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AN2869 bảng dữ liệu(PDF) 36 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) 36 Page - STMicroelectronics

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Doc ID 15298 Rev 6
4.1.3
H type sensor two layers
In this implementation, the Tx electrode forms an H, and the Rx electrode is a wire which
lies on the Tx square. There is an isolating material between them, and Tx square electrode
is hollow under the Rx electrode (see Figure 30). Obviously, this kind of touchkey is made of
two layers.
Figure 30.
Two-layer implementation
4.2
Linear sensor
An example of a linear sensor with five parcels is described in Figure 31. This kind of linear
touch sensor is fine when each parcel is about 6 mm to 10 mm and it could have N parcels.
So, for an overall length L, you can calculate the parcel number: N = L / parcel size (adjust
the parcel size to obtain N as an integer).
d
1/4L
1/4L
1/4L
1/4L
1/4L
1/2L
1/4L
1/8L
L
Rx
Tx
panel
PCB
0.2 to 0.5 mm
H sensor (cross section)
bottom
MS18986V2
L



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