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Original question:

TAS5754M: Alternative Chip For TAS5754M

TAS5731M: No sound, register 0x02 show errors

user4383332
Prodigy 60 points
Part Number: TAS5731M
Other Parts Discussed in Thread: PCM5102A, PCM9211, PCM2706,

I have a custom PCB with the same schematic of the EVM board.
I'm trying to initialize the chip, I have a workling i2c communication.

But I cannot get any sound from the amplifier.
On the same i2s bus I have a pcm5102a and it is playing the audio.

The source is the ADC in the a PCM9211; the same issue also
happends with a PCM2706 as a source (via the PCM9211).

Sometimes register 0x02 have a 0x80 or 0xC0.

This is my current register dump,
PCM9211 is set with main output to DAC source,
main output goes to TAS5731M:
I: Reg 0x0000: 0b1101100(0x006C)
I: Reg 0x0001: 0b0(0x0000)       
I: Reg 0x0002: 0b0(0x0000)       
I: Reg 0x0003: 0b10100000(0x00A0)
I: Reg 0x0004: 0b11(0x0003)      
I: Reg 0x0005: 0b0(0x0000)       
I: Reg 0x0006: 0b0(0x0000)       
I: Reg 0x0007: 0b1100000(0x0060)
I: Reg 0x0008: 0b110000(0x0030)  
I: Reg 0x0009: 0b110000(0x0030)  
I: Reg 0x000A: 0b110000(0x0030)  
I: Reg 0x000E: 0b10010001(0x0091)
I: Reg 0x0010: 0b10(0x0002)      
I: Reg 0x0011: 0b10101100(0x00AC)
I: Reg 0x0012: 0b1010100(0x0054)
I: Reg 0x0013: 0b10101100(0x00AC)
I: Reg 0x0014: 0b1010100(0x0054)
I: Reg 0x0019: 0b110000(0x0030)
I: Reg 0x001A: 0b1111(0x00F)
I: Reg 0x001B: 0b11000000(0x00C0)
I: Reg 0x001C: 0b10(0x0002)
I: Reg 0x0020: 0b0111101111110010(0x000017772)
I: Reg 0x0021: 0b00100001111(0x00000433)
I: Reg 0x0025: 0b110100111000101(0x000121345)

And those are the init values:
static Command TAS_INIT_TRIM = {0x1B, 0x00};
// Do this if using PCM2706 (16bit 24khz)
static Command TAS_INIT_FMT_16B = {0x04, 0x03};
static Command TAS_INIT_SVOL = {0x06, 0x00};
static Command TAS_INIT_CH3VOL = {0x0A, 0x30};
static Command TAS_INIT_CH2VOL = {0x09, 0x30};
static Command TAS_INIT_CH1VOL = {0x08, 0x30};
static Command TAS_INIT_CH2NDLY = {0x14, 0x54};
static Command TAS_INIT_CH1NDLY = {0x13, 0xAC};
static Command TAS_INIT_CH2DLY = {0x12, 0x54};
static Command TAS_INIT_CH1DLY = {0x11, 0xAC};
static Command TAS_INIT_CFGVOL = {0x0E, 0x91};
static Command TAS_INIT_CFGVOL = {0x20, 0x00, 0x01, 0x77, 0x72};
static Command TAS_INIT_MOD1 = {0x10, 0x02};
static Command TAS_INIT_RSVD1 = {0x0B, 0x00};
static Command TAS_INIT_MOD2 = {0x10, 0x02};
static Command TAS_INIT_BKND = {0x1C, 0x02};
static Command TAS_INIT_SHDWN = {0x19, 0x30};
static Command TAS_INIT_CFGVOL = {0x25, 0x01, 0x02, 0x13, 0x45};
static Command TAS_POST_MASTVOL1 = {0x07, 0xFF};
static Command TAS_POST_SYSCTG = {0x05, 0x00};
static Command TAS_POST_MASTVOL2 = {0x07, 0x60};

I have PVDD set at 12V, AVDD and DVDD are 3.3V.
On bootrap caps I have around 12V. Outputs A,B,C,D are at 6V
ON VREG: 3.1V
On VR_DIG I have: 1.8V
On GVDD_OUT: 7.0V
On SSTIMER: 3.1V

My messy schematic:



How I can throubleshoot this?

  • 0
    TI__Guru 51180 points

    HI 

        It seems you have clock errors, The MCLK, BCLK and LRCLK must have a fixed ratio according to the below descriptions, can you check all the clocks?

  • 0 in reply to Shadow He
    Prodigy 60 points

    I'll check my clocks later today. After some more tests the 0x02 register shows errors only when using the PCM2706 as input source.
    What is odd is that even when 0x02 dont have any error I still get no audio at all.

    For reference the PCM9211 have the ADC configured as slave, with 48Khz 24bit i2s format. threshold detection is off.

  • 0
    Prodigy 60 points

    This my logic analyzer capture, TAS_XXX are the inputs of the tas5731m IC (Main output of PCM9211).
    The other signals (PCM_XXXX) are the one from PCM2706.
    In this capture the PCM9211 main output is set to its internal ADC.

    As a test I've tried to connected the MCLK to BCLK, this is my register dump.
    Even in this mode I cannot get any audio out. (note that 0x00 is now set to 0x60)
    I: Reg 0x0000: 0b1100000(0x0060)
    I: Reg 0x0001: 0b0(0x0000)
    I: Reg 0x0002: 0b0(0x0000)
    I: Reg 0x0003: 0b10100000(0x00A0)
    I: Reg 0x0004: 0b101(0x0005)
    I: Reg 0x0005: 0b0(0x0000)
    I: Reg 0x0006: 0b0(0x0000)
    I: Reg 0x0007: 0b1100000(0x0060)
    I: Reg 0x0008: 0b110000(0x0030)
    I: Reg 0x0009: 0b110000(0x0030)
    I: Reg 0x000A: 0b110000(0x0030)
    I: Reg 0x000E: 0b10010001(0x0091)
    I: Reg 0x0010: 0b10(0x0002)
    I: Reg 0x0011: 0b10101100(0x00AC)
    I: Reg 0x0012: 0b1010100(0x0054)
    I: Reg 0x0013: 0b10101100(0x00AC)
    I: Reg 0x0014: 0b1010100(0x0054)
    I: Reg 0x0019: 0b110000(0x0030)
    I: Reg 0x001A: 0b1111(0x00F)
    I: Reg 0x001B: 0b11000000(0x00C0)
    I: Reg 0x001C: 0b10(0x0002)
    I: Reg 0x0020: 0b0111101111110010(0x000017772)
    I: Reg 0x0021: 0b00100001111(0x00000433)
    I: Reg 0x0025: 0b110100111000101(0x000121345)

  • 0 in reply to user4383332
    TI__Guru 51180 points

    Hi 

         In your picture, why the MCLK signal keeps break off? Also the BCLK's duty cycle also keeps changing. That's all unacceptable for our devices.

  • 0 in reply to Shadow He
    Prodigy 60 points

    That seems to be an aquisition problem with my logic analyzer.
    I'll provide a better capture in a second moment.

    As a troubleshooting test I've connected the TAS directly to another TAS input of an already working but different design.
    Also capturing this i2s bus shows the same artifacts. Using the other design as a source, register 0x02 shows 0x08.

    I'm starting to think that something is wrong with the ICs I've got or the register configuration i set.


  • 0 in reply to user4383332
    TI__Guru 51180 points

    Hi 

        Can you test all the clock frequency with oscilloscope? 

  • 0 in reply to user4383332
    TI__Guru 51180 points

    Hi 

         The test you did include too much uncertain factors. I checked the your initial setting, and think it is fine. If you want to check it, please send them into the EVM, and use the AP to generate I2S signal into EVM. Check if everything works fine.