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AN4312 Datasheet(PDF) 22 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) 22 Page - STMicroelectronics

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Surface sensor design
AN4312
22/36
DocID024815 Rev 1
3.3.2
Interlaced patterned linear sensor
When using the charge transfer acquisition principle, it is possible to use only three
channels thanks to the higher resolution achieved.
Figure 17. Interlaced linear touch sensor with 3 channels / 4 electrodes
(half-ended electrodes design)
1. The teeth of the interlaced linear touch sensor must be perfectly regular.
MS32449V1
Legend:
Via between layers
10% meshed ground plane
Copper electrode
Up to 60 mm
Full band width 3.6 mm
Electrode gap 0.2~0.3 mm
Tooth pitch
2.4 mm
Squared end
0.2~0.3 mm
Electrode/ground
gap 2 mm



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