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TPS65987D: questions for the boot mode setting

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Replies: 15

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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.

  • In reply to Eric Beljaars:

    Hi Eric,

    Attach the CC1/C_CC1 PIN waveform when VBUS power up, why the CC1/C_CC1 only have around 362mv? any suggestion?

    and attach the LDO3V3 , LDO_1V8 power waveform for your reference:

    also attach the EVM board C_CC1/CC1:

  • In reply to user6052098:

    Hi Eric,

    I check the voltage threshold for EVM board, it seems it indicates the ufp dtetecting a source advertising 3A source capability, seems correct. But for my pcba voltage threold 362mv (seems VH_CCA_USB or VH_CCA_1P5),  are not meet my config( BP_NO wait,UFP, configuartion 3, MISO ground, ADCIN1 1.43V). 

    Thanks.

  • In reply to Eric Beljaars:

    Hi Eric,

    Customer has solved the issue by changing the I2C address to 0x000b. Now it can support sink between 5V-20V with default configuration 3, and it could only support 5V sink before. However, they don't know why this change can help solve this issue. Could you please help explain it?  Thank you.

  • In reply to Aki Li:

    Hi Aki,

    It sounds like the customer may not be using 1% resistors or that the divider ratio is not centered in the ADCIN read range. I'm glad you were able to solve the issue.

    Thanks,
    Eric

  • In reply to Eric Beljaars:

    Hi Eric,

    Customer said they met the same issue with our EVM, and also changed the I2C address to 0x000b to make the EVM support 20V sink. Could you please help check it? Thank you.

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