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TS3A225E: Asking for the TS3A225 schematic and layout review

SHH
Mastermind 30301 points
Part Number: TS3A225E
Other Parts Discussed in Thread: TS3A227E

Hi Team,
Would you please help for the TS3A225 schematic and layout review?

txn.box.com/.../00md88lbzwuaf1oy3xawjhxej8wsaki0

BR,
SHH

  • 0
    TI__Mastermind 45350 points

    SHH,

    1. VDD is correctly supplied with 3.3 V which is within the recommended operating conditions bypass capacitors are recommended to be placed as close to the IC as possible.

    2. SCL and SDA are open drain outputs and are correctly pulled up to 3.3 V

    3. MIC_PRESENT is open drain output and is correctly pulled up to 3.3V 

    4. MIC_P should be connected to codec

    5. ADDR_SEL is correctly grounded

    8. GND correctly connected to ground

    9. SLEEVE and SLEEVE_SENSE correctly connected to audio jack but R517 should not be connecting SLEEVE To MICP

    10. RING2 and RING2_SENSE correctly connected to audio jack

    11. TIP_SENSE is correctly connected to the tip of the headset. 

    12. DET_TRIGGER pin to initiate the automatic detection sequence is correctly held low until headset is inserted and then will be pulled up to 3.3V through JACK500_P3V3 node.  R518 should not connect DET_TRIGGER to MIC_PRESENT.

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    TI__Mastermind 30301 points
    Hi Team,
    Cusotmer would like to un-install R533 and R510 and install R516.
    The detection need to support CTIA apple type mic.
    Do you have any concern for the resistor change ?

    schematic link
    txn.box.com/.../l87vmqz2rn5kp3u42i2jdhzkzy02r75l

    BR,
    SHH
  • 0 in reply to SHH
    TI__Mastermind 45350 points

    SHH,

    Are you trying to permanently  ground ring2 to support only CTIA headsets?  If you are permanently configuring the audio jack for a specific headset you will not need the TS3A225E audio jack switch.  The audio jack switch simply gives the flexibility to support different headsets.  If you are only supporting CTIA you won't need the IC.

    If you remove R533 how will the audio signal get between the TS3A255E and the audio jack?  

    Please also review this posting to learn how the audio jack detection works which applies to all of TI audio jack switches.

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    TI__Mastermind 30301 points
    Hi Adam,
    Customer remove R533, so for Nokia type headphone the microphone would no function and apple type is workable , right ?



    BR,
    SHH
  • 0 in reply to SHH
    TI__Mastermind 45350 points

    SHH,

    Is there a good time that we can talk over the phone?  I don't think we are communicating properly about the function the TS3A227E provides and what the customer is trying to achieve in the system.  If you are only supporting one type of headset that has ground on Ring2 pin only and Mic on sleeve pin only you do not need to use the TS3A227E in they system. 

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    TI__Mastermind 30301 points
    Hi Adam,

    Customer only need to support CTIA type. The reason why cusotmer need to use TI part is in order to inform the system
    The currently detection cannot separate detect headphone and mic device. if plugging the headphone only device, the device manager will show mic and headphone in the same time.
    In order to avoid user use the headphone only device, but device manager show mic and headphone case.
    So customer need to use TS3A255E.

    If Customer remove R533, for Nokia type headphone the microphone would no function and apple type is workable , right ?

    BR,
    SHH
  • 0 in reply to SHH
    TI__Mastermind 45350 points

    SHH,

    The CTIA headset has the ground pin on Ring 2 of the audio jack.  The link to the schematic expired but if you pull down the Ring 2 pin to ground with a resistor then it will only support CTIA headsets and not the microphone on the OMTP headset because the microphone line will be grounded.

    I don't know the configuration and impedance of the Apple and Nokia headsets but if you permanently ground Ring 2 of the audio jack it will only sport the headset with the mic on sleeve. 

    I did a google search and it looks like some apple headsets have the ground on Ring2 which will work if you ground Ring 2.

    I did a google search and it looks like some Nokia headsets have the ground on Sleeve which will not work if you ground Ring 2.

    Thank you,

    Adam