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TLV320AIC3100 jack detect schematic

Miro Virta
Prodigy 20 points
Part Number: TLV320AIC3100


Tool/software:

Hi!

Based on the datasheet of TLV320AIC3100 I am not quite sure if my schematic is correct for the headphone jack detection circuit. I would like to double check this with TI experts before ordering my boards. Attached is my schematic at the moment. The intended functionality is detecting when headphones are attached so that I can mute the speaker amp. I do not have a need for the mic input in my application,

Do you have any feedback?

Best regards,

Miro

  • 0
    TI__Genius 13995 points

    Hi Miro,

    About your headphone connections, you may want to use ac-coupling capacitors on your HPL and HPR lines, and do your headphones need a ground? Typically the sleeve connection on your jack should be to ground. 

    Also, you should use some decoupling capacitors around the power supplies, please refer to figure 8-1 on the datasheet for an example circuit configuration. I also notice your reset pin is always high, you may want to tie that to your MCU so you can pull it down when a hardware reset is needed. We also recommend that you separate analog and digital grounds, they can come together at a common point (typically underneath the chip).

    Best,
    Mir

  • 0 in reply to Mir Jeffres
    Prodigy 20 points

    Hi Mir,

    Thanks for the comments! Indeed I had missed such a simple thing as connecting the sleeve to ground. Lesson learnt, I should always wait overnight before asking for help after staring at a schematic for too long.

    I have now added the missing ground connection and the ac-coupling/decoupling capacitors and done the splitting of the ground planes.

    Coming back to my question about the jack detection, is the wiring now correct for the jack? Am I correct in assuming that the sleeve pin should be connected to analog ground?

    Best,

    Miro

    ...

  • 0 in reply to Miro Virta
    TI__Genius 13995 points

    Hi Miro,

    I verified with coworkers and realized that since you do not have a microphone connected, you should ground the ring 2 pin on your jack as well, something like this attached picture. Then your jack will be as expected for the headset with no microphone detection scheme. And yes, it is analog ground for the headphones!

    Let me know if you have more questions here.

    Best,
    Mir