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LDC2112

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2-Ch inductance to digital converter with baseline tracking for low power touch buttons

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Data sheet

LDC2112

ACTIVE
Data sheet Order now

Product details

Applications Inductive touch buttons Number of input channels 2 Rating Catalog Vs (max) (V) 1.89 Vs (min) (V) 1.71 Operating temperature range (°C) -40 to 85
Applications Inductive touch buttons Number of input channels 2 Rating Catalog Vs (max) (V) 1.89 Vs (min) (V) 1.71 Operating temperature range (°C) -40 to 85
DSBGA (YFD) 16 3.24 mm² (0 mm × 0 mm) TSSOP (PW) 16 32 mm² (5 mm × 6.4 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
  • 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

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.

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.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LDC2112, LDC2114 Inductive Touch Solution for Low-Power HMI Button Applications datasheet (Rev. B) PDF | HTML Apr 4, 2017
Application note Inductive Touch System Design Guide for HMI Button Applications (Rev. A) PDF | HTML Feb 13, 2023
Application note Design Considerations for Inductive Touch Buttons for Human-to-Machine Interface (Rev. B) PDF | HTML Apr 12, 2022
Application note Inductive Touch – Configuring LDC2114 and LDC3114 Touch-Button Sensitivity (Rev. B) PDF | HTML Jul 28, 2021
Application note LDC211x and LDC3114 Internal Algorithm Functionality (Rev. A) PDF | HTML Jul 1, 2021
Application note Common Inductive and Capacitive Sensing Applications (Rev. B) PDF | HTML Jun 22, 2021
Application brief Inductive Touch Buttons for Wearables (Rev. A) PDF | HTML Jun 22, 2021
Application note Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) (Rev. A) PDF | HTML Jun 16, 2021
Application note LDC Device Selection Guide (Rev. D) PDF | HTML Jun 15, 2021
Application note Sensor Design for Inductive Sensing Applications Using LDC (Rev. C) PDF | HTML May 21, 2021
Application note LDC Target Design (Rev. B) PDF | HTML May 13, 2021
Application note EMI Considerations for Inductive Sensing Feb 22, 2017
User guide LDC2114 Evaluation Module for Inductive Touch Inductance to Digital Converter Dec 14, 2016
Technical article How to use the LDC calculations tool PDF | HTML Nov 10, 2016
Technical article Inductive sensing: target size matters PDF | HTML Nov 16, 2015
Application note Measuring Rp of an L-C Sensor for Inductive Sensing Oct 1, 2015
Technical article Inductive sensing: Meet the new multichannel LDCs PDF | HTML Apr 27, 2015

Design & development

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

Evaluation board

LDC2114EVM — LDC2114 1.8V 4-Channel Inductive Touch Evaluation Module

The LDC2114EVM (Evaluation Module) demonstrates the use of inductive sensing to detect a button press on a monolithic piece of metal. The EVM can connect up to 4 buttons using the LDCTOUCHCOMCOILEVM or customized coils designed through Webench. Button presses & levels of pressure are indicated (...)
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Evaluation board

LDCTOUCHCOMCOILEVM — Inductive Touch Sensor Coil Evaluation Board

The LDCTOUCHCOMCOILEVM is designed to provide maximum flexibility for system prototyping in inductive touch applications and allows experimentation with different coil sizes.  It includes 5 sets of different sized PCB coils with integrated spacers & perforations such that the coils can be (...)
User guide: PDF
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GUI for evaluation module (EVM)

SNOC028 — Sensing Solutions EVM GUI Tool v1.10.0

Supported products & hardware
Simulation model

LDC2112 IBIS Model

SNOM612.ZIP (27 KB) - IBIS model
Supported products & hardware
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
Package Pins CAD symbols, footprints & 3D models
DSBGA (YFD) 16 Ultra Librarian
TSSOP (PW) 16 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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