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TUSB546A-DCI: Suitable PD controller for interfacing alternate modes

Ben Todd
Prodigy 40 points
Part Number: TUSB546A-DCI

Hi there, 

I was hoping to use this IC for outputting HDMI over Type-C. 

I've been looking into USB-C alternate modes and noticed that TI makes a nice little chip for doing muxing (TUSB546A) that can handle the HDMI 1.4b protocol. Currently, I was hoping to port over the PD IC controller (STUSB4500 from STMicroelectronics) I am using which is programmed over i2c via its NVM (which allows up to two PD profiles and on-the-fly PD capabilities if connected to an i2c master). I don't think it handles alternate modes though, and this is where I am getting lost... does this chip require a specific PD controller capable of negotiating alternate mode configurations, or will any old regular standalone PD controller work? I've read the application report below, the schematic showing a PD controller with an inbuilt SBU mux for switching the HEAC/HPD lines - was just wondering the potential options for PD controllers for use in this application. 

If my HDMI source doesn't support HEAC, could I just potentially leave these pins floating and pull the HPD high with a 1K resistor to enable HDMI? 

Kind regards,

Benjamin 

  • 0
    TI__Guru 64326 points

    Hi Benjamin,

    I think this post below will answer your main question. HPDIN can be tied high always enable the "HDMI" path but it may be best to control this over I2C if possible (please see HPDIN_OVRRIDE in datasheet). When using I2C the physical HDPIN pin should be tied low.