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STM8T141 bảng dữ liệu(PDF) 28 Page - STMicroelectronics

tên linh kiện STM8T141
Giải thích chi tiết về linh kiện  Single-channel capacitive sensor for touch or proximity detection with shielded sensing electrode
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STM8T141 bảng dữ liệu(HTML) 28 Page - STMicroelectronics

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Design guidelines
STM8T141
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Doc ID 15699 Rev 7
8.3
Influence of power supply variation
The stability of the device power supply is critical in order to provide a precise and
repeatable capacitance measure. For this reason, a linear regulator is embedded into the
device 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 detection threshold.
A variation of the power supply voltage (
V) induces a variation of the signal burst count
(
BC) according to Equation 1.
Equation 1
The gain, G, of the acquisition is the ratio Cs/Cx.
The parameter
Ϭ is the power supply rejection ratio.
For stability reasons, it is advised to limit
BC to less than half the detection threshold. If
VDD is less than 2.9 V, special care should be taken of the supply quality. An external
voltage regulator may be necessary.
BC
G
V
=



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