TLV320AIC3104: Headset Detection, Having trouble Getting it to work.

Hi,

The headset connection of Mic_+ve (Microphone), LS_+ve (Speaker Left and Right, Mono), GND (Ground) does not look like the standard headset interface of either CTIA or OMTP as defined below. Are these the actual headset plug signals position and are they matching the board jack connection? I don't see the headset connector in the schematic above.

CTIA TRRS: Left Audio, Right Audio, GND, MIC

OMTP TRRS: Left Audio, Right Audio, MIC, GND

I have attached here the headset detection mechanism for this device.

https://www.ti.com/lit/an/slaa454/slaa454.pdf?ts=1661532722097&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTLV320AIC3104

Regards.

Below is the Schematic of the Headset Jack itself. With the connection we are making being CTIA.

Hi, 

OK thanks. Just for completeness, here is how the CTIA/OMTP connection looks like and your SJ-3541AS jack.

Make sure you are using the correct plug.

Yes this is the correct pinout.

I don't think it is a pinout issue because when we hardcode the Headset to always be a "Headset with microphone" we successfully get audio in both ears and send microphone through our system correctly.

Can you please try the headset detection on the Eval Board? If successful, send configuration.

(We have also seen some issues on the Eval board when it comes to powering on the Board with a Headset connected. In this case Headset detection reads: 10: "Ignore (reserved)" and never recovers.) Could you test this as well?

Thank You.

Which EVM board are you using to test headset detect?

Unfortunately the AIC3104 EVM audio jacks does not support headset detection.

In your testing, can you check the INT Flag (Page 0 Reg. 97 D2) if that's working as expected.

This detection should be straight from the registers if levels and driver configuration are correct, section 10.3.11 of the datasheet.

Regards.

We have the AIC3104 EVM which we modified with a single Headset Jack (Pinout shown before).


The INT Flag on D2 is shown below.

Next what we did was connect Mic to Ground and One of the Speaker Lines to Ground, this is "Pinout Swap".

Note: The Microphone input does not work when we do this, but the headset detection works correctly.

I am confused why only when an incorrect connection is made that the headset is detected. 

Can you show me your connection on the AIC3104EVM? Which connector and component you modified/replaced and the signal routing?

Using the same connector used in the product (J2 shown below).
We have connected:

MIC_+ve  >>>>to>>>> J7-Pin1 and J7-Pin 2

   LS_+ve >>>>to>>>> J12-Pin1 and J13-Pin1

        GND >>>>to>>>> J12-Pin3

Is headset detection is supported on the EVM?

For the correct register 13 case (111x xxxx) you connect J2-1(MIC) to GND same as J2-4 and which pin is this Speaker Lines to Ground?

Have you tried increasing the MICBIAS? The MICDET level is too low somehow so not detecting headset with MIC configuration.

No, the EVM is not designed for headset detection.

We were able to test the MICBIAS at all voltages. We had been using 2.5V, so first we increased it to AVDD (3.3V). And saw no change with the correct pinout, but when we made the "Pinout Swap" mentioned before, there was instability, compared to the 2.5V setting. 

The 2V setting was also tested, and no change when compared to the 2.5V.

Can you monitor the MICDET level? Is it changed with MICBIAS?

Based on the headset detection scheme section 1.2 Comparator B determine the headset with/without MIC.