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AN4038 Fiches technique(PDF) 33 Page - STMicroelectronics |
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AN4038 Fiches technique(HTML) 33 Page - STMicroelectronics |
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33 / 39 page  AN4038 Environmental variation Doc ID 022686 Rev 1 33/39 6.2 Temperature and humidity variation influence 6.2.1 Temperature influence A variation of the temperature induces a variation of the measured signal. STM8TL5xxx devices compensate this by slowly tracking environmental changes thanks to the ECS (environment control system). Figure 32 shows the acquisition signal variation versus temperature. Figure 32. Acquisition signal variation versus temperature A variation of the temperature ( ΔT) induces a variation of the signal burst count (ΔBC). This ΔBC variation depends on the device sensitivity. The higher the sensitivity is, the higher the burst count variation with temperature variation is. The ECS is able to compensate slow temperature variations but, an application subjected to fast and brutal temperature variation may give unstable proximity detections. Therefore, careful attention should be taken to avoid abrupt changes in temperature. Note that the decrease of the reference decreases the sensitivity. However, sensitivity can be compensated by the EPCC which is directly managed by the STM8TL5x STMTouch library. |
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