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AN3431 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN3431
Description  How to design a PresSense pressure touch button
Download  18 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3431 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN3431
2/18
Doc ID 019017 Rev 1
Contents
1
Principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Mechanical construction considerations . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
Stack up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1
Insulating layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.2
Conductive top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.3
Spacer layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.4
PCB layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.5
Mechanical bracket/support layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2
Application rigidity and adhesion of layers . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3
Size of the sensor pads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3
How to combine proximity detection with
PresSense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4
Implementation example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17


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