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.
● Low Power Consumption:
● One Button: 6 µA at 0.625 SPS
● Two Buttons: 72 µA at 20 SPS
● Configurable Button Scan Rates:
● 0.625 SPS to 80 SPS
● Force Level Measurement of Touch Buttons
● Independent Channel Operation:
● Two Channels for LDC2112
● Four Channels for LDC2114
● Integrated Algorithms to Enable:
● Adjustable Force Threshold per Button
● Environmental Shift Compensation
● Simultaneous Button Press Detection
● Supports Independent Operation without MCU
● Robust EMI Performance:
● Allows for CISPR 22 and CISPR 24 Compliance
● Operating Voltage Range: 1.8 V ± 5%
● Temperature Range: –40 °C to +85 °C
● Interface:
● I2C
● Dedicated Logic Output per Channel
