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TAS5825M: 2.1 configuration with TAS3251

Brian Angiel
Expert 3345 points
Part Number: TAS5825M
Other Parts Discussed in Thread: TAS3251, , TAS3251EVM

I am beginning work on a system with a 2.1 configuration. I am considering the following: stereo TAS5825M (BTL) for L and R and mono TAS3251 (PBTL) for the low frequency driver. I have some questions about how to support this using the PPC3 software.

 

Here are three scenarios I can see working and questions related to each:

  1. In the TAS5825M PPC3 module, there is a 2.1 configuration that supports the TAS5825M driving two tweeters in stereo mode operation. It also provides support for I2S connections to drive a non-Smart Amp device like the TAS5720/60. The support for a mono I2S feed to the non-smart amp is what I need, but I want to use the TAS3251 in this application.

    1. Is it possible to use this TAS5825M 2.1 Configuration – and also have a separate PPC3 tuning file that I use to configure the TAS3251?
    2. Is there a configuration I can use that supports these two TI Smart Amps in PPC3 with a single tuning file? This would greatly simplify the crossover tuning

  1. The TAS3251 PPC3 module supports a Mono, PBTL I2S input configuration. It looks like this can support all the tuning and Smart Amp features I need for my application
    1. Does this configuration require the TAS3251 to be configured as an I2S Slave device?
    2. The TAS5825M does not seem to have the feature where it can configure MCLK as an output to drive the input on the TAS3251. Is this correct?
  1. Ideally, this would be supported with a single PPC3 file for both amps.
    1. If separate PPC3 Speaker Characterization and Tuning files are required, can this be supported with a single I2S stream from a Bluetooth Sink device?

 

Also, regarding TAS5825M, I am in the process of developing my own EVM of sorts. Ideally, I would like to be able to perform tuning adjustments (like EQ and DRC) in real time on either device while listening to audio tuning files. Is this possible?

  • 0
    TI__Genius 9140 points
    Brain,

    Andy will support you soon.
  • 0
    TI__Guru 52115 points

    Hi Brian,

    I am not an expert on the TAS3251 and therefore I probably will invite my colleague to answer your question on it.

    See my comments below.

    Is it possible to use this TAS5825M 2.1 Configuration – and also have a separate PPC3 tuning file that I use to configure the TAS3251?
    [Andy] TAS5825M can take care of the entire 2.1 SmartAmp processing by itself. TAS3251 doesn't need to do any more processing.

    Is there a configuration I can use that supports these two TI Smart Amps in PPC3 with a single tuning file? This would greatly simplify the crossover tuning
    [Andy] If your customer chooses the TAS5825M 2.1 SmartAmp process flow. The whole crossover tuning will be just done in the TAS5825M PPC3 GUI.

    The TAS5825M does not seem to have the feature where it can configure MCLK as an output to drive the input on the TAS3251. Is this correct?
    [Andy] TAS5825M can only be an I2S Slave device and also support 3-wire I2S only.

    Also, regarding TAS5825M, I am in the process of developing my own EVM of sorts. Ideally, I would like to be able to perform tuning adjustments (like EQ and DRC) in real time on either device while listening to audio tuning files. Is this possible?
    TAS5825M PPC3 GUI supports In-System-Tuning mode, which means PPC3 is able to communicate with TAS5825M devices in customer boards and all the tuning can be performed in real time.

  • 0 in reply to Andy Liu (BMS)
    TI__Mastermind 20830 points

    Hi Brian,

    Looks like I'm needed to answer the TAS3251!

    Does this configuration require the TAS3251 to be configured as an I2S Slave device?

    Yes, if the I2S source is providing the LRCLK and the SCLK then you will want to set the device in I2S slave. 

     

    Best Regards,

    Robert Clifton

  • 0 in reply to Robert Clifton56
    TI__Expert 3345 points

    Hi team,

    Following up with some updates.Here's what's been successful:

    • TAS5825MEVM - PPC3 2.1 mode: 2 stereo tweeters, 1 mono woofer - works great! Crossover adjustment works well; sounds good
    • TAS3251EVM - PPC3 1.0 mode: 1 mono woofer - this also works well. PBTL mono mode is what I intend to use with the woofer.

    There are still a few things I'm working toward to get my TAS3251EVM and TAS5825MEVM working together:

    • The 2 stereo tweeters will be powered by U1 on the TAS5825MEVM (U2 will not be used)
    • The 1 mono woofer will be powered by the TAS3251 on the TAS3251EVM
    • I2S and I2C signals will be connected on the TAS5825MEVM to the TAS3251EVM
    • USB audio will be input on the PPC3 Mother Board, which is connected to the TAS5825MEVM
    • I2C configuration of the TAS3251EVM and I2S audio will come from the PPC3MB

    I've been trying various ways of interconnecting these two EVMs. I believe the TAS3251EVM will need to be setup in Slave mode (J22 shunt installed to pin 1 and 2, J19 installed).

    Maybe the issue is with the I2C addresses on the two EVM boards?

    • TAS5825MEVM U1 - 0x98
    • TAS5825MEVM U2 - 0x9A
    • TAS3251EVM -  0x94

    If you could help me understand if this is a valid configuration and how to implement my design with these two EVM boards, that would be great.
    Please let me know if you have any questions.

    Thanks,

    Brian

  • 0 in reply to Brian Angiel
    TI__Mastermind 20830 points

    Hi Brian,

    Sorry for the delay.  So are you saying you are seeing issues when trying to run this setup?

    Regards,

    Robert Clifton

  • 0 in reply to Robert Clifton56
    TI__Expert 3345 points

    Hi Robert,

    Yes, I have been having trouble getting the two EVMs to work together in the manner described above. I'm trying to determine how to get them working together.

    Thanks,

    Brian Angiel

  • 0 in reply to Brian Angiel
    TI__Mastermind 20830 points
    Hi Brian,

    Can you give us more details on the issue? Is it from the I2C communication?

    Regards,
    Robert Clifton