MSP430FR2676 MSP430™ MCU for Capacitive-Touch Sens

By Texas Instruments 82

MSP430FR2676 MSP430™ MCU for Capacitive-Touch Sens

Texas Instruments' MSP430FR2676 ultra-low-power MSP430 MCUs are designed for capacitive-touch sensing and feature CapTIvate touch technology for buttons, slides, wheels, and proximity applications. The MSP430 MCUs with CapTIvate technology provide an ultra-integrated and autonomous capacitive-touch solution with high reliability and noise immunity at ultra-low power. TI’s capacitive touch technology supports concurrent self-capacitance and mutual-capacitance electrodes on the same design for maximum flexibility. The MSP430 MCUs with CapTIvate technology operate through thick glass, plastic enclosures, metal, and wood with operation in harsh environments including wet, greasy, and dirty environments.

TI capacitive-touch sensing MSP430 MCUs are supported by an extensive hardware and software ecosystem with reference designs and code examples to get the user's design started quickly. Development kits include the MSP-CAPT-FR2633 CapTIvate Technology Development Kit. TI provides free software including the CapTIvate Design Center where users can quickly develop applications with an easy-to-use GUI and MSP430Ware™ software and comprehensive documentation with the CapTIvate Technology Guide.

The MSP430 family of low-power MCUs consist of different sets of peripherals targeted for various applications. The architecture combined with extensive low-power modes is optimized to achieve extended battery life in portable measurement applications. The MCU features a powerful 16-bit RISC CPU, 16-bit registers, and constant generators that contribute to maximum code efficiency. The digitally controlled oscillator (DCO) allows the MCU to wake up from low-power modes to active-mode in less than 10 µs (typical).

  • CapTIvate technology - capacitive-touch:
    • Performance:
      • Fast electrode scanning with four simultaneous scans
      • Proximity sensing
    • Reliability: increased immunity to the power line, RF, and other environmental noise
    • Flexibility: supports multi-touch functionality
    • Low power: wake-on-touch state machine allows electrode scanning while the CPU sleeps
    • Ease-of-use
  • Embedded MCU:
    • 16-bit RISC architecture
    • Clock supports frequencies up to 16 MHz
    • On-chip high-frequency modulation oscillator (MODOSC)
  • General input/output and pin functionality
  • Development tools and software
  • Optimized ultra-low-power modes:
    • Active: 135 µA/MHz (typ.)
    • Standby: <5 µA wake-on-ch with four sensors
    • Shutdown (LPM4.5): 37 nA without SVS
  • Low-power ferroelectric RAM (FRAM)
  • Intelligent digital peripherals
  • Enhanced serial communications with support for pin remap feature
  • High-performance analog
  • Clock system
  • 16 KB ROM library includes CapTIvate touch libraries and driver libraries
  • 64 KB of program FRAM, 512 B of information FRAM, 8 KB of RAM supports up to 16 self-capacitive and 64 mutual-capacitive sensors
  • Packages: 48-pin LQFP (PT), 40-pin VQFN (RHA), and 32-pin VQFN (RHB)
  • Major appliances
  • Intrusion HMI keypads and control panels
  • Electronic smart locks, door keypads, and readers
  • Garage door systems
  • Motorized window blinds
  • Remote controls
  • Personal electronics
  • Wireless speakers and headsets
  • Handheld video game controllers
  • A/V receivers
  • White goods
  • Garden and power tools