TUSB4041I-Q1: VBUS pin connect

Che Wen Yeh

Part Number: TUSB4041I-Q1
Other Parts Discussed in Thread: TUSB8041

Tool/software:

Hi Teams,

We use TUSB8041 port 4 connect to TUSB4041. What is the proper connection for the TUSB4041's VBUS pin? Is it acceptable to apply power directly to it? thanks.

6 months ago

+1 Brian Zhou 6 months ago

TI__Guru**** 154930 points

Hi:

1: for hub1, need to supply Vbus with Vbus switch for port4.

2: connect Vbus from hub1 port 4 to USB_VBUS of hub2 with voltage divider.

Best

Brian

0 Che Wen Yeh 6 months ago in reply to Brian Zhou

Expert 1160 points

HI Brian,

So, the signal path is: from TUSB8041's port 4, through the TPS254900A (handling DP, DM, and VBUS),

and then into the upstream port and VBUS of the TUSB4041. Is that correct?

Can we replace the TPS254900A with MOSFET switches. and connect the two DM/DP lines directly, thanks.

+1 Brian Zhou 6 months ago in reply to Che Wen Yeh

TI__Guru**** 154930 points

You can connect DP/DM of TUSB8041 port 4 to TUSB4041 upstream port DP/DM directly.

Che Wen Yeh said:
Can we replace the TPS254900A with MOSFET switche

it should be Vbus switch which can be controlled by PWRCTL4 of TUSB8041.

Best

Brian

0 Che Wen Yeh 6 months ago in reply to Brian Zhou

Expert 1160 points

Hi Brian,

We are confused. Why do we need an external power switch? Is there a timing sequence requirement? Thanks.

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/823025/tusb8041-q1-usb_vbus-pin-when-battery-charging-is-not-used/3045549?tisearch=e2e-sitesearch&keymatch=TUSB8041-Q1#

0 Brian Zhou 6 months ago in reply to Che Wen Yeh

TI__Guru**** 154930 points

power switch has Fault pin for over current protection, I don't think MOSFET switch can support overcurrent.

Best

brian

Interface

Interface forum

TUSB4041I-Q1: VBUS pin connect