Other Parts Discussed in Thread: TUSB422,
Hello,
We have a board containing the TUSB422 (PD Controller) and TUSB1064 (DP Alt Mode Redriver) acting as a DP sink via USB-C. The plan to use the VBUS to power our board and would like the DFP to supply 5V @3A. I have included a list of some of my questions below,
- How is the “Hot Plug Detect” event communicated upstream to the DFP? The block diagram for the TUSB1064 shows the HPD connecting to both the TUSB1064 and the PD Controller, which in this case is the TUSB422. The TUSB422 does not provide an input for this signal.
- Since the plan is to power our board off from VBUS, I am concerned about getting the initial 5V to power up the board. Only once we have that initial VBUS power can our microcontroller boot-up and work with the TUSB422 to negotiate power. Will this be an issue? Will 5V be provided by default before negotiations?
- I read that there must be a USB Billboard device when using DP Alt-Mode. What was not clear was whether this is required for a DFP, UFP or both. Can you please let me know if this is a requirement?
Thank you!
