TIDA-00343

Low-Power Touch Through Glass Reference Design

TIDA-00343

Design files

Overview

Human machine interface (HMI) is an essential part of process plants since it is one of the major ways through which humans and machines interact. This reference design offers an HMI solution for harsh and hazardous area applications. In process plants, operators need to interact with an explosion-proof display/controller which is encapsulated in a screw-on metallic enclosure with a thick glass window for local read-out and programming functions.

TIDA-00343 uses MSP430™ microcontrollers (MCU) with CapTIvate™ technology so the operator will be able to interact with the controller without the need of opening the enclosure, which saves time by avoiding work permit or plant shutdown.

Features
  • Four-robust buttons option implemented
  • Variable airgap between buttons and glass (1 mm to 2 mm)
  • Finger detection through 10-mm thick glass
  • Work with gloves and in harsh environment (water, oil, dust and more)
  • Temperature range: -40°C to 85°C
  • Low power(~10-Hz scan rate): 240-µA average
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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.

TIDUBJ7.PDF (2312 K)

Reference design overview and verified performance test data

TIDRKV7.PDF (212 K)

Detailed schematic diagram for design layout and components

TIDRKV8.PDF (51 K)

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

TIDRKV9.PDF (96 K)

Detailed overview of design layout for component placement

TIDRKW1A.ZIP (471 K)

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

TIDCBY1.ZIP (354 K)

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

TIDRKW0.PDF (497 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

MSP430 microcontrollers

MSP430FR2633Capacitive Touch MCU with 16 touch IO (64 sensors), 16KB FRAM, 4KB SRAM, 19 IO, 10-bit ADC

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Low Power Touch Through Glass Design Guide Mar. 07, 2016
Technical article Engineering magic: Touch through thick glass with LEDs and LCD PDF | HTML Aug. 18, 2016
Technical article Engineers do better than magicians: HMI touch through a thick glass PDF | HTML Apr. 26, 2016

Related design resources

Software development

APPLICATION SOFTWARE & FRAMEWORK
MSPCAPTDSNCTR CapTIvate™ Design Center GUI for MSP430™ Capacitive Sensing MCUs

Reference designs

REFERENCE DESIGN
TIDA-00464 High Temperature Touch through Glass Reference Design TIDA-00494 Touch Through Glass with Sharp ® LCD Reference Design

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