Texas Instruments LDC3114/LDC3114-Q1 Inductance-to-Digital Converter


Texas Instruments LDC3114/LDC3114-Q1 Inductance-to-Digital Converter is an inductive sensing device that enables touch button design for human-machine interface (HMI) on a wide variety of materials. This feature is done by measuring small deflections of conductive targets using a coil that can be implemented on a small printed circuit board (PCB) located behind the panel. This technology can be used for precise linear position sensing of metal targets for automotive, consumer, and industrial applications by allowing access to the raw data representing the inductance value. Inductive sensing solution is insensitive to humidity or non-conductive contaminants such as oil and dirt.

The button mode of LDC3114/LDC3114-Q1 can automatically correct for any deformation in the conductive targets. The LDC3114/LDC3114-Q1 offers well-matched channels, which allow for differential and ratiometric measurements which enable compensation of environmental and aging conditions such as temperature and mechanical drift. The LDC3114/LDC3114-Q1 includes an ultra-low power mode for power on/off buttons or position sensors in battery-powered applications.

The Texas Instruments LDC3114/LDC3114-Q1 is easily configured through an I2C interface. The LDC3114/LDC3114-Q1 is available in a 16-pin TSSOP package. The LDC3114-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • Multiple modes of operation
    • Raw data mode: access pre-processed inductance measurement data to enable advanced algorithms on MCU for linear sensing
    • Button mode: button press detection with baseline tracking and advanced on-chip post-processing
  • Force level measurement of touch buttons
  • Pin and register compatible with LDC2114
  • Robust EMI performance allows for CISPR 22 and CISPR 24 compliance
  • Four independent channel operation
  • Configurable scan rates
    • 0.625SPS to 160SPS
    • Continuous scanning option
  • Advanced button press detection algorithms
    • Adjustable force threshold per button
    • Environmental shift compensation
    • Simultaneous button press detection
  • Low current consumption
    • One button: 6µA at 0.625SPS
    • Two buttons: 72µA at 20SPS
  • Temperature range
    • TSSOP (16): –40°C to +125°C
  • Interface
    • 1.8V and 3.3V compliant I2C and INTB
    • 1.8V logic output per channel for buttons

Block Diagram

more information: https://www.ti.com/product/LDC3114-Q1



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