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Texas Instruments Inductive Sensor (Inductive Proximity Sensor): In my PCB coil design, I am not using all available layers, should the unused PCB layers be GND layers?

sensor

Unused PCB layers do not have to be GND layers. However, it is important to create keepout areas at least on unused PCB layers in the coil area. Copper on the layers above and below the coil is considered a target and affects the readings and range.

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