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TAS6754Q1EVM: The sampling frequency is not being set to 48kHz as intended.

?? ??
Prodigy 40 points
Part Number: TAS6754Q1EVM

Tool/software:

We are currently in the process of setting up an audio playback environment using the TAS6754Q1EVM.
The evaluation board is connected to a PC via USB, and we are attempting to send audio data via I2S.

[Question]
On the PPC3 interface, the sampling frequency is displayed as “FS Error.”
According to measurements taken with an oscilloscope, the LRCLK is operating at 48kHz.
Although no sound is currently being output, it appears that the audio data is reaching the amplifier.

Would you be able to advise on any possible causes of this issue, as well as any recommended countermeasures?


[My test environment]

USB connection between TAS6754Q1EVM and PC (PPC3).
Connect TAS6754Q1EVM and 4ohm Resistor(simulated speaker).
J13: D
J21: USB
J19: OPEN
J22:SCL
J23:SDA
Audio data output from PC(foobar2000) via USB

  • 0
    Prodigy 40 points

    I have an additional question regarding the PPC3 of TAS6754.

    Could you please inform me of the conditions under which the "FS Error" is displayed on PPC3?

    Thank you in advance for your assistance.

    Best regards,

  • 0 in reply to ?? ??
    TI__Mastermind 49430 points

    Hi 

    Device only able to detect external clock under Hi-Z or Play mode.

    To reach this state, firstly you need to check if connected load at the output side, like 4ohm resistor would be fine. If not connect load, device will stuck at Load Diag state, can't detect the clock. And if you are using speaker load, take care that some speaker type have extremely large resistance under DC, will make device think it is open load condition.

  • 0 in reply to Shadow He
    Prodigy 40 points

    Hi

    I have reviewed everything you provided, but unfortunately, I am still encountering the same issue as in my initial inquiry.

    Are there any other possible causes or countermeasures we should consider?

  • 0 in reply to ?? ??
    TI__Mastermind 49430 points

    Hi 

    Clock and audio, is provide through jumper to TAS6754 IC. Please check if the jumper correctly mounted on your board, and use oscilloscope to check SCLK and LRCLK frequency on the test point.

    Also, please check the I2C jumper on your board. Maybe the I2C is not really working, and PPC3 shows incorrect information.

  • 0 in reply to Shadow He
    Prodigy 40 points

    Hi,

    I have verified the frequencies:

    • SCLK: 3.072 MHz

    • LRCLK: 48 kHz

    These values are within acceptable limits based on our calculations.

    Additionally, I have reviewed the I2C configuration. A jumper has been installed to short the SDA/SCL to the center pin.

    According to the logic analyzer, the system is repeatedly attempting to write data to addresses 0x65 and 0x70.

  • +1 in reply to ?? ??
    TI__Mastermind 49430 points

    Hi 

    Sounds everything is normal.

    Let's use PPC3 set device into PLAY, and please check at the OUT pins, if there's PWM generated.

    And let's also look at the registerts.

    Register 0x72 and 0x73 should be value 0x44 if all CH successfully into PLAY.

    The Fs error you met, is just the register 0x76, check what is the value.

    Finally is the Fault register, from 0x7D to 0x8F. Will tell you any fault the device running into.

  • 0 in reply to Shadow He
    Prodigy 40 points

    Hello,

    I have reviewed the response. It seems that the IC was shorted, likely due to a soldering mistake when it was replaced. I apologize for any inconvenience caused.