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AN4312 Datasheet(PDF) 19 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) 19 Page - STMicroelectronics

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AN4312
Surface sensor design
35
3.2
Touchkey matrix sensor
To extend the number of touchkeys, it is possible to implement the touchkey using a matrix
arrangement.
For further information, please refer to AN3236.
Figure 12. Simple matrix implementation
Hardware recommendations:
•
Touching one touchkey may induce sufficient capacitance change on other channels
•
Special care must be taken to avoid
–
Imbalanced electrodes
–
Columns and lines electrodes tracks too close in the user touchable area
MS18975V2
CH1
CH2
CH3
K1
K2
K3
CH4
K4
K5
K6
CH5
K7
K8
K9
CH6
K10
K11
K12
CH7
= touchkeys pressed



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