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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM8T143AM62T датащи(PDF) 21 Page - STMicroelectronics |
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STM8T143AM62T датащи(HTML) 21 Page - STMicroelectronics |
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21 / 65 page  DocID18315 Rev 6 21/65 STM8T143 STM8T143 processing 64 5.5 Environment control system (ECS) 5.5.1 ECS principle The acquired signal value of the capacitive sensing channel increases or decreases according to environmental conditions such as temperature, power supply, moisture, and surrounding conductive objects. The STM8T143 includes a built-in digital infinite impulse response (IIR) filter capable of tracking slow changes in the environment. It is called the environment control system (ECS). This is a low pass filter with a gain of one. The filter makes the reference follow slow changes of the signal while fast changes are recognized as a touch or proximity. Figure 12. IIR filter formula Note: If a touch or proximity is detected, the ECS is disabled for the duration of the reference freeze timeout. In this case, Yn = Yn_1. As soon as the reference freeze times out or the detection ends, the filter is set as active again. |
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