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STM8T141 Folha de dados(PDF) 28 Page - STMicroelectronics

Nome de Peças STM8T141
Descrição Electrónicos  Single-channel capacitive sensor for touch or proximity detection with shielded sensing electrode
PDF  50 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM8T141 Folha de dados(HTML) 28 Page - STMicroelectronics

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Design guidelines
STM8T141
28/50
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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