Capacitive Touch Thermostat UI with MSP MCUs Featuring CapTIvate Technology Reference Design


Design files


TIDM-CAPTIVATE-THERMOSTAT-UI is a low-power, capacitive touch based, thermostat user interface reference design. It features an on-board MSP430TM MCU CapTIvate™ technology which provides robust capacitive touch measurements with a low-power profile, low response time, and increased noise immunity. The design supports multiple modes of operation, including a battery powered mode and a line powered mode. The battery powered mode operates with an average current consumption of less than 50 µA, allowing for two years of battery life on typical AAA batteries. Line powered mode is optimized for noise immunity at the commercial product level. The design features eight buttons that support both momentary and maintained switch implementations. Each button is accompanied by an LED which can be used to indicate touch or switch state.


• MSP430 CapTIvate™ MCU for capacitive touch sensing
• CapTIvate™ Design Center support enabling real-time customization of response time, sensitivity, and other parameters from a host PC
• Multiple modes of operation, including a battery powered mode for increased battery life and a line powered mode for increased noise immunity
• Less than 50µA average current in battery powered mode, allowing for 2 years of battery life on typical AAA batteries
• Conducted noise immunity at the commercial product level (IEC 61000-4-6 Class A @ 3 Vrms) in line powered mode
• Mutual capacitance technology enables 8 buttons with only MCU 6 pins
• Maintained state and momentary capacitive switch implementations
• Ferroelectric random access memory (FRAM) enables button state and configuration retention through power loss

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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.

TIDUAV1.PDF (2173 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


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


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

TIDRIO6.PDF (1133 K)

PCB layer plot file used for generating PCB design layout


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

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Support software


Technical documentation

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* Design guide Capacitive Touch Thermostat User Interface Design Guide Oct. 06, 2015
Technical article Trends in building automation: connected sensors for user comfort PDF | HTML Sep. 02, 2016

Related design resources

Software development

MSPCAPTDSNCTR CapTIvate™ Design Center GUI for MSP430™ Capacitive Sensing MCUs

Reference designs

TIDM-FRAM-THERMOSTAT Thermostat Implementation with MSP430 Microcontroller Reference Design

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