Tactile feedback solutions using piezoelectric actuators


Posted on Feb 6, 2014

Implementing tactile (haptic) feedback in consumer-electronic devices enhances the user ’s experience. It provides a sense of touch in a user-interface design and is the newest major interface on smartphones and other portable consumer-electronic devices. Several haptic technologies are available now, including but not limited to vibration motor actuation, piezoelectric actuation,


Tactile feedback solutions using piezoelectric actuators
Click here to download the full size of the above Circuit.

and electro-active polymer actuation. This article explains the basics of piezoelectric-based actuation and how it offers a fast response time, thin profile, and low power, all of which are important in handheld applications. The information from Table 1 suggests using single-layer piezo actuators. They are more available and already in production volumes; multilayer piezos, while in production, are less available. Also, a single-layer piezo costs much less, a factor that becomes more important in solutions with more than one piezo. For example, several smartphones on the market have multiple single-layer discs mounted behind the display. A similar multilayer piezo solution would cost considerably more. One of the drawbacks of piezo-based haptics has traditionally been the complexity of the solution. Typical piezo-based solutions have used discrete components to implement the complete tactile feedback system; the extra discrete components included a microcontroller, flyback boost or charge-pump integrated circuit, flyback transformer or inductor, miscellaneous resistors, capacitors, diodes, and transistors. Compare that with DC-motor-based haptics which require few or no external components. A single-chip monolithic haptic solution such as the MAX11835 has several advantages over the older, discrete designs: smaller printed circuit board (PCB) footprint, lower power, lower bill-of-materials (BOM) cost, and simple software...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Ultrasound Detector with 567PLL and LM386 ICs
    Audio isolation transformer
    Lvdt-driver-demodulator
    High Input Voltage Linear Regulator
    Snow Depth Measurement Sensor
    Programming the AVR Microcontroller with GCC
    Allarm antifurto
    Glowing Hybrid Amp
    Fundamentals of Electrical Engineering and Strain gauges
    SDS Labs Schematics Archive
    Three-phase controlled rectifier circuit
    Radio Motor Controller Schematic



    Top