Automotive 4-channel inductance to digital converter for low-power proximity & touch-button sensing


Product details


Applications Inductive touch buttons, Encoders/event counters, Metal proximity detection Number of input channels 4 Vs (Max) (V) 1.89 Vs (Min) (V) 1.71 Operating temperature range (C) -40 to 125 TI functional safety category Functional Safety-Capable open-in-new Find other Inductive sensor AFEs

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TSSOP (PW) 16 open-in-new Find other Inductive sensor AFEs


  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • Functional Safety-Capable
  • 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 to LDC2114
  • Robust EMI performance allows for CISPR 22 and CISPR 24 compliance
  • Four independent channel operation
  • Configurable scan rates:
    • 0.625 SPS to 160 SPS
    • 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: 6 µA at 0.625 SPS
    • Two buttons: 72 µA at 20 SPS
  • Interface:
    • 1.8-V and 3.3-V compliant I2C and INTB
    • 1.8-V logic output per channel for buttons

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open-in-new Find other Inductive sensor AFEs


The LDC3114-Q1 is an inductive sensing device that enables touch button design for human machine interface (HMI) on a wide variety of materials 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-Q1 is able to automatically correct for any deformation in the conductive targets. The 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-Q1 includes an ultra-low power mode intended for power on/off buttons or position sensors in battery powered applications.

The LDC3114-Q1 is easily configured through an I2C interface. The LDC3114-Q1 is available in a 16-pin TSSOP package.

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Technical documentation

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Type Title Date
* Data sheet LDC3114-Q1 4-Channel Hybrid Inductive Touch and Inductance to Digital Converter datasheet Apr. 13, 2021
Application note LDC Target Design (Rev. B) May 13, 2021
Functional safety information LDC3114-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA Apr. 08, 2021
User guide BOOST-LDC3114EVM User's Guide Feb. 05, 2021
Application note Common Inductive and Capacitive Sensing Applications (Rev. A) Mar. 30, 2020
Application note EMI Considerations for Inductive Sensing Feb. 22, 2017

Design & development

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Hardware development

document-generic User guide

This EVM (evaluation module) is an easy-to-use platform for evaluating the main features and performance of the LDC3114. The EVM includes a graphical user interface (GUI) used to read and write registers as well as view and save measurement results. Also included is an integrated coil that can check (...)

  • Integrated coil for quick evaluation
  • GUI provided for quick and easy evaluation         

Design tools & simulation

SLYC137F.ZIP (984 KB)

CAD/CAE symbols

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Ordering & quality

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