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AN4038 bảng dữ liệu(PDF) 12 Page - STMicroelectronics

tên linh kiện AN4038
Giải thích chi tiết về linh kiện  Guidelines to optimize proximity detection with STM8TL5xxx capacitive sensors
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN4038 bảng dữ liệu(HTML) 12 Page - STMicroelectronics

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STM8TL5xxx sensitivity setting
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3.2
Target reference
The target reference determines the gain of the system. The influence of the target
reference on the detection distance is illustrated in Figure 8. This test was performed with a
fixed detection threshold value using sensor #10 (see Figure 2).
Figure 8.
Detection distance versus target reference with fixed detection threshold
Note:
The detection threshold value is fixed at 30 regardless of the target reference.
The higher the target reference is, the better the detection distance is. Increasing the target
reference, also increases the acquisition time as more charge transfer cycles are required.
The choice of sensitivity directly influences noise on the acquisition signal. Noise increases
when sensitivity increases. Figure 9 shows the influence of the target reference on the noise
standard deviation and on the maximum noise delta variation (signal - reference). This test
was performed using sensor #10 (see Figure 2).



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