Capacitive Touch Controllers

Featured Software

MSP430™ Capacitive Touch Pro GUI

The MSP430 Touch Pro Tool is a PC-based tool that can be used to verify capacitive touch button, slider,and wheel designs. The tool receives and visualizes captouch sensor data to help the user quickly and easily evaluate, diagnose, and tune button, slider, and wheel designs.

MSP430™ Capacitive Touch Power Designer GUI

The MSP430 Capacitive Touch Power Designer GUI allows designers to estimate power consumption for a given MSP430 capacitive touch system even before laying out a board. By entering system parameters such as operating voltage, frequency, number of buttons, and button gate time, the user can have a power estimate for a given capacitive touch configuration on a given device family in minutes.

Review our Design Resources:

Design Guides

• Capacitive Touch Sensing, MSP430™ Button Gate Time Optimization and Tuning Guide
• Capacitive Touch Sensing, MSP430™ Slider/Wheel Tuning Guide
• Capacitive Touch Sensing, Sensor Design Guide
• Capacitive Touch Sensing, SYS/BIOS
• Getting Started with the MSP430 LaunchPad Workshop
• MSP430 Low Cost PinOsc Capacitive Touch Overview
• MSP430x5xx and MSP430x6xx Family User's Guide (Rev. M)

Software Library

The royalty-free MSP430 Capacitive Touch Sense Software Library gives developers the option to add touch sense capabilities to any MSP430 microcontroller consuming as little as 1KB of program memory. The open-source software library eliminates the need to develop complex touch sensing algorithms and supports various capacitive touch sensors, including buttons, sliders, wheels and proximity.

Reference Designs

• 1-uA Capacitive Grip Detection Based on MSP430 Microcontrollers Appnote
• MSP430 Low Cost PinOsc Capacitive Touch Keypad
• 10cm Proximity detection Appnote
• Wireless Remote Controller With Capacitive Touch Pad Using MSP430F51x2

Capacitive Touch Hardware Development Kits

The Capacitive Touch BoosterPack (430BOOST-CAPTOUCH1) is a plug in board for the MSP430 Value Line LaunchPad development kit (MSP-EXP430G2 - sold separately). The Capacitive Touch BoosterPack ($10) features several capacitive touch elements including a scroll wheel, button and proximity sensor. Also, on-board are 9 LEDs that provide instant feedback as users interact with the capacitive touch elements.

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Capacitive Touch Optimized Microcontrollers

The MSP430 Value Line G2xx2/3 devices include capacitive touch sense IOs, which enable developers to interface directly with capacitive touch pads without external components. The MSP430F51x2 devices include Timer_D, a high-performance timer featuring a 4 nanosecond resolution, enabling high-precision touch sensing.

Device	Flash [KB]	FRAM [KB]	RAM [Bytes]	Capacitive Touch Features		Touch Buttons Supported	Additional Features		Datasheet	Samples
				Touch Sense IO1	Timer_D2		Digital	Analog
MSP430G2x02	1-8		128-256			≤16	USI3		Download	Order
MSP430G2x32	1-8		128-256			≤16	USI	ADC10	Download	Order
MSP430G2x13	1-16		256-512			≤ 24	USCI4	Comp	Download	Order
MSP430G2x52	1-8		256			≤ 16	USCI	Comp, ADC10	Download	Order
MSP430G2x53	1-16		256-512			≤ 24	USCI	Comp, ADC10	Download	Order
MSP430G2x03	2-8		256-512			≤ 24	USCI		Download	Order
MSP430G2x33	2-16		256-512			≤ 24	USCI	Comp, ADC10	Download	Order
MSP430G2xx5 New!	32-56		4096			<=32	USCI	ADC10, Comp	Download	Order
MSP430F51x1	8-32		1024-2048			≤ 29	USCI	Comp	Download	Order
MSP430F51x2	8-32		1024-2048			≤ 29	USCI	Comp, ADC10	Download	Order
MSP430FR58XX/59XX New!		32-64	1024-2048			≤40	eUSCI	ADC12 Comp	Download	Order

¹ Touch Sense IO: each I/O supports pin oscillation enabling low-cost touch sensing with no external components
² Timer_D: high-resolution 4ns timer for high-precision touch sensing
³ USI: serial communication interface supporting SPI and I2C
⁴ USCI: serial communication interface supporting I2C, UART and 2x SPI

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