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Original question:

TPS65987D: Switching between PP_HV1 and PP-HV2

TPS65987D: PD Power Negotiations

Hiroki Akiyama
Prodigy 10 points
Part Number: TPS65987D
Other Parts Discussed in Thread: TPS65987

Hi Team,

I have some questions about  TPS65987D.

1) I only want to input 15V voltage to the device, but is it possible to set it to exclude other voltages?
For example, if a power supply that only supports up to 9V is input, such as a 25W adapter, is it possible to not input power to the device?

2) Is external Flash memory required in the circuit to set the PD required voltage to TPS65987?

Thanks,

Hiroki

  • 0
    TI__Mastermind 32791 points

    Hiroki,

    1.  All type C devices need to support a 5V contract, so it is not possible to exclude this voltage, but with the TPS65987, you can limit it to only 5V and 15V by only creating 2 PDOs, one for 5V and one for 15V.  This will prevent any other voltage from being present.

    2.  The Flash memory stores that configuration as well as firmware patch information, so it is required unless you have a MCU in your system that has 16kBytes of storage that you can dedicate to storing the patch.  If you have a MCU and this memory, then you can use our patch bundle flow to power up your system at 5V, and then load the patch over I2C. 

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Prodigy 10 points

    Hi, Chuck,

    Regarding the Answer 2, after starting up the device, what is its state before configuring it using I2C? Is it in a state where it only accepts 5V?

    Thanks,

    Hiroki

  • 0 in reply to Hiroki Akiyama
    TI__Genius 10772 points

    Hi Hiroki,

    With the holidays this week, many device experts are currently out of the office. They will look into this and provide you a response when they return. Please expect some delay accordingly.

    Thanks,
    Field

  • +1 in reply to Field Tolson
    TI__Mastermind 32791 points

    Hiroki,

    The Device will enter into a 5V implicit type C connection and close the power switch to provide up to 15W to the system for booting.  It will enter into what we call waiting for patch mode.  This will allow you to load the configuration and patch into the device and then it will negotiate whatever contract you specify in your configuration after you load the patch.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Prodigy 10 points

    Thank you so much.