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AN4038 bảng dữ liệu(PDF) 17 Page - STMicroelectronics |
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AN4038 bảng dữ liệu(HTML) 17 Page - STMicroelectronics |
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17 / 39 page  AN4038 STM8TL5xxx sensitivity setting Doc ID 022686 Rev 1 17/39 3.5 Approach speed and environmental change The STM8TL5xxx can compensate environmental change thanks to the ECS (environment control system) feature. Power supply voltage, temperature, and air humidity variation may induce a slow variation of the acquisition signal. The ECS mechanism forces the reference to follow slow evolutions of the signal. It is based on a infinite response digital low pass filter. The sampling frequency of the low pass filter is programmable. The low pass filter uses a coefficient ‘K’. The higher K is, the faster the response is. Figure 14 shows the delta signal variation (current measurement - reference) versus distance between a hand and an electrode. This measurement was performed with electrode #10 (refer to Figure 2) with a target reference of 300 burst counts. Figure 14. Delta burst count versus hand distance A hand moving at a constant speed causes a higher delta variation (larger projected capacitance variation) nearer the sensor plate than when it is far from it. Depending on the desired approach speed for the proximity system, the ECS can compensate part of the variation induced by the approach of a hand/finger. This occurs mainly when the hand/finger is far from the electrode and has entered the electrode field. In this case, the detection distance can be reduced by the ECS feature. In most applications, the default ECS K factor is fine, but for slow speed approach detection needs, the K factor can be increased to slow down the ECS. |
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