Texas Instruments LDC2112 / LDC2114 Inductive Sensors

Texas Instruments LDC2112 / LDC2114 Inductive Touch Buttons include an inductive sensing technology that enables touch button design. This feature can be done on various 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 the panel and protected from the environment. The LDC2112 / LDC2114 can reliably detect material deflections of less than 200nm. 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 a high rejection of noise and interference. The Texas Instruments LDC2112 / LDC2114 includes an ultra-low power mode for power on/off buttons in battery-powered applications.

Features

Low power consumption
- One button: 6µA at 0.625SPS
- Two buttons: 85µA at 20SPS
Configurable button scan rates
- 0.625SPS to 80SPS
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
- CISPR 22 Class B and CISPR 24 compliant
1.8V ± 5% supply voltage
–40°C to +85°C temperature range
Interface
- I²C
- Dedicated logic output per button

Applications

Touch buttons and force level measurements on different materials, including metal, plastic, and glass for
- Consumer electronics
  - Smartphones
  - Smartwatches and other wearable devices
  - Smart speakers
  - Tablets/PCs
  - Virtual reality headsets
  - Soundbars
- Industrial applications
  - Televisions
  - Handheld devices
  - Home appliances
  - HMI panels and keypads