case for a final product, however, in a controlled environment, you can have the VBUS path clear.

    Regards,

    Diego.

  • 0 in reply to Diego Cortes
    Guru 11515 points
    Diego-san,

    Thank you for your reply.
    I understood.

    BR,
    Machida
  • 0 in reply to Diego Cortes
    Prodigy 80 points
    Hi Diego,
    I want a USB multiplexer to help me achieve the following:
    2 USB inputs to the multiplexer
    Input 1- From a regular android wall charger (will convert the C type output to the required USB-A type using a female C-type to USB-A adapter)
    Input 2 - USB output from the PC (will again use an adapter to connect to the USB input of the multiplexer)
    Output - Should be able to select between Output 1/2 and route it to the phone that will be connected to the output
    The main criteria is that when I am routing from input 1 to the phone, the multiplexer should be able to route the 3A charging current to the phone.
    Will the HD3SS6126EVM help me do that?
    Thanks
    Srinivas
  • 0 in reply to Srinivas Iyer
    TI__Mastermind 36085 points
    Hi Srinivas,

    The HD3SS6126EVM is the right option for you. Perhaps you only have to change the Fuse and diodes, this is because the board was not originally designed for 3A, also keep in mind that the board has uB ports where you want to connect the PC & wall charger.

    Regards,
    Diego.
  • 0 in reply to Diego Cortes
    Prodigy 80 points
    Hi,
    I did not understand what you meant by " the board has uB ports where you want to connect the PC and wall charger". I only found out very recently that using a converter on the C type output from a wall charger (from C type to USB-A type) will not work since the adapter itself will not support a 3A rating. How will I connect the output from the charger to this?
    Thanks
    Srinivas
  • 0 in reply to Srinivas Iyer
    Prodigy 80 points
    Realised that the module has micro-B ports as inputs. Is this module available with Type-C or Type-B inputs?
    Regards
    Srinivas
  • 0 in reply to Srinivas Iyer
    TI__Mastermind 36085 points

    Unfortunately, we only have one version of the EVM.

    Regards,

    Diego.