• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 207 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TS3A227E: TS3A227E

Henry Lo
Prodigy 220 points
Part Number: TS3A227E

TS3A227E is running in hardware mode, there is NO i2c controlling it.


There is an pop noise happened on TIP pin when VDD power off and on as below pictures,

Could you please help to comment this root cause and solution for this?

  • 0
    TI__Mastermind 28308 points

    Hey Henry,

    The circuit looks fine from what was shown. Typically seeing where the pins go on the audio jack plug itself is also useful to confirm the pinout here as well if you have that.

    I am noticing quite a lot of noise on RING2 and Sleeve on power up as well. This shouldn't be there as well. Is this across multiple devices? 

    The device click/pop noise reduction circuitry is designed to reduce the click/pop noise when the device is turned on and an accessory is detected. Not necessarily when the device is powered up. The DFETs are used to reduce the humming noise by not allowing those inputs to be floating when powered down and instead it grounds the Sleeve and RING. The tip does not have a DFET. It looks like there may be some charge being released there when the device is turned on. Can we try pulling the tip pin low with a pulldown to GND when the device is turned off, then power the device on with that pulldown still there and see if the pop is still there? There may be some issues in the detection sequence here since you're adding resistor but that shouldn't be long term issue as this is to simply test if the solution will work. If this does work an external DFET or a switch to pull to ground when the device is off can be used here to shunt that TIP to GND when the device is turned off.

    Let me know if there any questions with regards to this and if I've been clear enough in my explanation. 

    Thanks,
    Rami