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LDC0851 Stacked Coil Design Considerations

 

The LDC0851 inductive switch uses two inductor coils as the sensor inputs that are either arranged side by side or stacked. A stacked coil design refers to placing two coils on top of each other, which can be a useful coil arrangement for minimizing PCB area or creating a unidirectional sensor. This application report discusses the benefits and tradeoffs of a stacked coil design, including key factors to consider when trying to maximize sensing range.