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STM8T143 bảng dữ liệu(PDF) 36 Page - STMicroelectronics

tên linh kiện STM8T143
Giải thích chi tiết về linh kiện  Single-channel capacitive sensor for touch and proximity detection
PDF  65 Pages
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STM8T143 bảng dữ liệu(HTML) 36 Page - STMicroelectronics

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Design guidelines
STM8T143
36/65
DocID18315 Rev 6
8
Design guidelines
8.1
Sensitivity adjustment
Several factors impact device sensitivity:
•
The sensing electrode material and size
•
The touch panel material and thickness
•
The board layout and in particular the sensing signal tracks
•
The ground coupling of the object (finger or hand) and sensor
•
The touch or proximity detection threshold selected
8.1.1
PCB layout and construction
The PCB traces, wiring, and components associated or in contact with CX pins become
touch sensitive and should be treated with caution to limit the touch area to the desired
location.
Even with AET it is important to limit the amount of stray capacitance on the CX pin. This can
be done by minimizing trace lengths and widths. To minimize cross-coupling, tracks from
adjacent sensing channel should not run close to each other for long distances. For detailed
information, refer to application note AN2869.



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