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AN2869 датащи(PDF) 19 Page - STMicroelectronics

номер детали AN2869
подробное описание детали  Guidelines for designing touch sensing applications
PDF  43 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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AN2869 датащи(HTML) 19 Page - STMicroelectronics

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AN2869
Surface electrode design
Doc ID 15298 Rev 6
19/43
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 key 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
MS18975V1
CH1
CH2
CH3
K1
K2
K3
CH4
K4
K5
K6
CH5
K7
K8
K9
CH6
K10
K11
K12
CH7
= keys pressed



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