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AN4038 Datasheet(PDF) 34 Page - STMicroelectronics

Part # AN4038
Description  Guidelines to optimize proximity detection with STM8TL5xxx capacitive sensors
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4038 Datasheet(HTML) 34 Page - STMicroelectronics

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Environmental variation
AN4038
34/39
Doc ID 022686 Rev 1
6.2.2
Humidity influence
Humidity influences the detection range of the proximity system. Effectively, the dielectric
constant, known as epsilon (
εr) of the air varies with humidity. Figure 33 shows the air
permittivity variation versus relative humidity.
Figure 33.
Air permittivity variation versus relative humidity
This situation is already describe in Section 5: Front Panel. The higher
εr is, the easier it is
for an electrical field to pass through materials. If the relative humidity increases, the
detection range increases. Humidity variation is significant only with a relative humidity
greater than 70 %.



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