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AN4038 bảng dữ liệu(PDF) 16 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) 16 Page - STMicroelectronics

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STM8TL5xxx sensitivity setting
AN4038
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Doc ID 022686 Rev 1
3.4
Electrode parasitic capacitance compensation (EPCC)
The EPCC compensates part of the projected capacitance to achieve the target reference
value. The target reference is the gain defined by the ratio:
Figure 13 shows the EPCC variation versus the target reference. This test was performed
using sensor #10 (see Figure 2).
Figure 13.
EPCC variation versus target reference
At a fixed CS capacitance, the higher the selected target reference value is, the higher the
CEPPC value is to compensate the CX capacitance.
To guarantee optimum system performance, it is recommended to check that the EPCC
value, after calibration, is in the range 20 < EPCC < 230. This ensures a sufficient operating
margin to adapt the system to environmental or mechanical changes.
C
S
C
X
C
EPPC
–
()
⁄



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