• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 33 subscribers
  • Views 770 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TUSB4041I: How to configure the part through pin strap to support battery charging either with or without host connection?

John11513
Expert 5720 points
Part Number: TUSB4041I

Hi,

My customer want to configure the part to support battery charge on down stream port 1~4 either with or without host connection. They have tried below configuration: (they prefer pin strap configuration)

PWRCTL[1:4]=1;

PWRCTL_POL=0; 

AUTOENz=0;

While the hub can only charge the down stream battery without connection of host. With host connected, the hub neither charges the battery nor communication with down stream equipment. What is wrong with this configuration? Could you please give me a correct pin configuration to support this functionality?

Thank you,

John

  • 0
    TI__Guru 60870 points
    Hi John,

    Can you share the schematic? Can they confirm that downstream VBUS goes from high to low to high again when the host is connected? This forces the downstream device out of DCP/ACP mode and allows it to reconnect at CDP mode. Is the PWRONx_BATENx pin being used to control the downstream port power switch? This is a requirement for charging mode support.

    Regards,
    JMMN
  • 0 in reply to JMMN
    TI__Expert 5720 points
    hI Jmmn,

    Thank you for reply. Yes there are two VBUS switches which are controled by PWRONx_BATENx pin of HUB. This is a seperate Hub board, no MCU on it. How can they implement VBUS control?

    Regards,
    John
  • 0 in reply to John11513
    TI__Guru 60870 points

    The VBUS toggling when entering / exiting charging mode will happen automatically through TUSB4041 control.  Does the host see the hub, but not the downstream devices?  Or does the host not see either?

    Regards,

    JMMN