Liquid Tolerant Capacitive Touch Keypad Reference Design
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Key Document


The Liquid Tolerant Capacitive Touch Keypad Design (TIDM-1021) is a reference design for implementing liquid tolerant capacitive touch human-machine interfaces (HMIs).  It integrates TI's MSP430FR2633 microcontroller (MCU) featuring high performance CapTIvate™ touch technology with an optimized sensor layout design and software.  This reference design demonstrates how to design capacitive touch hardware and software that can work reliably under liquid influence and pass challenging tests for conductive noise immunity.

  • MSP430™ CapTIvate  MCU for Liquid-Tolerant Capacitive-Touch Sensing
  • Advanced Human Machine Interface Design with 12-Button Keypad
  • 12 LEDs Driven by MSP430  CapTIvate MCU for Backlighting
  • Passes IEC 61000-4-6 Conducted Noise Immunity Test at 3 Vrms Stress Level
  • No False Touch Detection and Accurately Detect Touched Button under IPX5 Rating Test with AC Power

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Schematic/Block Diagram

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
MSP430FR2533  16 MHz Ultra-Low-Power Microcontroller with 16 KB FRAM, CapTIvate touch technology  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules
MSP430FR2633  MSP430 MCU with CapTIvate technology - the lowest power, most noise-immune capacitive touch  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
MSP430FR2533 Download -
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MSP430FR2633 Download -
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Technical Documents

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Datasheet (1)
Title Type Size (KB) Date
PDF 4110 09 Dec 2019
User guides (2)
Title Type Size (KB) Date
17 Jan 2018
PDF 2273 31 Jul 2018
Design files (6)
Title Type Size (KB) Date
ZIP 452 31 Jul 2018
ZIP 433 31 Jul 2018
PDF 829 31 Jul 2018
PDF 104 31 Jul 2018
PDF 227 31 Jul 2018
PDF 130 31 Jul 2018
Related Tools & Software

Reference Designs  ( 1 )

Name Part Number Tool Type
Noise Tolerant Capacitive Touch HMI Reference Design  TIDM-CAPTOUCHEMCREF  TI Designs

Software (2)

Name Part Number Software Type
CapTIvate™ Design Center GUI for MSP430™ Capacitive Sensing MCUs  MSPCAPTDSNCTR  Software Libraries 

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