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AN4038 Datasheet(PDF) 29 Page - STMicroelectronics

Part # AN4038
Description  Guidelines to optimize proximity detection with STM8TL5xxx capacitive sensors
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4038 Datasheet(HTML) 29 Page - STMicroelectronics

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AN4038
Proximity sensor design
Doc ID 022686 Rev 1
29/39
Figure 28.
Detection area and detection distance versus ground surrounding
Surrounding the electrode plate can improve the directivity of the proximity detection, but
clearly reduces the detection range.
In conclusion, a ground backplane or ground surrounding close to the sensor plates
drastically reduces the detection distance. It is strongly advised to keep the ground
backplane or ground surrounding at a distance from the sensor. This helps maintain
proximity sensitivity of the application.



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