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AN2869 bảng dữ liệu(PDF) 23 Page - STMicroelectronics

tên linh kiện AN2869
Giải thích chi tiết về linh kiện  Guidelines for designing touch sensing applications
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN2869 bảng dữ liệu(HTML) 23 Page - STMicroelectronics

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AN2869
Surface electrode design
Doc ID 15298 Rev 6
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Figure 16.
Interlaced patterned rotary sensor
3.4.3
Rotary sensor with central touchkey
It is possible to locate a touchkey in the centre of a rotary sensor. This touchkey has a lower
sensitivity compared to other single keys. To reduce the loss of sensitivity induced by the
center key on the rotary sensor, it is recommended to place the center key and rotary sensor
electrodes on the same acquisition bank. The pattern of the central key must be as
symmetrical as possible so that the loading effect on the rotary sensor is also symmetrical.
ai15093
0.2 - 0.3 mm
0.2 - 0.3 mm
0.2 - 0.3 mm
Full band width 2.0 - 4.0 mm
Tooth pitch
2.0 - 4.0 mm
2 mm
LEGEND:
Via between layers
10 % meshed ground plane
Copper electrode



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