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TS3A5018RGYR 开发手册 - TI（德州仪器）
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TI（德州仪器）
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模拟开关芯片
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VQFN-16
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TEXAS INSTRUMENTS TS3A5018RGYR 模拟开关, SPDT, 4 放大器, 10 ohm, 2.3V 至 3.6V, VQFN, 16 引脚
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TS3A5018RGYR数据手册
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1
SCDA014–March 2016
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Copyright © 2016, Texas Instruments Incorporated
Detecting Selfie Sticks Using TI Audio Jack Switches TS3A227E and
TS3A225E
Bluetooth is a registered trademark of Bluetooth SIG, Inc..
All other trademarks are the property of their respective owners.
Application Report
SCDA014–March 2016
Detecting Selfie Sticks Using TI Audio Jack Switches
TS3A227E and TS3A225E
Jamie Zhang, Adam Torma
ABSTRACT
Selfie sticks are becoming as common of a smart phone accessory as a pair of headphones. Because of
the selfie stick’s increasing popularity, smart phone manufacturers need to be able to accommodate the
accessory. This report describes the procedure required for a smart phone to detect when a selfie stick
accessory is inserted into a smart phone's audio jack receptacle using TI audio jack switches TS3A227E
and TS3A225E. It shows how these devices respond to common selfie-stick implementations and how to
adjust the audio jack switch’s register settings to accommodate both traditional audio accessories as well
as the new selfie stick accessory.
Contents
1 Selfie Stick Schematic Overview .......................................................................................... 2
2 TS3A227E and TS3A225E Selfie Stick and Accessory Detection Overview........................................ 3
3 How to Support a Selfie Stick Using TI’s Audio Jack Switches........................................................ 5
4 Conclusion .................................................................................................................. 10
Appendix A ....................................................................................................................... 11
List of Figures
1 Typical Selfie Stick Schematic............................................................................................. 2
2 TS3A227E Application Circuit With Closed Circuit From Ring2 To Tip Made With Headphone Accessory..... 3
3 TS3A227E Application Circuit With Open Circuit From Ring2 To Tip Schematic With Selfie Stick Inserted.... 3
4 TS3A227E Switch State After Manually Configuring Internal Switch Network to Support Selfie Stick........... 4
5 TS3A227E Switch State After Detecting a 4-Pole OMTP Headset ................................................... 4
6 Selfie Stick Usage Logic Flow ............................................................................................. 5
7 TS3A227E Switch State After Detecting a 3-Pole Headphone........................................................ 6
8 TS3A227E Switch State After Manually Configuring Internal Switch Network to Support Selfie Stick........... 7
9 Microphone Bias is High With Selfie Stick Inserted Into the Audio Jack Receptacle............................... 8
10 Microphone Bias is Low With 3-pole Headphones Inserted Into the Audio Jack Receptacle..................... 8
11 Typical Application Schematic With Headphone Accessory.......................................................... 12
12 TS3A227E Default Switch State With no Accessory Inserted ....................................................... 12
13 TS3A227E Switch State During Detection.............................................................................. 13
14 TS3A227E Switch State After Detecting a 3-Pole Headphone ...................................................... 13
15 TS3A227E Switch State After Detecting a 4-Pole OMTP Headset.................................................. 14
List of Tables
1 Audio Jack Plug Configurations .......................................................................................... 11
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