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PUREPATH-CMBEVM: I2S DOUT, LRCLK, BCLK output

Part Number: PUREPATH-CMBEVM
Other Parts Discussed in Thread: TAS5751M, TAS5760M, TAS5717

Support Path: /Tools & software/Help me with an issue/Design Kits / Evaluation Modules / Boards/Software issue/

A Purepath-CMBEVM (version G) and a TAS5751M Evaluation Module are connected.
USB and 24V are applied. Audio is playing via speakers and audio can be listened to via the headphones.

Refering to the documentation: 1.3 PurePath Console Motherboard Detailed Operations
"Upon power-on, the PPCMB uses optical SPDIF input (default).
The I2S signals can be seen with an oscilloscope probe at the pin headers LRCLK, SCLK, SDIN, and MCLK."

My experiences: Upon power on, the PPC3 software has to be started and "End system Integration" or Audio Processing" has to be started, after which software is loaded and the amplifier is able to play music.
I expect, like the documentation is suggesting, that the board can play audio at power on from optical input at once including the delivery of all I2S signals at the pin headers.

Second question:
I have tried about all possible settings with the PPC3  (PurePath Console 3) software to get via the edge connector I2S signals to an external TAS5751 amplifier board, but only on pin DOUT a digital signal can be displayed on a oscilloscope.
There is no LRCLK nor BCLK signals. MCLK is not required to have the TAS5751 play audio.
So how can the board outputs all I2S signals for external use?

  • Hi Leen,

    For Q1, your observation is expected. When you click "End system Integration" or Audio Processing, the board starts the initialization.There is no output if the board is not initialized.

    For Q2, the PPCMB is basically used for the evaluation of TAS family digital input audio amplifier, and the initialization will be completed only when there is a real TAS audio amp device on the I2C. So when there is no TAS amp device, the initialization actually is not completed and I2S output configuration is also not initialization. Please don't forget to apply 4V power supply on the PPCMB when there is no daughter board. Please try to run the attached configuration file to enable I2S otput.

    7674.test1.txt
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    w 80 6b 33 
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    w 30 36 01 
    w 30 7f 50 
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    w 30 3a 01 
    w 30 7f 50 
    w 30 00 00 
    w 30 01 07 
    w 30 7f 50 
    w 30 00 01 
    w 30 3a 01 
    

    Best regards,

    Shawn Zheng

  • Hello Shawn,

    Thank you for your information.
    When I have finished a new PCB with the TAS5751 I will follow your instructions to get I2C and I2S running.

    In the mean time I'm testing the PPCMB and the TAS5751 EVM board. Although all limiters are switched off, the amp mutes suddenly when the speaker output peaks to about 7Vpp.
    While changing bits in the registers, I have not found a setting that overcomes this issue. The power comes from a 24V, 3 Amp power supply. The speaker impedance is 8 ohm.
    When measuring the supply current its peaks to about 0,5 A and then the amp mutes shortly and starts playing.
    When playing a 440 Hz tone, it can play loud and the power supply delivers 24V at 1 Amp continiously, without muting. The board slowly gets hand warm (43 degrees Celsius).
    What could be the case here?

    And is there updated documentation available of both the Purepath software and version-G of the TAS5751M EMV board?

    Thank you and kind regards, Leen

  • Hi Leen,

    When the issue occurs, did you read the Error Status Register to see if there is any error in it? According to your description, it doesn't look like OC or OT fault. Where is the power supply from? If it's stable, it shouldn't be OV or UV fault either. It looks more like a clock error. Could you please check the I2S input? Make sure it's stable.

    When changing the output power, you only adapt the volume register or increase/decrease the input signal, right? Because the output will be MUTE if BQ taps are programmed in the GUI to avoid pop noise.

    Please find more info about PPCMB in this document:

    Best regards,

    Shawn Zheng

  • Hi Shawn,

    The audio comes from the PC via the USB. The error register shows no errors, all zero's.
    Although I have put in parallel of the power terminals of the TAS5751M EVM board, a 10.000uF capacitor, the issue remains. Should I look for spikes with a scope?

    Your link to the documentation is what I have now, but I'm looking for the version G and the latest version documentation of the TAS5751M EVM as well that is in sync with all hardware and PPC3 software.
    For example, information about the Volume Configuration Register (0x0E) can be found in the documentation of TAS5751M SLASEC1A –MARCH 2016–REVISED MARCH 2016, but the PPC3 software doesnot show this register in the Register Map.

    kind regards, Leen

  • Hi Leen,
    Sorry for the confusion. Please use the rev F SCH in the document, it also applies for your rev G board. As you mentioned, not all of the registers are shown in the 'Register Map' in PPC3 GUI. Only the system configuration registers are shown there. You can adapt volume in 'Audio processing' -> 'Volume Configuration' in the GUI very easily and read/write the volome register in 'I2C Monitor'. Please find more info about this in the TAS5751M EVM User's Guide. www.ti.com/.../slou440.pdf
    Could you please try with a power supply instrument(e.g. Keysight...)? If there isn't any FAULT/ERROR in the device when the issue occurs, I think the MUTE is probably caused by the input source. Could you please confirm that the input signal is continuous?
    Best regards,
    Shawn Zheng
  • Hi Leen,
    Could you please help to close this question if it's answered. Let us know if you have more question.
    Best regards,
    Shawn Zheng
  • Hi Shawn,

    In the mean time I have made a new pcb, so coming day's I'm going to test it with the developerkit.

    Besides, I have an question about the start up. The documentation indicate to use PON for start up. I expect that 'normal' power up of 24V (and 3.3V with that)  does start up the amplifier.
    So when I2S audio is sent the amp it is going to play audio.
    I doubt if prior to that some settings in the registers via I2C have to loaded OR that these settings remain in the memory of the register once programmed on time (i.e. during the manufacturing process.
    Otherwise the current design requires an additional circuitry that loads the settings in the register via I2C to start up the amp. The goal is to have a one chip solution, TAS5157 only.

    kind regards, Leen

  • Hi Leen,
    Thank you for the update. Unfortunately there is no nonvolatile memory inside the device. Users need to program the device(for both TAS5717 and TAS5751M) every time power-on, so a host(e.g. MCU) is necessary in the application. If you don't want to use a host in your application, please check TAS5760M which suports Hardware Control Mode(in this mode, the configuration can be done by the hardare control pins). But the hardware resource is very limited(e.g. no BQ, no DRC) in it. Please find more info in the datasheet: www.ti.com/.../tas5760m.pdf
    Best regards,
    Shawn Zheng
  • The answer to Q1 doesnot resolve my issue. It is not expected behaviour since the documentation describes: "Upon power-on, the PPCMB uses optical SPDIF input (default). The I2S signals can be seen with an oscilloscope probe at the pin headers LRCLK, SCLK, SDIN, and MCLK."
    The outcome is that there is no I2S output and the output cannot be seen with an oscilliscope therefor. I conclude that the documentation is faulty.

    I think that the anser to Q2 does not resolve my issue also: I expect, like the documentation is suggesting, that the board can play audio at power on from optical input at once including the delivery of all I2S signals at the pin headers.
    The practice is that the chip doesnot play audio at power on from the optical input. It always requires the registers to be set using an additional MCU. TI should be utmost clear about how to control their devices. In the selection guide and studing the documentation in detail it still very unclear and I strongly recommmend that it should be taken care to prevent misunderstandings, spent of engineering hours and wasted PCB designs.
  • Hi Leen,

    I appologize for your confusion. The mother board also supports PSIA input, so the i2s signal can be applied directly on the connector J4 or pin headeds for that. But some code proram is necessary. Please find more info in the twiki:

    As I asked previously, could you check your PPCMB revision please? The 'line-in' input mode works very easily with later than revision 'D' PPCMB. If you are using revision 'D' or earlier board, you need to do some rework on it:

    For the second question, the TAS5751M EVM + PPCMB can work normally without any MCU control, because the host function is already integrated in the PPCMB. User can evaluate/test the AMP device very easily. But in the real application, user need to use a host to control/program the AMP, because the PPCMB can't be used any more.

    Sorry again for the confusion, and we will consider revising the document.

    Best regards,

    Shawn Zheng