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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2869 датащи(PDF) 12 Page - STMicroelectronics |
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AN2869 датащи(HTML) 12 Page - STMicroelectronics |
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12 / 43 page  Main capacitive sensing guidelines AN2869 12/43 Doc ID 15298 Rev 6 Table 3. Dielectric constants of common materials used in a panel construction Sensitivity A useful parameter to consider with panel material and thickness (T) is the electric field equivalent vacuum thickness TV. Equation 1 where t is the thickness of the dielectric. TV is the thickness of vacuum with an electric field conduction equivalent to that of the material. The smaller it is, the easier the field can reach through. Panels with the same TV make keys with identical sensitivity. This works for both directions of course and may be used to evaluate the touch sensitivity from the back side of the application. For a panel built from a stack of different materials, it is possible to add the vacuum equivalent thickness of each layer: Equation 2 Each material has an influence on the sensitivity. So the equation can be used when, for example, the electrodes are on the bottom surface of the PCB substrate, then the thickness and ε R of the substrate will be also factors of the global sensitivity. Material ε R Air 1.00059 Glass 4 to 10 Sapphire glass 9 to 11 Mica 4 to 8 Nylon 3 Plexiglass 3.4 Polyethylene 2.2 Polystyrene 2.56 Polyethylene terephthalate (PET) 3.7 FR4 (fiberglass + epoxy) 4.2 PMMA (Poly methyl methacrylate) 2.6 to 4 Typical PSA 2.0 - 3.0 (approx.) T V t ε R ------ = T VSTACK () T V layers () ∑ = |
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