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AN4038 bảng dữ liệu(PDF) 27 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Guidelines to optimize proximity detection with STM8TL5xxx capacitive sensors
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AN4038 bảng dữ liệu(HTML) 27 Page - STMicroelectronics

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AN4038
Proximity sensor design
Doc ID 022686 Rev 1
27/39
Figure 26 shows the measured detection distance versus the distance between the ground
backplane and the sensor for a dielectric epoxy material (FR4). This test was performed
using sensor #3 (see Figure 1).
Figure 26.
Detection distance versus distance between ground plane and electrode
for dielectric material (FR4)
Detection distance significantly decreases for an FR4 dielectric thickness less than 10 mm.
For an FR4 dielectric thickness above 10 mm to maximum thickness, the increase of the
proximity detection distance levels off.
With regard to the dielectric epsilon factor (permittivity), at the same dielectric thickness, the
lower the dielectric epsilon is, the greater the proximity detection distance is.
The permittivity (dielectric constant) for:
●
FR4 is 4.2
●
Air is around 1



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