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Headphone jack swicth that support iOS & Android, support USB and apply CTIA conn rule

daniel
Genius 5095 points
Other Parts Discussed in Thread: TS5USBA224, BQ24392

Hi,

My customer are studying for RFQ which is relative to Headphone jack that support iOS & Android, support USB and apply CTIA conn rule.

They want to support charge function through the audio jack too, that can support cable as below:

The concept is as below:

1. Do we have this kind design that can support switch for jack and USB?

2. How does the VBUS signal on 3.5mm connecter?

3. How can the switch identify the input source type?(adapter, usb)

4. Does TS5USBA224 meet this requist? Or need to use TS3A22x family? please provide suitable solution.

Thanks

Daniel

  • 0
    TI__Mastermind 45430 points

    Daniel,

    I am a little confused what you are trying to ask but I will try to get a dialog going. 

    1. Do we have this kind design that can support switch for jack and USB?

    We have USB muxes that can mux USB data from a USB 2.0 PHY and Audio signals from a codec onto one port with the TS5USBA224.

    2. How does the VBUS signal on 3.5mm connecter?

    The USB type A connector has 4 conductors and the 3.5mm jack has 4 conductors.  Typically the name of the 4 conductors in USB type A connectors are  VBUS, D+, D-, and GND and the names of the 4 conductors  in the 3.5mm connectors are Left, Right, Microphone, and Ground.  It is possible that you can map the 4 conductors in the 3.5mm jack to the 4 conductors on the USB Type A connector

    3. How can the switch identify the input source type?(adapter, usb)

    Majority of the TI signal switches switch between signal paths using a GPIOs. 

    There are some switches that have accessory detection features that read the impedance of the ID pin of the (5 conductor VBUS, D+,D-,ID, and GND) microA/B or miniA/B USB connectors like the TSUXXXX family.

    There are devices like the BQ24392 that can detect which type of charger accessory is inserted into a USB connector by measuring the impedance on D+ and D- lines.

    4. Does TS5USBA224 meet this requist? Or need to use TS3A22x family? please provide suitable solution.

    The main difference between the TS5USBA224 and the TS3A2236X family is TS5USBA224 has a signal path that handle the USB 2.0 bandwidth requirement while the TS3A2236X family can not. 

    Let me know you thoughts.

  • 0 in reply to Adam Torma
    Genius 5095 points

    Dear Adam,

    Thanks for your answer.

    I thinks the  block diagram is about as below. Please correct me if it's wrong. 

    1. Is the VBUS on Tip pin? Is the pin defination a public regulations? I think VBUS should at sleeve pin, so the power would not touch to other pin when plug in.

    2. For detect method. The USB connecter is typeA (4pin) only for connceting adapter directly.

    So the only way to identify source type is measuring the impedance on D+ and D- lines?

    As your first picture, can i use the sleeve pin to detect by processor?

    If processor detect VBUS on sleeve pin, it switches  TS5USBA224 to D+/D-, and another switch in my picture switched to charger IC.

    If processor detect no VBUS on sleeve pin (MIC), it switches  TS5USBA224 to AUDR/L, and another switch switched to mic.

    Is it possible to achieve?

    Thanks.

  • 0 in reply to daniel
    TI__Mastermind 45430 points

    Daniel,

     

    I'm still confused about your application. You show a picture of a cable with USB A connector on one side and 3.5mm jack on the other side of the cable.  All you need to do to make a cable like that is have 4 conductors run through the cable.  Why do you need and ICs in the cable?

    1. Is the VBUS on Tip pin? Is the pin defination a public regulations? I think VBUS should at sleeve pin, so the power would not touch to other pin when plug in.

    The diagram I drew above was a generic example showing that it could be possible to have 4 conductors of USB type A map to 4 conductors of 3.5 mm audio jack.  I have not seen any pin definitions or public regulations of this application. It appears you are making a highly custom device for a very specific application.  I have not yet seen anything like this.   

    The closest thing I have seen is potentially having a USB type C jack support audio signals per the USB specification. 

    2. For detect method. The USB connecter is typeA (4pin) only for connceting adapter directly.

    The best way to detect if you have inserted a USB type A connector is to monitor the VBUS pin.  This detection is done on the device side to let the device know that a device with a voltage on VBUS has been inserted.

    So the only way to identify source type is measuring the impedance on D+ and D- lines?

    Yes, measureing the impedance on the D+ and D- is the way the USB standard states to identify the type of USB accessory is being inserted into a device.

    As your first picture, can i use the sleeve pin to detect by processor?

    If processor detect VBUS on sleeve pin, it switches  TS5USBA224 to D+/D-, and another switch in my picture switched to charger IC.

    If processor detect no VBUS on sleeve pin (MIC), it switches  TS5USBA224 to AUDR/L, and another switch switched to mic.

    Is it possible to achieve?

    Yes that is a logical explanation solution, but why is there a processor on your cable?

     

    Thank you,

    Adam