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TPS65981: TPS65981 5V to PP_HV and PP_5V0 both necessary?

Mario Michel95
Prodigy 160 points
Part Number: TPS65981
Other Parts Discussed in Thread: TPS65982,

Hello TI Team,

in our project we are using a variable DCDC (as used on the TPS65981EVM) for sourcing PP_HV.

Is it still necessary to provide 5V to PP_5V0? A lower power 5V supply for PP_Cable (500mA) is available on our design. In the TPS65982 manual there is a “Type-C and PD Dock or Monitor Application“ (Figure 76) which is showing a design without extra PP_5V0. In other words, is an the PP_5V0 supply necessary at all if 5V are available with PP_HV?

Anyway I couldn't find a register setting to get our system working. Without PP_5V0 our board is not sourcing to connected devices at all. Can you give me advice or do you have a demo application?

Our system will source power up to 20V/5A and works as a UFP (FullSpeed) only.

Thanks and Regards

Mario

  • 0
    TI__Genius 10370 points

    Hi Mario,

    You do not need to use PP_5V0 if you're supplying PP_Cable with a different voltage. Make sure the voltage you use on PP_Cable is within the Type-C spec (found  on usb.org ==> Developers ==> Documents ==> Click on  "Universal Serial Bus Revision 3.2 Spec). Also, make sure to GROUND PP_5V0 if this pin isn't being used in your application (page 5 of the datasheet).

    Configuring sourcing capabilities in Customization Tool GUI is fairly easy. Depending on the template you're using (you probably want either DFP or DRP. UFP is usually set for a sink only but can be changed in the GUI as well). You would need to disable the PP_5V0 Path in the "system configuration" register (look below). 

    Then, click on the "Transmit Source Capabilities"  register and set the Switch Source to the power path of you're choosing (look below). Just an FYI, only PP_EXT can be set for 5A at 20V. PP_HV can go to 3A at 20V. 

    If you don't have the Customization GUI, please download it (Config Tool) and use the FTDI board that comes with the TPS65981EVM to flash the configuration project of your choosing: http://www.ti.com/tool/tps6598x-config. 

    One last thing, setting a PDO to a 20V/5A contract won't work if the type-c cable isn't rated for 5A. Most Type-C cables are rated for 3A. Feel free to purchase an active or e-marked type-c cable that's rated for 5A. 

    I hope this helps and If this answers your question, PLEASE select  This resolved my issue 

  • 0 in reply to Aramis P. Alvarez
    Prodigy 160 points

    Hello Aramis P. Alvarez,

    thanks, it is working now as expected. I was a bit confused about the latest version of the Host Utilities GUI software. It looks like there is a bug on the TX Source Cap register page. The (PP_5V(internal setting is double available and the second one looks like being PP_HV(internal). When I set PDO1 to PP_HV(internal) within the Application Customization tool, create a new binary, program the TPS65981 and check the settings within the Host Utilities GUI I can see that:



    When I set to PP_HV(internal) here (within the Host Utilities GUI software) it doesn't work correctly, might be PP_HVE(external) now? But anyway, when using the Application Customization tool it works!

    Best Regards

    Mario