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TS3A227E: Schematic review

Part Number: TS3A227E

Dear

       Please help me review TS3A227E schematic, especially MICP and MIC_PRESENT#,

As below information for your reference, thank you.

SCHEMATIC1 _ 0x_AUDIO CODEC_20180410A.pdf

  • Sam,

    Power pins:  VDD is supplied with 3.3 V and is within the recommended operating conditions.

    GND is correctly connected to the thermal pad and the unused GND sense line may also be connected to ground.

    Control pins:

    I2C SDA/SCL open drain outputs are pulled up to 3.3 V and are within the recommended operating conditions.

    INT is an open drain interrupt and I couldn't find where it was going

    MIC Present is also and open drain interrupt and it correctly attaches to a GPIO

    DET Trigger is correctly connected to a switch in the combo audio jack that will pull the node to ground when a headset is inserted into the Jack

    Signal path:

    Tip/Ring2/Sleeve correctly connected to the audio jack

    Sleeve Sense and Ring2 sense correctly connected to audio jack

    MIP correctly connected to the codec.

    Also please be aware of this post as well for Apple headsets. 

    Thank you,

    Adam

  • In reply to Adam Torma:

    Dear Adam

    1. About INT#, I still confirm it whether connect to PCH, if not, I will connect it to ground like description of datasheet
    2. About MIC_PRESENT#, I connected to sense pin of Codec not GPIO, is it ok?
    thank you.
  • In reply to Sam Liu69:

    Sam,

    The INT/ and MIC_PRESENT/ pins are status indication pins for communication back to the system. These are to let the system know that there are changes in the TS3A227E. If your system doesn't need to know something changed with the TS3A227E (int pin) or has detected a microphone (MIC present pin) then you may ground the pins.

    I think you should consider connecting the codec ground sense line to the GND_SENSE pin of the TS3A227E.

    Thank you,
    Adam
  • In reply to Adam Torma:

    Dear Adam

           Thank you for your reply,

    about MIC_PRESENT#, I will connect to "Sense A" pin of codec,

    about INT#, I still confirm whether we need this pin,

    ALC262 don't have "ground sense pin", so I couldn't connect to "GND_SENSE" of TS3A227E,

    last, about C3(in the schematic is C111) that value can vary depending on codec needs, 

    could I change to 1K ohm?

    SCHEMATIC1 _ 0x_AUDIO CODEC_20180412A.pdf

    thank you.

  • In reply to Sam Liu69:

    Sam,

    The R6 pull up resistor value stated in the TS3A227E is critical for the accuracy of the device key press detection feature. If you are not using the key press detection feature you can design R6 based on the requirements of the codec and microphone.

    Thank you,
    Adam
  • In reply to Adam Torma:

    Dear Adam

            I only want to confirm C3 not R6, as below is request from codec vendor, 

    should I added C3(1uF) into below portion? thank you.

  • In reply to Sam Liu69:

    Sam,

    The TS3A227E does not require the C3 cap but was included in the datasheet to show in a typical application the codec will require a DC blocking cap.  Please refer to the recommendation of the codec vendor for the capacitor you will not need an additional one for the TS3A227E.

    Thank you,

    Adam

  • In reply to Adam Torma:

    Dear Adam

            As below is from recommendation of the codec vendor that don't use the capacitor(C3), 

    only added 1K, so if no C3, is it ok? thank you.

  • In reply to Sam Liu69:

    Sam,

    As stated above the TS3A227E doesn't have an issue with the presence of a cap or not on the MICP pin. If you are using keypress detection feature of the TS3A227E the R6 resistor is important.

    I don't see any issue with the TS3A227E with your schematic.

    Adam

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