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AN2869 Scheda tecnica(PDF) 21 Page - STMicroelectronics

Il numero della parte AN2869
Spiegazioni elettronici  Guidelines for designing touch sensing applications
PDF  43 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2869 Scheda tecnica(HTML) 21 Page - STMicroelectronics

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AN2869
Surface electrode design
Doc ID 15298 Rev 6
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3.3.2
Interlaced linear sensor
When using the charge transfer acquisition principle, it is possible to use only three
elements thanks to the higher resolution achieved. This sensor type is not compatible with
the RC acquisition principle due to the lower sensitivity supported.
Figure 14.
Interlaced linear touch sensor with three elements (up to 60 mm long)
1.
The teeth of the interlaced linear touch sensor must be perfectly regular.
ai15091
Full band width 3.6 mm
Squared end
0.2 - 0.3 mm
Electrode gap 0.2 - 0.3 mm
LEGEND:
Via between layers
10 % meshed ground plane
Copper electrode
gap 2 mm
Electrode/ground
Tooth pitch
2.4 mm



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