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AN4038 Datasheet(PDF) 32 Page - STMicroelectronics |
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AN4038 Datasheet(HTML) 32 Page - STMicroelectronics |
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32 / 39 page  Environmental variation AN4038 32/39 Doc ID 022686 Rev 1 6 Environmental variation 6.1 Power supply variation influence The stability of the device power supply is critical to provide a precise and repeatable capacitance measurement. Consequently, a linear regulator is embedded into STM8TL5xxx devices to provide the best power supply noise rejection possible. Even with the embedded regulator, variations of the power supply voltage may have an impact on the measured signal, especially in proximity configurations with a large acquisition gain and small sensitivity threshold. A variation of the power supply voltage ( ΔV) induces a variation of the signal burst count ( ΔBC). This variation depends on the sensitivity: a high sensitivity (high target reference) increases the effect of the power supply variation and can lead to an unstable proximity detection. Figure 31 shows the burst count signal variation with VDD variation from 1.8 V to 3.3 V with different target references. For this test, the system was calibrated at VDD = 3.3 V. Figure 31. Burst count variation versus VDD and target reference |
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