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TS3A225E Automatic Detection Sequence

Harsha Mahadevaiah
Prodigy 20 points
Other Parts Discussed in Thread: TS3A225E

Hello,

1. How will TS3A225E differentiate between normal single ended and normal differential (page 19 of the datasheet)?

2. Can anybody provide me more information about the automatic detection sequence.

3. Also, the headphone jack normally available(SJ-4351 from Cui.Inc) has switch on Tip or Ring or on both. In which case I need to add decoupling-capacitors on these lines (biasing for switch) for "DET_TRIGGER" to detect the insertion. Thereby making it a non-capless design. Can anybody tell me what  make are those headphone jacks?

Regards,

Harsha.M

  • 0
    TI__Mastermind 45575 points

    1. How will TS3A225E differentiate between normal single ended and normal differential (page 19 of the datasheet)?

               This will be something you program in to the 0x02 register through I2C as you have correctly identified on page 19 of the datasheet.

    2. Can anybody provide me more information about the automatic detection sequence.

                   After insertion and a low to high transition on DET_TRIGGER, a 120 ms de-bounce period is started. After this the TS3A225E runs a TI proprietary detection algorithm on the jack to determine what type of headset it is.  After detection has completed the system is notified.

    3. Also, the headphone jack normally available(SJ-4351 from Cui.Inc) has switch on Tip or Ring or on both. In which case I need to add decoupling-capacitors on these lines (biasing for switch) for "DET_TRIGGER" to detect the insertion. Thereby making it a non-capless design. Can anybody tell me what make are those headphone jacks?

                   We don’t provide a recommended jack part number because parts can NRND or a manufacturer can go out of business leaving a dead link in our datasheet.  Also many end equipment manufacturers have custom jacks developed for them and we simply provide guidelines for choosing the best jack on page 24 of the datasheet. 

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Prodigy 20 points

    Hello Adam,


    If one uses a differential headphone, the necessity of having a ground will not arise, am i correct? ground will be needed for the mic alone. So what is use of having a switch in such cases?


    How can I get more information about the TI proprietary detection algorithm?  Do we need to sign a NDA  to get the full datasheet and the EVM?

    Best Regards,

    Harsha.M

  • 0 in reply to Harsha Mahadevaiah
    TI__Expert 6395 points

    Hello Harsha,

    You are correct, but you do need the switch so you can float the ground line.  Normally in a system the ground is hard tied to the SLEEVE or RING2 pins.

    As for the detection algorithm I cannot divulge more information unfortunately.  Is there a reason why knowing the algorithm is needed?

    Regards,

    Andrew