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LDC1314

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

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Data sheet

LDC1314

ACTIVE
Data sheet Order now

Product details

Applications Inductive touch buttons, Encoders/event counters, Metal proximity detection Number of input channels 4 Vs (Max) (V) 3.6 Vs (Min) (V) 2.7 Operating temperature range (C) -40 to 125
Applications Inductive touch buttons, Encoders/event counters, Metal proximity detection Number of input channels 4 Vs (Max) (V) 3.6 Vs (Min) (V) 2.7 Operating temperature range (C) -40 to 125
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WQFN (RGH) 16 16 mm² 4 x 4
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  • 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
  • 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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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.

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
* Data sheet LDC1312, LDC1314 Multi-Channel 12-Bit Inductance to Digital Converter (LDC) for Inductive Sensing datasheet (Rev. A) 25 May 2018
Application note Common Inductive and Capacitive Sensing Applications (Rev. B) 22 Jun 2021
Application note Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) (Rev. A) 16 Jun 2021
Application note LDC Device Selection Guide (Rev. D) 15 Jun 2021
Application note Sensor Design for Inductive Sensing Applications Using LDC (Rev. C) 21 May 2021
Application note LDC Target Design (Rev. B) 13 May 2021
Application note Configuring Inductive-to-Digital-Converters for Parallel Resistance (RP) Variati (Rev. B) 11 Nov 2019
Application note EMI Considerations for Inductive Sensing 22 Feb 2017
Technical article How to use the LDC calculations tool 10 Nov 2016
Application note LDC1312, LDC1314, LDC1612, LDC1614 Sensor Status Monitoring 09 Oct 2016
User guide LDC131x and LDC161x EVM User’s Guide (Rev. A) 21 Sep 2016
Application note Setting LDC1312/4, LDC1612/4, and LDC1101 Sensor Drive Configuration 05 Apr 2016
Application note Inductive Sensing Touch-On-Metal Buttons Design Guide 30 Mar 2016
Technical article Inductive sensing: setting the sensor current-drive without a fancy impedance analyzer 24 Mar 2016
Application note Power Reduction Techniques for the LDC131x/161x for Inductive Sensing 18 Mar 2016
Application note Optimizing L Measurement Resolution for the LDC1312 and LDC1314 12 Feb 2016
Technical article Inductive sensing: target size matters 16 Nov 2015
Application note Measuring Rp of an L-C Sensor for Inductive Sensing 01 Oct 2015
Technical article Inductive sensing: How to design an inductive sensor with the new WEBENCH Coil Designer 19 Aug 2015
User guide LDC Reference Coils User’s Guide 14 May 2015

Design & development

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

Evaluation board

LDC1314DIAL-EVM — LDC1314 inductance-to-digital converter evaluation module: 1-degree dial

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.

In stock
Limit: 5
Evaluation board

LDC1314EVM — LDC1314 Evaluation Module for Inductance to Digital Converter with Sample PCB Coils

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 (...)
document-pdfAcrobat User guide
In stock
Limit: 5
Evaluation board

LDC1314KEYPAD-EVM — LDC1314 inductance-to-digital converter evaluation module: 16 button keypad

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.

In stock
Limit: 5
Evaluation board

LDCCOILEVM — Reference Coil Board Evaluation Module

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 (...)

document-pdfAcrobat User guide
In stock
Limit: 5
Firmware

MSP430 Firmware Source Code for Multichannel LDC

SNOC027.ZIP (882 KB)
Download
GUI for evaluation module (EVM)

Sensing Solutions EVM GUI Tool v1.10.0 (Rev. F)

SNOC028F.ZIP (61513 KB)
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Simulation model

LDC1314 IBIS MODEL

SNIM005.ZIP (26 KB) - IBIS Model
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Calculation tool

Inductive Sensing Design Calculator Tool (Rev. G)

SLYC137G.ZIP (3737 KB)
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Reference designs

TIDA-00615 — Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC1312/LDC1314

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-pdfAcrobat Schematic
Reference designs

TIDA-00314 — Touch on Metal Buttons With Integrated Haptic Feedback Reference Design

This reference design uses our inductance-to-digital converter technology to provide a high-precision method to sense button presses on a metal surface and our haptic drivers provide high-quality haptics feedback to the user. TIDA-00314 demonstrates techniques for system design, environmental (...)
document-pdfAcrobat Schematic
Reference designs

TIDA-00509 — 16-button Inductive Keypad Reference Design Using the LDC1314 Inductance-to-Digital Converter

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-pdfAcrobat Schematic
Reference designs

TIDA-00508 — 1-Degree Dial Reference Design Using the LDC1314 Inductance-to-Digital Converter

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-pdfAcrobat Schematic
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WQFN (RGH) 16 View options

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