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Original question:

TLV320DAC3100EVM-U: Observing harmonics in audio played at 16KHz sampling rate.

TLV320DAC3100EVM-U: How to Implement Audio Switching Between Speaker and Headphones with TLV320DAC3100?

Rahul Patil
Prodigy 20 points
Part Number: TLV320DAC3100EVM-U
Other Parts Discussed in Thread: TLV320DAC3100

Tool/software:

I am using the TLV320DAC3100 codec in my application, and I need to implement the following functionality:

  • When audio is playing through the speakers and headphones are plugged in, the audio should automatically switch to the headphones, and the speakers should be muted.
  • When the headphones are unplugged, the audio should switch back to the speakers, and the headphones should be muted.

I know the codec supports headphone jack detection and has programmable audio routing, as mentioned in the datasheet. However, I am a bit unclear about how to configure the codec registers and handle the headphone detection signal to achieve this functionality.

Can you please provide:

  1. A step-by-step guide for configuring the TLV320DAC3100 to enable this feature?
  2. A code snippet (I2C commands or pseudocode) for:
    • Detecting headphone insertion/removal.
    • Switching the audio path dynamically between speakers and headphones.

Additionally, if there are any specific register settings or application notes/documents you recommend referring to, please let me know.

Thank you for your support!

  • +1
    TI__Genius 12695 points

    Hi,

    To set this, you would need some processor to detect an interrupt and run the audio path switching code. First, you would enable headset detection with page 0 register 67. Then, set the headset detection as an interrupt with page 0 register 48, and then set one of the GPIO pins to output the interrupt output (say for example, register 51 would set GPIO1 output, select the INT1 output so GPIO1 will go high when the jack is inserted). Then, when the interrupt goes high, you can run a snippet of I2C to mute the class D and unmute the headphone driver:

    page 1 register 42 -> mute class-d output
    page 1 register 40 -> unmute HPL
    page 1 register 41 -> unmute HPR output
    page 1 register 31 -> make sure headphone drivers are powered up

    There is an example script in section 6.3.10.15 of the datasheet to play audio through both headphone and the speaker outputs, so I would recommend using that as a starting point, muting the headphone outs until the interrupt goes high when the headset is plugged in.

    Let me know if you have more details of your system or need more help here.

    Best,
    Mir