LDC2112/LDC2114 Inductive Touch Solutions

Texas Instruments' LDC2112 and LDC2114 are multi-channel low-noise inductance to digital converters with integrated algorithms to implement inductive touch applications. 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.

Texas Instruments' LDC2112 and LDC2114 devices employ an innovative LC resonator that offers high rejection of noise and interference. They can reliably detect material deflections of less than 200 nm.

The LDC2112 and LDC2114 include an ultra-low power mode intended for power on/off buttons in battery powered applications.

The LDC2112 and LDC2114 are available in a 16-pin DSBGA or TSSOP package. The 0.4 mm pitch DSBGA package has a very small 1.6 mm x 1.6 mm nominal body size with a maximum height of 0.4 mm. The 0.65 mm pitch TSSOP package has a 5 mm x 4.4 mm nominal body size with a maximum height of 1.2 mm.

Applications include touch buttons and force level measurements on a variety of materials, including metal, plastic, and glass.