Designed for inductive touch sensing, the LDC2114 evaluation module (EVM) for the LDC2112 and LDC2114 inductive touch solutions from Texas Instruments, is available from distributor, Mouser. It is the first distributor to offer the module which demonstrates the use of inductive sensing to detect and measure the presence of conductive objects to implement inductive touch buttons. The LDC2114EVM features the LDC2114, a multi-channel, low-noise inductance-to-digital converter optimised for inductive touch applications on monolithic surfaces.

Inductive sensing technology enables touch button design on a 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 compact PCB located behind a panel and protected from the environment.

The module is available exclusively from Mouser Electronics. It can connect up to four buttons using the LDCCOILEVM or customised coils designed using the WeBench Inductive Sensing Designer. The board offers integrated and configurable algorithms for button press detection with onboard LED indicators. The LDC2114 consumes just 6.0 microA at 0.625sample/s. Designers can configure the device at different duty cycles to optimize the power consumption of their system.

The two-channel LDC2112 and four-channel LDC2114 devices employ an inductive-capacitive (LC) resonator that offers high rejection of noise and interference, with a range of oscillation frequencies from 1.0 to 30MHz. Both have adjustable sensitivity per input channel to detect material deflections of less than 200nm with a wide range of physical button structures and materials. The high-resolution measurement enables multi-level buttons to be used in designs.

The LDC2112 and LDC2114 devices can operate in an ultra-low-power mode or can be toggled into a higher scan rate for more responsive button press detection for game play or other low-latency applications. The devices are configured through 400Hz I2C, and the only external components necessary for operation are supply bypass capacitors and a COM pin capacitor to ground. Both devices can be used for smartphones, wearable devices, tablets and PCs, virtual reality headsets, remote controls, and human-machine interface (HMI) panels and keypads.

http://www.mouser.com/new/Texas-Instruments/ti-ldc2112-ldc2114-sensors/


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