The Inductive Touch System Design Guide presents an overview of the typical sensor mechanical
structure and sensor electrical design for human machine interface (HMI) button applications. The
mechanical design chapter discusses several factors that impact button sensitivity, including metal
selection, sensor geometry, sensitivity dependence on target-to-coil distance, and mechanical isolations.
Two options of common layer stacks for inductive touch buttons are also presented. The sensor design
chapter focuses on flex PCB sensor electrical requirements and considerations for optimal sensitivity.