TIDA-00509

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

TIDA-00509

Design files

Overview

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 used with LDC1312, LDC1612 and LDC1614.

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

Design files & products

Design files

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

TIDU954A.PDF (1917 K)

Reference design overview and verified performance test data

TIDREP4.PDF (60 K)

Detailed schematic diagram for design layout and components

TIDREP5.PDF (38 K)

Detailed schematic diagram for design layout and components

TIDREP6.PDF (31 K)

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

TIDREP7.PDF (207 K)

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

TIDREP8.PDF (74 K)

Detailed overview of design layout for component placement

TIDREP9.PDF (293 K)

Detailed overview of design layout for component placement

TIDREQ2.ZIP (220 K)

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

TIDREQ3.ZIP (138 K)

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

TIDCA94.ZIP (77 K)

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

TIDCA95.ZIP (109 K)

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

TIDREQ0.PDF (326 K)

PCB layer plot file used for generating PCB design layout

TIDREQ1.PDF (275 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Inductive sensor AFEs

LDC13122-Ch, 12-bit, general purpose inductance to digital converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Inductive sensor AFEs

LDC13144-Ch, 12-bit, general purpose inductance to digital converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Inductive sensor AFEs

LDC16122-Ch, 28-bit, high-resolution Inductance to digital converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Inductive sensor AFEs

LDC16144-Ch, 28-bit, high-resolution Inductance to digital converter

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

LP2985-N150-mA, 16-V, 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

Start development

Hardware

Evaluation board

LDC1314KEYPAD-EVM – LDC1314 Inductance-to-Digital Converter Evaluation Module

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

Software

GUI for evaluation module (EVM)

TIDA-00509 LDC1314 Inductive Keypad GUI and Firmware Installer – TIDCA92.ZIP (6561 K)

Technical documentation

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Type Title Date
* Design guide 16-Button Keypad Using the LDC1314 Inductance-to-Digital Converter Design Guide (Rev. A) Jun. 24, 2016
Technical article Trends in building automation: connected sensors for user comfort Sep. 02, 2016
Technical article Inductive sensing: Improve the ENOB of a multichannel LDC by 4 bits in 3 simple steps Jun. 24, 2015

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