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TPS65982 as sink for Apple Adapter

Matthew Lilley
Prodigy 10 points
Other Parts Discussed in Thread: TPS65982, TPS65982-EVM

Has anyone been able to get the Apple Macbook Air USB C charger to negotiate up to it's maximum voltage? 

It doesn't seem to negotiate above 5V in my testing.  The Google Chromebook adapter works perfectly however. 

  • 0
    TI__Expert 3625 points
    Hi Matthew,

    Can you describe your test set-up? What firmware do you have on the TPS65982?

    Regards,
    Karl
  • 0
    TI__Mastermind 30310 points
    • The Apple MacBook Air's AC Adapter will offer 14.8V@2A as PDO Object #2
    • The ChromeBook Pixel AC Adapter will offer 12V@3A as Object #2 and 20V@3A as Object #3.
    • They both offer 5V in Object #1, per the PD spec.

    These Source PDOs can easily be observed with a USB-PD Analyzer if you have one available.

    The TPS65982-EVM has many default configurations that will accept any voltage between 12-20V@3A, but they will revert back to 5V because the MacBook AC adapter only has 2A to offer.

    Feel free to Load the Default UFP-Sink Only FW in the TPS65982-CONFIG Tool and change Sink PDO2 = 14.8V@2A, load it on the EVM, and measure VBUS.

    If you need additional information on this process, the EVM and Config Tool both have User's Guides available on ti.com

    QSG_TPS65982_Back.pdf