In both 3.5mm audio jack and USB Type-C connectors the location of the mic and ground signals from the audio accessory may appear on different pins in the system. For the 3.5 mm jack accessores the mic and gound signals can be on either sleeve or ring2 and for the USB Type-C connector the mic and ground signals may appear on SBU1 or SBU2 depending on which way the user plugs in the accessory.
The main purpose of the TI audio jacks is to solve this problem and switch the mic and ground signal from an audio accessory to the audio codec or ground. All 4 TI audio jacks TS3A26746, TS3A225E, TS3A226AE, and TS3A227E can perform this function in 3.5mm jack and USB Type-C jack applications. Below are some key points on when to use which device
- The TS3A26746 audio jack is the smallest cross point switch of the 4 switches but it does not have the automatic detection of the mic and ground signals that the other three devices have.
- The TS3A226AE is also a good choice when space is an issue but it doesn't have I2C control like the TS3A225E and TS3A227E
- The TS3A225E and TS3A227E have I2C control which allows customers to manually control each switch in the IC and provides feedback to the system of switch status, accessory insertion, etc.
- The TS3A227E is the newest fully featured device including key press detection.
Thank you,
Adam
