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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM8T141 датащи(PDF) 28 Page - STMicroelectronics |
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STM8T141 датащи(HTML) 28 Page - STMicroelectronics |
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28 / 50 page  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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