Other Parts Discussed in Thread: TS3A225E, TS3A227E, TS3A26746E
Hello team,
Customer is using regular analog USB-C headset with TS3A226AE and working fine. They are needing to change the regular analog USB-C headset by splitting the headset receiver analog ground from headset microphone analog ground. The change is on the headset side only and needed to avoid crosstalk between receiver and mic.
To do this customer is connecting analog ground of headset receiver to USB-C digital ground. There is no change on TS3A design and no change for headset mic (Ring2 and Sleeve are the same).
The issue now is that the device will not switch to headset mode. So far, it seems that SW detects USB-C headset is plugged and apply mic bias to HS_MIC(MICP) since they can detect the mic bias on Sleeve or/and Ring2. That means S1 is on. However, it seems that either FET1 or FET2 is not on at all because the voltage/waveform of SLEEVE and RING2 is the same. So this issue seems something to do with TS3A226AE. If it can auto switch SLEEVE and RING2, then it should work because there is no change on SLEEVE and RING2 from mic point view.
Can you please help on what may be going on here?
Thanks,
Sepeedah