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AN3150 Datasheet(PDF) 13 Page - STMicroelectronics

Part # AN3150
Description  Guidelines to optimize proximity detection with STM8T141 and STM8T143 capacitive sensors
PDF  25 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3150 Datasheet(HTML) 13 Page - STMicroelectronics

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DocID17048 Rev 3
13/25
AN3150
Proximity sensing electrode design
24
Figure 6. PCB layout of test electrodes
Characteristics of electrodes 1 to 9 are summarized in Table 2.
Table 2. Electrode descriptions and characteristics
Electrodes
Description
(shape, size, plane)
Conductive
area
Cx
1
Spiral, 400mm2, no plane
Spiral, 400mm2, ground plane
218mm2
1,27pF
10,98pF
0,75pF
2
Loop, 400mm2, no plane
Loop, 400mm2, ground plane
40mm2
1,1pF
3,98pF
0,32pF
3
Plain, 400mm2, no plane
Plain, 400mm2, ground plane
400mm2
1,57pF
11,62pF
0,75pF
4
Spiral, 100mm2, no plane
Spiral, 100mm2, ground plane
57,5mm2
0,87pF
3,84pF
0,27pF
5
Loop, 100mm2, no plane
Loop, 100mm2, ground plane
20mm2
0,85pF
2,5pF
0,26pF



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