Inductive sensing technology enables touch button design for human machine interface
(HMI) on a wide variety of materials such as metal, glass, plastic, and wood, by measuring small
deflections of conductive targets. The sensor for an inductive touch system is a coil that can be
implemented on a small PCB located behind the panel and protected from the environment. Inductive
sensing solution is insensitive to humidity or non-conductive contaminants such as oil and dirt. It
is able to automatically correct for any deformation in the conductive targets.
The LDC2112/LDC2114 is a multi-channel low-noise inductance to digital converter with
integrated algorithms to implement inductive touch applications. The device employs an innovative
LC resonator that offers high rejection of noise and interference. The LDC2112/LDC2114 can reliably
detect material deflections of less than 200 nm.
The LDC2112/LDC2114 includes an ultra-low power mode intended for power on/off buttons in
battery powered applications.
The LDC2112/LDC2114 is available in a 16-pin DSBGA or TSSOP package. The 0.4 mm pitch
DSBGA package has a very small 1.6 × 1.6 mm nominal body size with a maximum height of 0.4 mm. The
0.65 mm pitch TSSOP package has a 5.0 × 4.4 mm nominal body size with a maximum height of 1.2 mm.
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