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TUSB4020BI: FULLPWRMGMTz

Guru 29720 points
Part Number: TUSB4020BI

Hi Team,

I would like to ask about FULLPWRMGMTz pin.
The datasheet shows the following.


On the other hand, datasheet page 17 shows the following.



It seems these two red parts are inconsistent so I believe the former is incorrect and the latter is correct.
Is my understanding correct?
I would like to clarify what "Full Power Management" means.

Best Regards,
Yaita

  • Hi Yaita,

    Both are correct, full power management low means that the hub uses the PWRCTL pins to control downstream port power.  The setting of the FULLPWRMGMTz pin does not impact hub functionality on the PWRCTL pins, it impacts the descriptor that the hub reports to the USB host.

    Regards,

    JMMN

  • Hi JMMN,

    I have had a misunderstanding..
    Thank you for your clear explanation!

    Best Regards,
    Yaita