Low Power Capacitive Touch Solution Human Machine Interface (HMI) Apps Reference Design


Design files


This reference design demonstrates an ultra-low power implementation of capacitive-touch inputs for various human machine interface (HMI) requirements in consumer, industrial and other applications. This deisgn leverages unique features available in the MSP430 value-line microcontroller that enables you to interface capacitive-touch elements directly to a microcontroller input/output pin without the need for external or additional passive components. The capacitive touch BoosterPack features several capacitive touch elements including a scroll wheel, button and proximity sensors. When paired with the MSP430 LaunchPad, this combination provides a hardware and software reference design to enable you to quickly and easily replace any physical button with a capacitive-touch element. This combination provides cost effectiveness for adding capacitive touch to consumer electronics, point-of-sales machines and devices that have a physical button.

  • Capacitive touch elements:
    • Scroll wheel
    • Button
    • Proximity sensor
  • Nine on-board LEDs for instant feedback
  • Timer-based UART communication enables interface to PC
  • Open-source GUI
  • Fully supported by the MSP430 capacitive touch sense library

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.

TIDR679.PDF (130 K)

Detailed schematic diagram for design layout and components

TIDR680.PDF (42 K)

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

TIDC452.ZIP (156 K)

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


Includes TI products in the design and potential alternatives.

ESD & surge protection ICs

TPD2E001Dual 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

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

TPS773250-mA, 10-V, low-dropout voltage regulator with RESET with delay

Data sheet document-pdfAcrobat PDF
MSP430 microcontrollers

MSP430G245216 MHz MCU with 8KB Flash, 256B SRAM, 10-bit ADC, comparator, timer, SPI/I2C

Data sheet document-pdfAcrobat PDF
MSP430 microcontrollers

MSP430G255316 MHz MCU with 16KB Flash, 512B SRAM, comparator, UART/SPI/I2C, timer

Data sheet document-pdfAcrobat PDF
USB hubs & controllers

TUSB3410UART, I2C & IrDA serial port to USB bridge

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

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