The LDC3114 is an inductive sensing device that enables touch-button design for human machine interface (HMI) on a wide variety of materials by measuring small deflections of conductive targets using a coil that can be implemented on a small printed circuit board (PCB) located behind the panel. This technology can be used for precise linear position sensing of metal targets for automotive, consumer, and industrial applications by allowing access to the raw data representing the inductance value. Inductive sensing solution is insensitive to humidity or non-conductive contaminants such as oil and dirt.

This device works by utilizing an inductive coil with a parallel capacitor to implement an LC tank. The LC tank has a resonant operating frequency that changes as a metal target interacts with the magnetic field generated by the planar inductor coil. Because of this magnetic field operating at a resonant frequency designed for a specific application, the electromagnetic interference of the system needs to be tested to ensure it meets the required specifications of the application.

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