The LDC2114EVM features the LDC2114, a multi-channel low-noise inductance-to-digital converter optimized for inductive touch applications on monolithic surfaces. Inductive sensing technology enables touch button design 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, compact PCB located behind a panel and protected from the environment.
The LDC2114EVM can connect up to four buttons using the LDCCOILEVM or customized 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 as little as 6 µA at 0.625 samples per second, and designers can configure the device at different duty cycles to optimize the power consumption of their system.
TI's LDC2112/LDC2114 inductive touch solutions, now available to order from Mouser Electronics, are 1.8 V, multi-channel low-noise inductance-to-digital converters with integrated algorithms to implement inductive touch applications. The two-channel LDC2112 and four-channel LDC2114 devices employ an innovative inductive-capacitive (LC) resonator that offers high rejection of noise and interference, with a wide range of oscillation frequencies from 1 MHz to 30 MHz. With adjustable sensitivity per input channel, the LDC2112/LDC2114 can reliably detect material deflections of less than 200 nm with a wide range of physical button structures and materials. The high-resolution measurement further enables the implementation of multi-level buttons.
The LDC2112/LDC2114 devices can operate in an ultra-low power mode of 6 µA for optimal battery life, 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 400 Hz I2C, and the only external components necessary for operation are supply bypass capacitors and a COM pin capacitor to ground. The LDC2112/LDC2114 devices are ideal for smartphones, wearable devices, tablets and PCs, virtual reality headsets, remote controls and human-machine interface (HMI) panels and keypads.