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AN4038 データシート(PDF) 33 Page - STMicroelectronics

部品番号 AN4038
部品情報  Guidelines to optimize proximity detection with STM8TL5xxx capacitive sensors
PDF  39 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4038 データシート(HTML) 33 Page - STMicroelectronics

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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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