Expanding TI’s 16-bit ultra-low-power FRAM (ferroelectric memory) MCU portfolio, the MSP430FR2633 MCU with CapTIvate technology enables designers “of all skill levels” to build robust human-machine interfaces (HMI) with capacitive buttons, sliders, wheels or proximity (BSWP) sensors. It also enables multi-touch designs with plastic, glass and metal overlays of various thicknesses. Designers can quickly create solutions with the CapTIvate Design Centre, a graphical user interface (GUI) that allows developers to drag and drop sensors for quick system configuration and start tuning for performance in five minutes or less.
Wake-on-touch hardware on chip can continuously scan up to four electrodes while the CPU is shut down, enabling up to 15 years of operation on a single coin cell battery with current consumption of 0.9 µA per button in sleep mode. These ultra-low-power MCUs with Ferroelectric Random Access Memory (FRAM) feature non-volatile memory with greater endurance and 100 times faster write speeds, enabling systems to wake from the lowest power standby modes in a fraction of the time. FRAM also provides the option of saving and restoring button state in the event of power failure without the use of space-consuming backup batteries.
MSP430FR2633 MCUs with CapTIvate offer developers a great deal of design flexibility without compromises, TI adds. In an access control system, a proximity sensor may be needed to illuminate the screen and a large matrix of buttons to support user input. Self-capacitance provides higher sensitivity for proximity sensing, while mutual-capacitance allows for a large number of tightly packed buttons with lower crosstalk. CapTIvate technology provides flexibility to simultaneously support self-capacitance and mutual capacitance for an enhanced system solution. The MSP430FR2633 MCU can support 16 button self-capacitance and 64 button mutual-capacitance modes.
CapTIvate provides hardware features such as a dedicated voltage regulator, frequency hopping, zero crossing synchronisation and signal processing algorithms that prevent false detects in noisy environments. Spread spectrum clocking lowers electromagnetic radiation, reducing emissions to system circuitry.