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

Industrial

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Design files & products

Design files

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

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Design guide — TIDA-00509

TIDU954A.PDF (1917 K)

Reference design overview and verified performance test data

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Schematic — TIDA-00509

TIDREP4.PDF (60 K)

Detailed schematic diagram for design layout and components

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Schematic — TIDA-00509

TIDREP5.PDF (38 K)

Detailed schematic diagram for design layout and components

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Bill of materials (BOM) — TIDA-00509

TIDREP6.PDF (31 K)

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

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Bill of materials (BOM) — TIDA-00509

TIDREP7.PDF (207 K)

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

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Assembly drawing — TIDA-00509

TIDREP8.PDF (74 K)

Detailed overview of design layout for component placement

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Assembly drawing — TIDA-00509

TIDREP9.PDF (293 K)

Detailed overview of design layout for component placement

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CAD/CAE symbol — TIDA-00509

TIDREQ2.ZIP (220 K)

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

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CAD/CAE symbol — TIDA-00509

TIDREQ3.ZIP (138 K)

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

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Gerber file — TIDA-00509

TIDCA94.ZIP (77 K)

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

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Gerber file — TIDA-00509

TIDCA95.ZIP (109 K)

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

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PCB layout — TIDA-00509

TIDREQ0.PDF (326 K)

PCB layer plot file used for generating PCB design layout

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PCB layout — TIDA-00509

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

LDC1312 — 2-Ch, 12-bit, general purpose inductance to digital converter

Data sheet: PDF | HTML

Inductive sensor AFEs

LDC1314 — 4-Ch, 12-bit, general purpose inductance to digital converter

Data sheet: PDF | HTML

Inductive sensor AFEs

LDC1612 — 2-Ch, 28-bit, high-resolution Inductance to digital converter

Data sheet: PDF | HTML

Inductive sensor AFEs

LDC1614 — 4-Ch, 28-bit, high-resolution Inductance to digital converter

Data sheet: PDF | HTML

Linear & low-dropout (LDO) regulators

LP2985-N — 150-mA, 16-V, low-dropout voltage regulator with enable

Data sheet: PDF | HTML

MSP430 microcontrollers

MSP430F5528 — 25 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier

Data sheet: PDF | 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.

Not available on TI.com

TI’s Standard Terms and Conditions for Evaluation Items apply.

Software

GUI for evaluation module (EVM)

TIDCA92 — TIDA-00509 LDC1314 Inductive Keypad GUI and Firmware Installer

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Supported products & hardware

Products

Inductive sensor AFEs

LDC1314 — 4-Ch, 12-bit, general purpose inductance to digital converter

Hardware development

Evaluation board

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

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TIDCA92 — TIDA-00509 LDC1314 Inductive Keypad GUI and Firmware Installer

Latest version

Version: 01.00.00.00

Release date: 23 Apr 2015

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TIDA-00509 LDC1314 Inductive Keypad GUI and Firmware Installer (zip) — 6561 K

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= Requires export approval (1 minute)

Products

Inductive sensor AFEs

LDC1314 — 4-Ch, 12-bit, general purpose inductance to digital converter

Hardware development

Evaluation board

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

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	PDF \| HTML	Sep. 02, 2016
	Technical article	Inductive sensing: Improve the ENOB of a multichannel LDC by 4 bits in 3 simple st	PDF \| HTML	Jun. 24, 2015

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