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TUSB1046EVM: Using back-to-back evaluation boards, DFP <> UFP for injecting power over USB+PD connection

Oded Noam
Prodigy 10 points
Part Number: TUSB1046EVM
Other Parts Discussed in Thread: TUSB1064

I'm prototyping a USB Type-C charging hub that allows DP Alt-mode traffic to pass through. 

Although the product features lists that the EVM can be operated in DFP or UFP mode (controlled via I2C), the user guide only specifies using the type-c as UFP. Moreover, the board only has type-B and type-C receptacles, so the connectivity is unclear (or nonconformant?) if the type-C is the DFP.

My assumption was that I could use two TUSB1046EVMs, back-to-back, in the following configuration:

1. TUSB1046EVM in DFP mode, connected to host - receiving USB SS + DP (2 lanes) from host, acting as PD source towards host.

Sending USB-SS signal over the USB-B (?) receptacle, through a USB3 hub, towards the 2nd EVM.

Sending DP signal over a DisplayPort cable, towards the 2nd EVM.

2. TUSB1046EVM in UFP mode, connected to display - receiving USB SS (from type-B receptacle) and DP (from DP receptacle).

Any idea how the DFP mode operates on the TUSB1046EVM? 

Alternatively, I could use the following configuration:

1.  TIDA01243 connected to host

Sending USB-SS signal over the USB-A receptacle towards the 2nd EVM

Sending DP signal over a mini-DP<->DisplayPort cable, towards the TUSB1046EVM.

2. TUSB1046EVM in UFP mode, connected to display - receiving USB SS (from type-B receptacle) and DP (from DP receptacle).

Can you please comment on whether this setup is expected to work for high-speed (2 lane, 4K@60fps) DP traffic without additional components.

  • +1
    TI__Guru 64326 points

    Hi,

    TUSB1046 is intended to operate in as a USB/DP Source (or DFP) only. I believe the confusion on the product page is that technically the on board PD controller can be configured for each of these modes (DFP, UFP and DRP). TUSB1046EVM should be used when connecting a DP video source and USB host to the DP and USB Micro-B receptacle, respectively.

    A connected UFP (USB device /DP video sink) uses the USB-C receptacle to have sink side application you will want to use TUSB1064EVM (acts as a UFP). If you are creating a USB-C Hub with DP capability you will want to use the TUSB1064 EVM as the upstream port of the hub (side connecting to a PC or laptop) would use TUSB1064. PD controller configuration would have to be change to do a power role swap to charge the connected DFP (laptop or phone).