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TAS5782MEVM: TAS5782 unable to output audio to speakers

Part Number: TAS5782MEVM
Other Parts Discussed in Thread: TAS5782M

Hello,

I am currently trying to output audio by connecting i2s to an amplifier (TAS5782MEVM). I am having problems with activating/enabling the device with i2c on the amplfier. I have connected i2s to the amplifier and output sound through i2s to the amplfiier and I am able to observe the signals on the i2s. However, there is no sound coming out from the speakers that I have connected to the amplifiers. I later found out that I need to communicate with the amplifier also through i2c to configure and active the different settings which I also did but still no audio coming out from the speaker. 

I am outputting a signal of 44.1khz 16bit through i2s and have 3 pins; BCLK, SDOUT, and LRCLK. The datasheet for the TAS5782 mentions that to enable audio simply send to the address 0x90(slave addr+write bit): 0x00, 0x00 and then 0x7f, 0x00 and lastly 0x02, 0x00. However still I can't get any sound. Also tried a lot of different configurations without any success. I suspect that the page and book is somehow wrong therefore not writing to the device correctly. 

This is the following configurations I've tried:

 uint8_t configs[][2] = {

{0x00, 0x00}, // Go to page 0.
{0x7f, 0x00}, // Go to book 0.
{0x02, 0x10}, // Enter standby.
{0x03, 0x00}, // Unmute (Normal)
{0x01, 0x11}, // Reset modules and registers.
{0x0d, 0x14}, // The PLL reference clock is SCLK.
{0x22, 0x03}, // 8x interpolation & 48kHz fs speed mode
{0x07, 0x10}, // SDOUT DSP input & De-Emphasis enable
{0x09, 0x00}, // SCLK normal, input i2s slave
{0x28, 0x00}, // I2S, 16 bits.
{0x2a, 0x22}, // Left DAC to Left ch, Right DAC to right channel.
{0x02, 0x00}, // Exit standby.

 };

/HDx

  • Hello Hadi, 

    Are you using the PPCMB? and the PPC3 app?

    All the best, 

    Carolina

  • Hi Carolina,

    No, I am using only the tas5782mevm board and configuring through I2C with Mcu board and another mcu that sendrag i2s audio data to the tas5782mevm board. Have been looking in the datasheet and tried to configure the tas5782mevm board by sending the I2C register commands but dont understand if I am sending them correctly and Also Don’t understand the page and bok commands also

    /Hadi

  • Hi again,

    I have been further checking why the audio is not working and if i2c communication is successfully, however, can't really tell. I am sending the commands above to the address 0x48 (0b1001000)+r/w  bit so that will be 0x90 I assume, I am using arduino to send these commands and start with sending the slave address and then the two commands (register then cmd) and afterwards send stopbit.

    I repeated this with all the commands above so 12 sendings total. I am able to read data back after sending one after another and get following response back. Most of the response back is the cmd that I've sent but some of the cmds response are something else:

    Start sending!
    0: 0 (sent {0x00, 0x00})
    1: 0 (sent {0x7f, 0x00})
    2: 10 (sent {0x02, 0x10})
    3: 40 (sent {0x03, 0x00}) <-- Not same as sent ?
    4: 0 (sent {0x01, 0x11}) <-- Not same as sent ?
    5: 14 (sent {0x0d, 0x14})
    6: 3 (sent {0x22, 0x03})
    7: 10 (sent {0x07, 0x10})
    8: 0 (sent {0x09, 0x00})
    9: 0 (sent {0x28, 0x00})
    10: 22 (sent {0x2a, 0x22})
    11: 0 (sent {0x02, 0x00})

    Appreciate all the help I could get to get the amplifier to start outputting sound.

    /Hadi 

  • Hey Hadi, 

    You are using the correct address 0x90 to interact with our EVM.

    I have attached the initialization file I was able to see from the I2C log from the PPC3 app, I hope you find it helpful, I realize it is quite long but that is because we are interacting with other devices on our EVM, everything written to address 0x90 is what is of concern to the TAS5782M. 

    Additionally even though you are not using the PPCMB, I do suggest for you to use the PPC3 app, because it will write the code for you for whichever configuration you pick, you may see it through the I2C log at the bottom, very helpful!

    I think you are also not running into this problem because you are able to write and read but just keep in mind: "TI recommends waiting 100 ms to 240 ms for the DVDD power supplies to stabilize before starting I2C communication and providing stable I2S clock before enabling the device outputs" from page 70 of the datasheet. 

    Please let me know if you require additional help!

    All the best,

    Carolina 

  • init.txt
    w 90 00 00 
    w 90 7f 00 
    w 90 03 11 
    w 90 2a 00 
    w 30 00 00 
    w 30 7f 00 
    w 30 01 01 
    w 30 04 33 
    w 30 05 00 91 08 
    w 30 0d 00 
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    w 30 12 02 
    w 30 13 88 80 
    w 30 0b 02 
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    w 30 0c 88 
    w 30 7f 78 
    w 30 32 88 
    w 30 7f 64 
    w 30 32 a4 
    w 30 7f 00 
    w 30 3c 80 
    w 30 3d 00 
    w 30 53 00 
    w 30 54 00 
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    w 30 01 00 
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    w 30 20 00 28 33 10 
    w 30 34 40 
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    w 30 7a 01 
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    w 90 00 21
    w 90 70 00 80 00 00 
    w 90 00 00
    w 90 7f 8c
    w 90 00 21
    w 90 74 7f ff ff ff 
    w 90 00 00
    w 90 7f 8c
    w 90 00 1d
    w 90 2c 00 80 00 00 
    w 90 00 00
    w 90 7f 8c
    w 90 00 1d
    w 90 34 40 00 00 00 
    w 90 00 00
    w 90 7f 8c
    w 90 00 1d
    w 90 38 40 00 00 00 
    w 90 00 00
    w 90 7f 8c
    w 90 00 23
    w 90 14 00 00 00 01 
    w 90 00 00 
    w 90 7f 00 
    w 90 00 00 
    w 90 07 00 
    w 90 08 20 
    w 90 55 07 
    w 90 00 00 
    w 90 7f 00 
    w 90 00 00 
    w 90 03 00 
    w 90 2a 11 
    w 90 00 00 
    w 90 7f 00 
    w 90 00 00 
    w 90 02 00 
    w 90 00 00 
    w 90 7f 00 
    w 90 00 00 
    w 90 3d 30 
    w 90 3e 30 
    w 90 00 00 
    w 90 7f 00 
    w 90 00 01 
    w 90 02 00 
    w 90 00 00 
    w 90 7f 00 
    w 90 03 00 
    w 90 2a 11 
    

  • Hi Carolina,

    Thank you for the init file :)

    just a quick question, when a row is w 90 xx xx xx xx, do I send all bytes between a start bit  and stop bit or each one individually?

    Also, have requested the ppc3 application from the website since yesterday but still haven’t got it approved and still waiting. Hope to get it by tomorrow.

    Thank you once again! I’ll try the configurations and get back afterwards with the result.

    /Hadi

  • Hello Hadi, 

    I am not too familiar programming with arduino, but I believe all the bytes between a start and stop because it is the data that belongs to that given register so it would make sense to send it altogether. 

    As for the PPC3 request, let me see what I can do to expedite that on my end. 

    All the best,

    Carolina

  • Hello Carolina,

    I managed to get it to work now and can output audio through i2s without any problems. It seems like the i2c commands I was sending from before should have worked, but there was some serious weak connections problems on the tas5782mevm board on the terminals which prevented audio to properly be transmitted. I had to solder them in order to be sure that it was properly connected. I still sometimes get poor connection on the 3.3V terminal if I by mistake touch the clamped cable.

    Thank you for the help!

    /Hadi