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TPS65987D: questions for the boot mode setting

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Replies: 4

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Part Number: TPS65987D

Customer is going to use TPS65987D in their notebook. They are asking for the boot mode pin setting. There are below 2 application cases they are considering:

1) TPS65987D port is configured as a DFP by default, with 5~20V, 0.9~3A sourcing capability; when the adapter is plugged, TPS65987D port switches to UFP, with 5~20V, 0.9~3A  sinking capability.

2) TPS65987D port is configured as a DFP by default, with 5V, 3A sourcing capability; when the adapter is plugged, TPS65987D port switches to UFP, with 5~20V, 0.9~3A  sinking capability.

As for Case 2, is it possible to achieve without EC controller?

For the above 2 cases, how to configure the ADCIN1 and ADCIN2 (need to support dead battery mode), respectively?  

Thank you.

  • Hi Aki,

    It is possible to achieve both cases without an EC. You can use an SPI Flash on the system instead and upload the exact configuration that you need for your application.

    Thank you,
    Eric

  • In reply to Eric Beljaars:

    Eric,

    Could you please help further explain how to achieve this? What about ADCIN1 and ADCIN2? Could you please help suggest any reference materials ? Thank you!

  • In reply to Eric Beljaars:

    Hi Eric,

    for case 1, it is a DRP application without  an EC. But  can't find  BUSPOWERZ Configurations  table with  5~20V, 0.9~3A sourcing capability in TPS65987 and TPS65988 SPI Less Host Programming Over I2C. Is it missing?

    for case 1, if DRP application with an EC for  5~20V, 0.9~3A sourcing capability. Is it possible to change the power level 5V/9V/12V/20V  by I2C(65987D informs EC and EC informs BQ25710 to change the power level)?

    Thanks.

  • In reply to user6052098:

    Hello,

    There is no Pin strapping configuration to do 5V-20V sourcing. Either an SPI Flash or I2C host to load the configuration/patch would be required for that use case. 

    If there is an EC available and the power contract changes, the TPS65987D can send an I2C interrupt to the EC and the EC can read back the new power contract.

    Thank you,
    Eric