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LDC1314

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4-Ch, 12-bit, general purpose inductance to digital converter

Data sheet
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4-Ch, 12-bit, general purpose inductance to digital converter

LDC1314

ACTIVE
Data sheet Order now

Product details

Parameters

Features Raw code digital output Operating temperature range (C) -40 to 125 Vs (Min) (V) 2.7 Vs (Max) (V) 3.6 Resolution (Bits) 12 Rating Catalog open-in-new Find other Signal conditioners

Package | Pins | Size

WQFN (RGH) 16 16 mm² 4 x 4 open-in-new Find other Signal conditioners

Features

  • Easy-to-Use – Minimal Configuration Required
  • Up to 4 Channels With Matched Sensor Drive
  • Multiple Channels Support Environmental and Aging Compensation
  • Remote Sensor Position of >20 cm Supports Operation In Harsh Environments
  • Pin-Compatible Medium and High-Resolution Options:
    • LDC1312/4: 2/4-ch 12-Bit LDC
    • LDC1612/4: 2/4-ch 28-Bit LDC
  • Supports Wide Sensor Frequency Range of 1 kHz to 10 MHz
  • Power Consumption:
    • 35 µA Low Power Sleep Mode
    • 200 nA Shutdown Mode
  • 2.7 V to 3.6 V Operation
  • Multiple Reference Clocking Options:
    • Included Internal Clock For Lower System Cost
    • Support for 40 MHz External Clock For Higher System performance
  • Immunity to DC Magnetic Fields and Magnets

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Description

The LDC1312 and LDC1314 are 2- and 4-channel, 12-bit inductance to digital converters (LDCs) for inductive sensing solutions. With multiple channels and support for remote sensing, the LDC1312 and LDC1314 enable the performance and reliability benefits of inductive sensing to be realized at minimal cost and power. The products are easy to use, only requiring that the sensor frequency be within 1 kHz and 10 MHz to begin sensing. The wide 1 kHz to 10 MHz sensor frequency range also enables use of very small PCB coils, further reducing sensing solution cost and size.

The LDC1312 and LDC1314 offer well-matched channels, which allow for differential and ratiometric measurements. This enables designers to use one channel to compensate their sensing for environmental and aging conditions such as temperature, humidity, and mechanical drift. Given their ease of use, low power, and low system cost these products enable designers to greatly improve on existing sensing solutions and to introduce brand new sensing capabilities to products in all markets, especially consumer and industrial applications. Inductive sensing offers better performance, reliability, and flexibility than competitive sensing technologies at lower system cost and power.

The LDC1312 and LDC1314 are easily configured via an I2C interface. The two-channel LDC1312 is available in a WSON-12 package and the four-channel LDC1314 is available in a WQFN-16 package.

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Technical documentation

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Type Title Date
* Datasheet LDC1312, LDC1314 Multi-Channel 12-Bit Inductance to Digital Converter (LDC) for Inductive Sensing datasheet (Rev. A) May 25, 2018
Application notes Common Inductive and Capacitive Sensing Applications (Rev. A) Mar. 30, 2020
Application notes Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) Mar. 25, 2020
Application notes Configuring Inductive-to-Digital-Converters for Parallel Resistance (RP) Variati (Rev. B) Nov. 11, 2019
Application notes LDC Device Selection Guide (Rev. C) Nov. 11, 2019
Application notes LDC Sensor Design (Rev. B) Nov. 08, 2019
Application notes LDC1xxx LDC Target Design (Rev. A) May 09, 2017
Application notes EMI Considerations for Inductive Sensing Feb. 22, 2017
Application notes LDC1312, LDC1314, LDC1612, LDC1614 Sensor Status Monitoring Oct. 09, 2016
User guides LDC131x and LDC161x EVM User’s Guide (Rev. A) Sep. 21, 2016
Application notes Setting LDC1312/4, LDC1612/4, and LDC1101 Sensor Drive Configuration Apr. 05, 2016
Application notes Inductive Sensing Touch-On-Metal Buttons Design Guide Mar. 30, 2016
Technical articles Inductive sensing: setting the sensor current-drive without a fancy impedance analyzer Mar. 24, 2016
Application notes Power Reduction Techniques for the LDC131x/161x for Inductive Sensing Mar. 18, 2016
Application notes Optimizing L Measurement Resolution for the LDC1312 and LDC1314 Feb. 12, 2016
Technical articles SigCon Architect: The keys to your high-speed design Oct. 27, 2015
Application notes Measuring Rp of an L-C Sensor for Inductive Sensing Oct. 01, 2015
Technical articles Inductive sensing: How to design an inductive sensor with the new WEBENCH Coil Designer Aug. 19, 2015
Technical articles Inductive sensing: How to sense spring compression Jul. 13, 2015
User guides LDC Reference Coils User’s Guide May 14, 2015

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$199.00
Description

The LDC1314DIAL evaluation module implements a contactless rotational position sensing solution that is accurate to 1 degree with 0.1 degree resolution.

This design uses the LDC1314 but can also be replicated with the LDC1312, LDC1612 and LDC1614.

Evaluation steps

Step 1: Purchase the LDC1314DIAL-EVM
Step 2 (...)

Features
  • Absolute angle sensing with 1 degree accuracy with 0.1 degree resolution
  • No magnets used and not affected by DC magnetic fields
  • Maximum speed of 200 RPM
View details
EVALUATION BOARDS Download
document-generic User guide
$99.00
Description
The LDC1314 evaluation module demonstrates inductive sensing technology for sensing and measuring the presence of a conductive target. The evaluation module includes two example PCB sensor coils that connect to the four channels of the LDC1314, and an MSP430 microcontroller is used to interface the (...)
Features
  • Multiple board perforations provide maximum evaluation and system design flexibility
  • Includes example sensor coils for the different channels
  • Accompanying GUI for quick concept demonstration and data capture
  • EVM does not require additional components for operation, enabling rapid device evaluation
View details
EVALUATION BOARDS Download
document-generic User guide
$199.00
Description

The LDC1314KEYPAD evaluation module implements a 16 snap dome button keypad using only one LDC1314 to multiplex all 16 buttons.

This design uses the LDC1314 but can also be replicated with the LDC1312, LDC1612 and LDC1614.

Evaluation steps

Step 1: Purchase the LDC1314KEYPAD-EVM
Step 2: Download the  (...)

Features
  • Contactless buttons, with superior reliability over electrical/mechanical contact solutions
  • Can be easily used to implement ruggedized, environmentally sealed keypad and keyboard solutions for harsh environments
  • Supports simultaneous button presses
  • Temperature stable
  • Easily scalable to larger key arrays (...)
View details
EVALUATION BOARDS Download
document-generic User guide
$29.00
Description

The LDCCOILEVM is designed to provide maximum flexibility for system prototyping and allow for experimentation with different coil sizes. It includes 19 unique types of PCB coils that range from long rectangular asymmetric coils to small circular coils 3mm in diameter. Every coil is separated by (...)

Features
  • 19 different types of coils
  • Perforated edges to separate and use remotely
  • Smaller coils have extra pads for a series inductor
View details

Software development

FIRMWARE Download
SNOC027.ZIP (882 KB)

Design tools & simulation

SIMULATION MODELS Download
SNIM005.ZIP (26 KB) - IBIS Model

Reference designs

REFERENCE DESIGNS Download
Touch on Metal Buttons With Integrated Haptic Feedback Reference Design
TIDA-00314 — This TI Design uses Texas Instruments' inductance-to-digital converter technology to provide a high-precision method to sense button presses on a metal surface and TI's Haptic Drivers provide high quality haptics feedback to the user. TIDA-00314 demonstrates techniques for system design (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
16-button Inductive Keypad Reference Design Using the LDC1314 Inductance-to-Digital Converter
TIDA-00509 — The LDC1314's unique inductive sensing capability is used to implement a contactless, 16 button, multi-function keypad. It uses standard PCB technology and easily manufactured components to implement a low cost solution.

This reference design uses the LDC1314.  This reference design can also be (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC1312/LDC1314
TIDA-00615 — An inductive sensing based incremental encoder knob design can provide a robust and low-cost interface for control inputs.  It can reliably operate in environments which have dirt, moisture, or oil which would pose issues for alternate sensing technologies. This solution requires no magnets.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
1-Degree Dial Reference Design Using the LDC1314 Inductance-to-Digital Converter
TIDA-00508 — The LDC1314's unique inductive sensing capability is used to implement a contactless rotational position sensing solution that is accurate to 1 degree. It uses standard PCB technology and easily manufactured components to implement a low cost solution.

This reference design uses the LDC1314.  (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WQFN (RGH) 16 View options

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Training series

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Videos

Anti-tamper Techniques to Thwart Attacks on Smart Meters—Detecting case tamper attacks using inductive switches: TIDA-01377 Case Tamper Detection using Inductive Sensing Reference Design Demo

Watch the TIDA-01377 in action as it detects when someone opens the terminal block case of an electricity meter!  

Posted: 12-Jan-2017
Duration: 07:34

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