The Durable HMI Solution

Texas Instruments' Durable HMI Solution permits the designing of human machine interface panels, otherwise known as Operator Interface Panels, which are immune to mechanical fatigue. The industrial button or slider system offers the flexibility in industrial design of capacitive touch without sacrificing the tactile feedback of a mechanical button, thus ensuring an increase in system functionality, reliability, and product life for a range of industrial or white good applications.

Solution features
The overall solution features a turnkey haptics solution with access to an integrated, royalty-free, Immersion library of over 100 haptic effects. Driving the tactile feedback is an ERM or LRA high efficiency output drive motor with a closed-loop motor control. Also include is the ultra-low-power MSP430 value line mixed signal microcontroller. MSP430 combines cost-effectiveness with programming ease to enable capacitive touch buttons, sliders, and wheels. Lastly, TPA2034D1 provides a 2.75-W high-efficiency filter-free Class-D audio power amplifier that requires a single external component.

The MSP430 family
The MSP430 family of ultra-low-power MCUs consists of 16-bit, RISC-based, mixed-signal processors, with multiple peripheral configurations to support various applications. Five low-power modes, coupled with an optimized architecture, yield an extended battery life in portable measurement applications. A digitally controlled oscillator allows immediate wake-up from low-power mode in less than 1 µs.

TI’s Durable HMI Solution takes advantage of the MSP430G2x53 sub-family includes a 10-bit analog-to-digital converter, 16-bit timers, up to 24 I/O capacitive-touch-enabled pins, a versatile analog comparator, and built-in communication capability using the universal serial communication interface.

DRV2605
The DRV2605 haptic driver is designed specifically for linear resonant actuators (LRA) and eccentric rotating mass (ERM) motors. It integrates a realistic haptic feedback to an array of consumer and industrial products: smartphones, tablets, refrigerators, microwave ovens, and washing machines.

A number of unique features enable DRV2605 to eliminate the design complexities of haptic motor control. The component comes pre-loaded with 123 royalty-free distinct haptic effects designed and licensed by Immersion, removing the need to design separate haptic waveforms. Moreover, a real-time playback mode automatically converts audio in to haptic effects. The host processor can then bypass the library playback engine and play waveforms directly from the host through a shared I2C-compatible bus.

Additionally, DRV2605 features smart loop architecture granting an auto resonant drive for LRA and a feedback-optimized ERM drive. This feedback maximizes the haptic vibration, makes automatic overdriving and braking possible, which in turn creates a reliable motor control, consistent motor performance, reduces braking time by 50% and simplifies software programming.

TPA2034D1
The last component of the solution is the TPA2034D1; a 2.75 W high efficiency filter-free class-D audio power amplifier that’s contained in a 1.5 x 1.5-mm wafer chip scale package, and requires only a single external component. Development is made easy thanks to a combination of a minimal PCB footprint with 75-dB PSRR and improved RF rectification immunity makes the TPA2034D1 idyllic for easy wireless headset and PDA integration.

Purchase these featured parts now at Mouser Electronics:

MSP430G2553
DRV2605YZFT
TPA2034D1