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Original question:

TUSB4041I: Basic implementation of the HUB

TUSB4041I: Questions about the configuration

Jack Shen2
Expert 4475 points
Part Number: TUSB4041I

Hi, 

I have few questions about TUSB4041I this part: 

1. What does personal power control mean? What is the difference between the two?

           0 = Individual power control supported when power switching is enabled

           1 = Power control gangs supported when power switching is enabled

 2. Port 1 and port 4 add USB current limit, Port 2 and Port 3 have no USB current limit, then should I set FUllPWRMGMTz this pin to be high or low? 

 3. If  there is no need to have USB battery charging, then PWRON1_BATEN1/ PWRON2_BATEN2/ PWRON3_BATEN3/ PWRON4_BATEN4 should set to low. Is that correct? 

Thanks. 

  • 0
    TI__Guru 60870 points

    Hi Jack,

    1.  Individual port power control means that each ports power is controlled individually.  Ganged port power control means that 2 or more ports are controlled by a single power switch.

    2. If any of the ports do not have port power control ( port power always on), FULLPWRMGMTs should be high.

    3.  If battery charging is not needed, the internal pulldowns on the PWRONx pins will disable battery charging.

    Regards,

    JMMN

  • 0 in reply to JMMN
    TI__Expert 4475 points

    HI JMMN, 

    Thanks for the reply. 

    I have a follow up question for question#3. If battery charging is not need, which will leave the PWRONX_BATENX pin floating (internal pull down), then when we are selecting current-limiting power switch devices, the EN pin should be high enable or low enable in order to have the output from the current-limiting power switch?  

  • +1 in reply to Jack Shen2
    TI__Guru 60870 points

    Hi Jack,

    The polarity of the PWRONx_BATENx pins can be adjusted using the PWRCTL_POL pin.  It can be set to either either active high or active low.

    Regards,

    JMMN