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AN4038 Datasheet(PDF) 32 Page - STMicroelectronics

No. de pieza AN4038
Descripción Electrónicos  Guidelines to optimize proximity detection with STM8TL5xxx capacitive sensors
PDF  39 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4038 Datasheet(HTML) 32 Page - STMicroelectronics

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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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