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TPS65987D: Audio is not received from an iOS device attached using a USB-C to Lightning cable

Chamira Perera
Prodigy 195 points
Part Number: TPS65987D

Hello,

With my design that uses the TPS65987D (device) I am using it to source power to a host using a USB-C cable. In addition the design sinks audio from an attached host device. 

So far the design is able to provide power as well as receive audio from hosts that have a USB-C port, e.g. an Android phone that has a USB-C port. It is also able to only receive audio from a laptop which has a USB-C port. The design only sources 5V up to 2A so it is not able to charge the laptop. 

Part of the requirements of the design is to provide power to an iOS device (e.g. iPhone) using a USB-C to Lightning cable. Additionally the design needs to receive audio from the attached iOS device. So far the design is able to source power to the iOS device via the USB-C to Lightning cable but not receive audio. 

To summarise, from a power point of view our design is DRP and prefers power source. For data we want to be a device (UFP). Also we're not using the SSRX, SSTX pins but just the DP, DN pins. 

The design has the following configuration. 

  • Using an external SPI flash to store the patch bundle config
  • SPI_MISO is 1, and ADCIN1 is 0.24

Following is the relevant portion of the schematic from our design:

I've also attached the project file exported from the Application Customization Tool. 

So my question is, is there anything that we may be doing wrong? Are there any errors in the configuration for the TPS65987D? Any tips, suggestions on how to proceed would be greatly appreciated. 

Kind regards,

Chamira Perera. 

  • 0
    Prodigy 195 points

    I forgot to attach the project file. Its attached in this post. 

    Thanks,

    Chamira Perera. tps65987ddh_advanced_avio.pjt

  • 0 in reply to Chamira Perera
    TI__Mastermind 29995 points

    Hello,

    I've assigned this issue to the relevant expert who will respond to you early next week

  • 0 in reply to Adam Mc Gaffin
    Prodigy 195 points

    Hi Adam,

    Thank you for letting me know. Looking forward to hearing back an answer.

    Kind regards,

    Chamira.

  • 0 in reply to Chamira Perera
    TI__Expert 8120 points

    Hello,

    "It is also able to only receive audio from a laptop which has a USB-C port. The design only sources 5V up to 2A so it is not able to charge the laptop." 

    >>> Please share PD trace for further debug. 

    "Part of the requirements of the design is to provide power to an iOS device (e.g. iPhone) using a USB-C to Lightning cable. Additionally the design needs to receive audio from the attached iOS device. So far the design is able to source power to the iOS device via the USB-C to Lightning cable but not receive audio."

    >>> I'm not sure whether iPhone can act as USB host while its getting charged. Does Audio work if you configure TPS65987D as Sink only device? 

    Please note that TPS65987D  do not control DP/DM. 

    Thanks
    Prajith. 

  • 0 in reply to Prajith Cheerakkoda
    Prodigy 195 points

    Hi Prajith,

    Thank you for your response. 

    Unfortunately I do not have a device that can capture a PD trace so I am unable to provide one. 

    I tried configuring the TPS65987D as a UFP only device but unfortunately the iOS device is not sending audio over the lightning port. 

    I did a bit more digging and it seems like the iOS device is not enumerating with our device. When I tried a laptop with a USBC port our device (with the TPS65987D and same UFP only config) enumerates  with the laptop. So it seems something is not quite correct with either the iOS device or the USBC to Lightning cable. 

    Kind regards,

    Chamira. 

  • 0 in reply to Chamira Perera
    TI__Expert 8120 points

    Hello Chamira,

    "Unfortunately I do not have a device that can capture a PD trace so I am unable to provide one."

    >> PDOs higher than 5V are failing? Did you look at scope trace of Vbus and CC lines? 

    "I did a bit more digging and it seems like the iOS device is not enumerating with our device. When I tried a laptop with a USBC port our device (with the TPS65987D and same UFP only config) enumerates  with the laptop. So it seems something is not quite correct with either the iOS device or the USBC to Lightning cable. "

    >> Got it. 

    Thanks

    Prajith

  • 0 in reply to Prajith Cheerakkoda
    Prodigy 195 points

    Hi Prajith,

    PDOs higher than 5V are failing? Did you look at scope trace of Vbus and CC lines? 

    >> The PDOs setup in my config are only 5V and they are working as expected. i.e. the TPS65987D is sourcing power to the iOS device via the USB-C to Lightning cable. 

    Thanks,

    Chamira. 

  • 0 in reply to Chamira Perera
    Prodigy 195 points

    Hi Prajith,

    We were able to get some information from Apple and they mentioned that when the USBC to Lightning cable is plugged in, the cable turns the iOS device into a UFP. So this finding is consistent with what you said before that the iOS device cannot charge and provide audio at the same time with the USBC to Lightning cable. 

    Thank you so much for your support. With these issues resolved our design is complete and working well. 

    Kind regards,

    Chamira. 

  • 0 in reply to Chamira Perera
    TI__Expert 8120 points

    Hello Chamira, 

    Glad to know that all issues are resolved and your design is working well..!

    Thank You,

    Prajith