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AN4038 Scheda tecnica(PDF) 31 Page - STMicroelectronics

Il numero della parte AN4038
Spiegazioni elettronici  Guidelines to optimize proximity detection with STM8TL5xxx capacitive sensors
PDF  39 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4038 Scheda tecnica(HTML) 31 Page - STMicroelectronics

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AN4038
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Doc ID 022686 Rev 1
31/39
Figure 30 shows a comparison of the distance between a hand and the sensor and a hand
and the front panel. This test was performed with an acrylic front panel material.
Figure 30.
Detection distance versus front panel thickness
Note:
Measurements performed with sensor board #3 (see Figure 1).
The thicker the front panel is, the greater the total detection distance is between the hand
and the electrode, but the distance between the hand and the front panel decreases.
An electrode with a thin front panel glued onto it compared to an electrode without a front
panel does not significantly influence detection range. The front panel only increases the
projected capacitance.



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