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


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Key Document


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


TI Devices (1)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
MSP430FR2633  MSP430 MCU with CapTIvate technology - the lowest power, most noise-immune capacitive touch  MSP430 Ultra-Low-Power MCUs  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents
User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 2173 06 Oct 2015 47
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 112 10 Nov 2015 10
ZIP 370 10 Nov 2015 12
PDF 1133 10 Nov 2015 9
PDF 160 10 Nov 2015 10
PDF 141 10 Nov 2015 29
Related Tools & Software

Reference Designs (1)

Name Part Number Tool Type
Thermostat Implementation with MSP430 Microcontroller Reference Design  TIDM-FRAM-THERMOSTAT  TI Designs

Design Kits & Evaluation Modules (1)

Name Part Number Tool Type
MSP CapTIvate MCU Development Kit  MSP-CAPT-FR2633  Evaluation Modules & Boards 

Software (2)

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

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