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LDC3114

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

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Data sheet

LDC3114

ACTIVE
Data sheet Order now

Product details

Applications Encoders/event counters, Inductive touch buttons, Metal proximity detection Number of input channels 4 Vs (max) (V) 1.89 Vs (min) (V) 1.71 Rating Catalog Operating temperature range (°C) -40 to 125
Applications Encoders/event counters, Inductive touch buttons, Metal proximity detection Number of input channels 4 Vs (max) (V) 1.89 Vs (min) (V) 1.71 Rating Catalog Operating temperature range (°C) -40 to 125
TSSOP (PW) 16 32 mm² 5 x 6.4
  • 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
  • Temperature range
    • TSSOP (16) : –40°C to +125°C
  • Interface:
    • 1.8-V and 3.3-V compliant I2C and INTB
    • 1.8-V logic output per channel for buttons
  • 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
  • Temperature range
    • TSSOP (16) : –40°C to +125°C
  • Interface:
    • 1.8-V and 3.3-V compliant I2C and INTB
    • 1.8-V logic output per channel for buttons

The LDC3114 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 is able to automatically correct for any deformation in the conductive targets. The LDC3114 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 includes an ultra-low power mode intended for power on/off buttons or position sensors in battery powered applications.

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

The LDC3114 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 is able to automatically correct for any deformation in the conductive targets. The LDC3114 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 includes an ultra-low power mode intended for power on/off buttons or position sensors in battery powered applications.

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

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Technical documentation

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Type Title Date
* Data sheet LDC3114 4-Channel Hybrid Inductive Touch and Inductance to Digital Converter datasheet PDF | HTML 16 Dec 2021
Application brief Innovative Sensing Solutions for Home Appliances (Rev. A) PDF | HTML 11 Apr 2023
Application note Inductive Touch System Design Guide for HMI Button Applications (Rev. A) PDF | HTML 13 Feb 2023
Technical article Increasing surgical drill trigger precision and control with inductive and Hall-ef PDF | HTML 14 Oct 2022
Application note Electromagnetic Interference Testing Using the LDC3114 PDF | HTML 07 Jun 2022
EVM User's guide BOOST-LDC3114 Evaluation Module User's Guide (Rev. B) PDF | HTML 25 Apr 2022
Application note Design Considerations for Inductive Touch Buttons for Human-to-Machine Interface (Rev. B) PDF | HTML 12 Apr 2022
Application note Replacing Mechanical Switches With Inductive Sensors PDF | HTML 08 Apr 2022
Application note Inductive Sensing for LDC3114 Metal Proximity Detection PDF | HTML 06 Aug 2021
Application note Inductive Touch – Configuring LDC2114 and LDC3114 Touch-Button Sensitivity (Rev. B) PDF | HTML 28 Jul 2021
Application note LDC211x and LDC3114 Internal Algorithm Functionality (Rev. A) PDF | HTML 01 Jul 2021
Application note Common Inductive and Capacitive Sensing Applications (Rev. B) PDF | HTML 22 Jun 2021
Application brief Inductive Touch Buttons for Wearables (Rev. A) PDF | HTML 22 Jun 2021
Application note Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) (Rev. A) PDF | HTML 16 Jun 2021
Application note LDC Device Selection Guide (Rev. D) PDF | HTML 15 Jun 2021
Application note Sensor Design for Inductive Sensing Applications Using LDC (Rev. C) PDF | HTML 21 May 2021
Application note LDC Target Design (Rev. B) PDF | HTML 13 May 2021
Application note EMI Considerations for Inductive Sensing 22 Feb 2017
Technical article How to use the LDC calculations tool PDF | HTML 10 Nov 2016
Technical article Inductive sensing: target size matters PDF | HTML 16 Nov 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

BOOST-LDC3114EVM — LDC3114 evaluation module for inductive sensing

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 (...)

User guide: PDF | HTML
Not available on TI.com
Evaluation board

LDC-HALL-HMI-EVM — Evaluation module for inductive touch and magnetic dial contactless user-interface design

This evaluation module (EVM) uses inductive and Hall-effect sensing technologies to provide a human-machine interface. The inductive sensing devices create eight different touch buttons on a seamless surface while the Hall-effect sensor is used to create a magnetic dial that can rotate and be used (...)
User guide: PDF | HTML
Not available on TI.com
Firmware

LDC3114-CODE-EXAMPLE — LDC3114 and LDC3114-Q1 C code example

lock = Requires export approval (1 minute)
Supported products & hardware

Supported products & hardware

Products
Inductive sensor AFEs
LDC3114 — 4-channel inductance-to-digital converter for low-power proximity and touch-button sensing LDC3114-Q1 — Automotive 4-channel inductance-to-digital converter for low-power proximity & touch-button sensing
Hardware development
Evaluation board
BOOST-LDC3114EVM — LDC3114 evaluation module for inductive sensing
Download options
Firmware

LDC3114-MSPM0L1306-CODE-EXAMPLE — Example code for the BOOST-LDC3114EVM connected to the LP-MSPM0L1306

Example code for using the BOOST-LDC3114EVM with the LP-MSPM0L1306
lock = Requires export approval (1 minute)
Supported products & hardware

Supported products & hardware

Products
Inductive sensor AFEs
LDC3114 — 4-channel inductance-to-digital converter for low-power proximity and touch-button sensing LDC3114-Q1 — Automotive 4-channel inductance-to-digital converter for low-power proximity & touch-button sensing
Arm Cortex-M0+ MCUs
MSPM0L1306 — 32-MHz Arm® Cortex®-M0+ MCU with 64-KB flash, 4-KB SRAM, 12-bit ADC, comparator, OPA MSPM0L1306-Q1 — Automotive 32-Mhz Arm® Cortex®-M0+ with 64-KB flash, 4-KB RAM, 12-bit ADC, OPA,LIN
Hardware development
Evaluation board
BOOST-LDC3114EVM — LDC3114 evaluation module for inductive sensing LP-MSPM0L1306 — MSPM0L1306 LaunchPad™ development kit for 32-MHz Arm® Cortex®-M0+ MCU
Download options
Simulation model

LDC3114 in Raw Data Mode PSpice Model

SNOM776.ZIP (605 KB) - PSpice Model
Download
Calculation tool

LDC-CALCULATOR-TOOLS — Inductive Sensing Design Calculator Tool

The inductive sensing calculator tools provide two Excel spreadsheets to assist in the design process for inductive-to-digital converter (LDC) devices. These tools provide coil design assistance as well as some device-specific configurations.

Supported products & hardware

Supported products & hardware

Products
Inductive sensor AFEs
LDC0851 — Differential inductive switch for MCU-less applications LDC1041 — 1-Ch, 5V, 24-bit L, 8-bit Rp, inductance to digital converter LDC1051 — 1-Ch, 5V, 8-bit Rp, inductance to digital converter LDC1101 — 1-Ch, 1.8V, 24-bit L, 16-bit Rp, inductance to digital converter for high speed applications LDC1312 — 2-Ch, 12-bit, general purpose inductance to digital converter LDC1312-Q1 — 2-Ch, 12-bit, general purpose automotive inductance to digital converter LDC1314 — 4-Ch, 12-bit, general purpose inductance to digital converter LDC1314-Q1 — 4-Ch, 12-bit, general purpose automotive inductance to digital converter LDC1612 — 2-Ch, 28-bit, high-resolution Inductance to digital converter LDC1612-Q1 — 2-Ch, 28-bit, high-resolution automotive inductance to digital converter LDC1614 — 4-Ch, 28-bit, high-resolution Inductance to digital converter LDC1614-Q1 — 4-Ch, 28-bit, high-resolution automotive inductance to digital converter LDC2112 — 2-Ch inductance to digital converter with baseline tracking for low power touch buttons LDC2114 — 4-Ch inductance to digital converter with baseline tracking for low power touch buttons LDC3114 — 4-channel inductance-to-digital converter for low-power proximity and touch-button sensing LDC3114-Q1 — Automotive 4-channel inductance-to-digital converter for low-power proximity & touch-button sensing
Hardware development
Evaluation board
LDC0851EVM — LDC0851EVM - High Accuracy Inductive Switch with Stacked Coils Evaluation Module LDC1614EVM — LDC1614 Evaluation Module for Inductance to Digital Converter with Sample PCB Coils
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Package Pins Download
TSSOP (PW) 16 View options
TI's Standard Terms and Conditions for Evaluation Items apply.

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