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TUSB2E221: eUSB repeater power consumption in active and idle modes

Jack Ni
Prodigy 80 points
Part Number: TUSB2E221

Tool/software:

Hi TI experts,

I'd like to consult eUSB2 repeater power consumption.

If SoC supports eUSB2 interface to replace USB2 in the future, we must use eUSB2 repeater IC for inter-devices and the out of the box (USB2 interface.)

The power consumption should be big challenge.

For example, TUSB2E221 ICs are used in design application - "3 USB ports + camera + fingerprint + card reader”, will the maximum power consumption in active and idle modes be?

Thanks.

Jack

  • 0
    TI__Mastermind 27925 points

    Hi Jack,

    The maximum power consumption in idle, LS/FS, and worst-case is listed in the datasheet.  

    The power consumption will vary based on USB bus activity.  The best way to get an estimate on the power is by using an EVM. ~26mW during HS idle as shown in the datasheet, and I have measured 144mW in the lab while actively transferring data to a USB stick.

    Regards,

    Nicholaus

  • 0 in reply to Nicholaus_Malone
    Prodigy 80 points

    Hi Nicholaus,

    Yes, I checked the datasheet and saw these data.

    I am concerned that implementing more eUSB2 repeater ICs in personal systems in the future will cause extra power consumption in both active and idle modes.

    For example, if a personal system is designed with 3 USB ports, a camera, a fingerprint scanner, and a card reader, we will need at least 3 dual-port eUSB2 repeater ICs. The idle power consumption will be 78mW (26mW x 3), and the active power consumption will be 432mW (144mW x 3).

    If there is anything I misunderstand, please advise or provide your estimation for the above design case.

    Thanks.

    Jack

  • 0 in reply to Jack Ni
    TI__Mastermind 27925 points

    Hi Jack,

    Yes, you understand correctly.  If you use 3x the devices it will consume 3x the power.

    However, if all of those devices you mentioned are USB devices.  Then I would expect you to only use 1 eUSB repeater between the SoC and a USB hub.  The USB hub would create the additional USB ports.  

    SoC->eUSB repeater->USB HUB

    Regards,

    Nicholaus

  • 0 in reply to Nicholaus_Malone
    Prodigy 80 points

    Hi Nicholaus,

    Thank you for the information.

    I'd like to confirm with you where the 144mW you mentioned is defined in the datasheet.

    26mW is "PHS_IDLE_LP_1", correct?

    Jack

  • 0 in reply to Jack Ni
    TI__Mastermind 27925 points

    Hi Jack,

    The 144mW is not in the datasheet.  The power consumption will change based on the USB bus activity, so it is difficult to provide a typical value for TUSB2E221 power consumption.   I measured 144mW in my test setup in the lab with 1 EVM during data transfer, but that value is not representative of all devices across voltage, temperature, and system.  It is meant to be a rough estimate.

    Regards,

    Nicholaus

  • 0 in reply to Nicholaus_Malone
    Prodigy 80 points

    Hi Nicholaus,

    Thanks for your feedback.

    I understand that this is a rough estimation based on EVM measurements.

    Is "during data transfer" similar to the condition described below?

    Jack

  • +1 in reply to Jack Ni
    TI__Mastermind 27925 points

    Hi Jack,

    The worst-case power consumption is measured over voltage and temperature with a configuration and signal pattern that maximizes power consumption. Power consumed during normal operation is less than this.

    Regards,

    Nicholaus 

  • 0 in reply to Nicholaus_Malone
    TI__Mastermind 27925 points

    Hi Jack,

    Can you tell me the customer and project name?

    Thanks,

    Nicholaus

  • 0 in reply to Nicholaus_Malone
    Prodigy 80 points

    Hi Nicholaus,

    There is no project name now.

    The investigation is for HP products with Intel next generation platforms that supports eUSB2.

    Thanks.

    Jack

  • 0 in reply to Jack Ni
    TI__Mastermind 27925 points

    Hi Jack,

    That's right, I remember supporting you, sorry for the confusion.  Let me know if you have any other questions.

    Thanks,

    Nicholaus