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AN4312 Datasheet(PDF) 24 Page - STMicroelectronics

Part # AN4312
Description  Guidelines for designing touch sensing applications with surface sensors
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4312 Datasheet(HTML) 24 Page - STMicroelectronics

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Surface sensor design
AN4312
24/36
DocID024815 Rev 1
3.4.2
Interlaced patterned rotary sensors
Like for the linear sensor, the size of the rotary sensor can be increased by using the
interlaced pattern design.
This allows a smoother transition and a higher sensitivity. To cover a large range of sizes,
more teeth are added inside the rotary touch sensor rather than increasing the size of an
individual tooth.
Figure 19. Interlaced patterned rotary sensor with 3 channels / 3 electrodes
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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