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AN4038 Datasheet(PDF) 12 Page - STMicroelectronics |
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AN4038 Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 39 page  STM8TL5xxx sensitivity setting AN4038 12/39 Doc ID 022686 Rev 1 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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