TIDA-00460

Inductive Linear Position Sensing Booster Pack Reference Design

TIDA-00460

Design files

Overview

Typical implementations of distance measurements use expensive rare-earth magnets. To lower overall system cost, this reference design walks through the implementation of industry’s first inductance-to-digital converters from TI for linear position sensing without the use of any expensive rare-earth magnets. Linear position sensing determines the position of a target that moves laterally across an inductive sensor that is generating a magnetic field. An inductance-to-digital converter (LDC), like the LDC1000 or LDC1101, senses inductance changes of an inductor that comes into proximity with a conductive target, such as a piece of metal. The LDC measures this inductance shift to provide information about the position of a conductive target over a sensor coil. The inductance shift is caused by eddy currents generated in the target due to the magnetic field of the sensor. These eddy currents generate a secondary magnetic field that opposes the sensor field, causing a shift in the observed inductance.

Features
  • Inductive sensing technology
  • Non-contact detection and measurement
  • Increased flexibility and performance without requiring analog trimming techniques
  • Remote sensor placement
  • Insensitive to environmental contaminations
  • More reliable operation sensor self-diagnostic
  • High resolution and accurate
  • Replace legacy analog only solutions
  • Low power, low cost and low footprint solution

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDRFB7.PDF (618 K)

Detailed schematic diagram for design layout and components

TIDRFB8.PDF (192 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRFC1.PDF (189 K)

Detailed overview of design layout for component placement

TIDRFC0.ZIP (3417 K)

Files used for 3D models or 2D drawings of IC components

TIDCAH3.ZIP (367 K)

Design file that contains information on physical board layer of design PCB

TIDRFB9.PDF (1097 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Inductive sensor AFEs

LDC11011-Ch, 1.8V, 24-bit L, 16-bit Rp, inductance to digital converter for high speed applications

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

LP5951150-mA, low-IQ, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
MSP430 microcontrollers

MSP430F552825 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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* User guide Inductive Linear Position Sensing Booster Pack Design Guide (Rev. A) Jun. 29, 2015

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