LDC2114

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

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Product details

Parameters

Applications Inductive touch buttons Number of input channels 4 Vs (Max) (V) 1.89 Vs (Min) (V) 1.71 Operating temperature range (C) -40 to 85 open-in-new Find other Inductive sensor AFEs

Package | Pins | Size

DSBGA (YFD) 16 5 mm² 1.635 x 1.635 TSSOP (PW) 16 22 mm² 5 x 4.4 open-in-new Find other Inductive sensor AFEs

Features

  • 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

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Description

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.

open-in-new Find other Inductive sensor AFEs
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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LDC2112, LDC2114 Inductive Touch Solution for Low-Power HMI Button Applications datasheet (Rev. B) Apr. 04, 2017
Application note Common Inductive and Capacitive Sensing Applications (Rev. A) Mar. 30, 2020
Application note Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) Mar. 25, 2020
Application note Inductive Touch - Configuring LDC2114 Touch-Button Sensitivity (Rev. A) Feb. 17, 2020
Application note LDC Device Selection Guide (Rev. C) Nov. 11, 2019
Application note LDC Sensor Design (Rev. B) Nov. 08, 2019
Technical articles Selecting an airtight approach to water and dust proof buttons Jul. 19, 2018
Application note LDC2112, LDC2114 Internal Algorithms Functionality Jun. 22, 2018
Application note Resonance-Based Capacitive Sensing Using LDC2114 Sep. 20, 2017
User guide Inductive Touch Coil EVM (INx+COM) (Rev. A) Jul. 28, 2017
Application note LDC1xxx LDC Target Design (Rev. A) May 09, 2017
Application note Inductive Touch Buttons for Wearables Feb. 28, 2017
Application note EMI Considerations for Inductive Sensing Feb. 22, 2017
Application note LDC2112/LDC2114 Inductive Touch System Design Guide Feb. 02, 2017
Application note Inductive Touch Buttons for HMIs Jan. 09, 2017
User guide LDC2114 Evaluation Module for Inductive Touch Inductance to Digital Converter Dec. 14, 2016
Application note Measuring Rp of an L-C Sensor for Inductive Sensing Oct. 01, 2015

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
Description

The LDC2114 Evaluation Module for inductive touch applications demonstrates using inductive sensing for button-press detection on a monolithic piece of metal. The LDC2114EVM does not include any example sensors or PCB coils but is capable of connecting up to 4 buttons using the LDCTOUCHCOMCOILEVM (...)

Features
  • <7µA at 0.625 samples per second
  • Up to 4 buttons supported
  • Dedicated button logic outputs
  • Integrated and configurable algorithms for button press detection
  • Includes WM11299-ND-cable and ZIF connector for LDCTOUCHCOMCOILEVM
  • PCB perforations allow for removal of the included MSP430 microcontroller so that a (...)
EVALUATION BOARD Download
document-generic User guide
55
Description
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 (...)
Features
  • 5 sets of 4 coils with different sizes for prototyping
  • Integrated spacer for easy attachment to button surface
  • Simple to use connectors from sensor coil board to device board

Software development

GUI FOR EVALUATION MODULE (EVM) Download
SNOC028F.ZIP (61513 KB)

Design tools & simulation

SIMULATION MODEL Download
SNOM611.ZIP (26 KB) - IBIS Model
CALCULATION TOOL Download
SLYC137E.ZIP (3713 KB)

CAD/CAE symbols

Package Pins Download
DSBGA (YFD) 16 View options
TSSOP (PW) 16 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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