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TAS2563: Feature differences QFN resp. Ball grid package (focus: microphone processing)

Rob Maris
Expert 1620 points
Part Number: TAS2563

It is very hard to extract any information regarding the microphone processing of the TAS2653. I'd suggest that both microphone signals can be returned via ASI2 serial interface. That means: featured only in the Ball grid package.

But neither the register description (ASI2_CONFIG0...3) nor the device description itself clarify this.

While querying the datasheet I just read that only the QFN-package features DSP-based Smart Bass, PBE and AGC. For my customer, both feature regions are of importance: the extra DSP features as well as the capability to read the microphone signals into a host MCU (via I2S).

Please advice me.

  • +1
    TI__Guru** 109745 points

    Hi Rob,

    The PDM mic interface is also available in the QFN version. For both package variants the data from PDM mics is sent back through SDOUT (ASI1) in a selectable data slot for recording purposes. PPC3 GUI provides further detail on what is configurable for this interface.
    PDM use case is available for 48kHz and 16kHz Fs rates.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Expert 1620 points

    Because of your answer, I consulted the data sheet again. In the register map description, in the range of TDM_CFGxx registers (all of them related to ASI1), I only find registers where the transfer to host of TX voltage&current sense, Vbat, temperature, and TX limiter gain is described.

    Then - upon further looking - I see PWR_CTL, where PDM I2S mode can be enabled. But it is not specified what is meant exactly.

    But regarding PDM description at all in the data sheet: Section 8.4.1. only provides the basic interface description to the mics itself and clocking constraints. There is no information regarding processing options, while I would expect it precisely here. Is there - besides I2S-transfer - also a link with the built in DSP?

    I also tried to find something in application info (e.g. as part of eval kit docs). Nothing found.

    I'd treat it as not sufficient when one is forced to request as download permission of the PPC3 GUI (I did so now). It shouldn't be necessary to do such at all when the goal is to get a detailed view of programmable capabilities. I'd strongly suggest to initiate an update of the datasheet or to initiate a prorammer's manual in the sense of separation of data sheet & programmer's reference manual for MCU products.

  • 0 in reply to Rob Maris
    TI__Guru** 109745 points

    Hi Rob,

    Sorry for the inconvenience. I'll share some additional information regarding PDM interface and how to configure the device as soon as possible. We're actually working on some new document for the product folder in this topic.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    TI__Guru** 109745 points

    Hi Rob,

    You may check this thread for some more information about PDM interface: https://e2e.ti.com/support/audio-group/audio/f/audio-forum/1079848/faq-tas2563-pdm-interface/3996594#3996594

    Vsense and Isense data slots are replaced for PDM1 and PDM2 when the device is configured for PDM interface.

    PDM_I2S_Mode is a special mode where only recording path is enabled, while playback (speaker) is not available. For both playback and record you should use the Tuning Mode as usual. PDM interface is not available in ROM mode.

    Best regards,
    -Ivan Salazar
    Applications Engineer