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AN4038 Folha de dados(PDF) 14 Page - STMicroelectronics

Nome de Peças AN4038
Descrição Electrónicos  Guidelines to optimize proximity detection with STM8TL5xxx capacitive sensors
PDF  39 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4038 Folha de dados(HTML) 14 Page - STMicroelectronics

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STM8TL5xxx sensitivity setting
AN4038
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3.3
Detection threshold
The detection threshold (Dth) is the minimum value between the reference and the current
signal necessary to report a proximity detection. The Dth directly influences the detection
distance of the system. The lower Dth is, the higher the detection distance is.
Figure 11 shows the detection distance versus the Dth. This test was performed using
sensor #10 (see Figure 2).
Figure 11.
Detection distance versus detection threshold
The Dth value should be set higher than the noise amplitude to filter environmental noise
signals and to guarantee the stability of the system. Figure 12 shows the Dth versus noise.
This test was performed using sensor #10 (see Figure 2).
Figure 12.
Detection threshold versus noise



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