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Industry’s Most Highly Integrated Piezo Haptic Driver Eric Siegel

Industry’s Most Highly Integrated Piezo Haptic Driver Eric Siegel Product Marketing Engineer, Touch Screen Controllers and Haptics THIS INFORMATION EMBARGOED UNTIL JULY 20. What is Haptics?. Touch screens are replacing traditional user interfaces Touch screens have one major disadvantage

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Industry’s Most Highly Integrated Piezo Haptic Driver Eric Siegel

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  1. Industry’s Most Highly Integrated Piezo Haptic Driver Eric Siegel Product Marketing Engineer, Touch Screen Controllers and Haptics THIS INFORMATION EMBARGOED UNTIL JULY 20

  2. What is Haptics? • Touch screens are replacing traditional user interfaces • Touch screens have one major disadvantage • No physical or mechanical feedback when the screen is pressed or an event occurs • Loss of tactile or haptic feedback • The solution is haptics…. • Haptics refers to the sense of touchand is a technology that provides mechanical feedback through the use of vibrations to simulate specific events or effects. • Benefits of Haptics • Improves task performance • Increases user satisfaction • Provides a more realistic experience

  3. TSC Touch Location Applications Processor/ Chipset reference design Haptics Driver Haptics effects Haptics SW Haptics SW Haptics actuators Touch ecosystem Touch Panel and Display Touch Screen Controller Haptics Driver Note: Haptics Software stored in only one of two locations THIS INFORMATION EMBARGOED UNTIL JULY 20

  4. Piezo actuator-based haptics • Enables high-definition and localized Haptics effect generation • Piezo actuators are very thin (<1mm) • Piezo actuators are either single-layer or multi-layer • Single Layer • Need up to 200 Vp-p to drive • More cost effective • Have low capacitance and can be driven with lower current • Multi-layer • Need up to 50Vp-p to drive multi-layer piezos • Cost scales linearly with the number of piezo layers • Have high capacitance and needs higher current drive

  5. Introducing the DRV8662 Industry’s most integrated single-chip piezo haptic driver • High analog integration (boost converter, diode) • 50% smaller solution size than leading competition • Does not need an external transformer • 40% lower system solution cost than leading competition • Analog input • Can be driven by DAC or filtered pulse width modulation (PWM) • GPIO gain control • Supports wide range of piezo actuator voltages • 50-200 - volt peak to peak (Vpp) differential outputs • Drive high-definition inaudible haptics effects • Haptics frequencies up to 500-Hz • Enables wide variety of high-resolution haptics effects THIS INFORMATION EMBARGOED UNTIL JULY 20

  6. Feel the difference • Localized responses on the screen • Pluck a string on your guitar app and feel the frequency associated with that string, in the exact spot you’re touching • Get haptic feedback from the smallest actions onscreen • Feel each time your “bird missile” ruffles its feathers or slams into the wooden blocks THIS INFORMATION EMBARGOED UNTIL JULY 20

  7. Applications

  8. Actuator response Response and accuracy of haptics effects Inertial • Low bandwidth • Start-up and response times are slower • Lower bandwidth limits types of effects • Motor (ERM) or linear actuator (LRA) • DRV8601 Piezo • High bandwidth • Fastest response time and largest bandwidth • Wider range of effects • Piezo bender or piezo module • DRV8662 THIS INFORMATION EMBARGOED UNTIL JULY 20

  9. Bandwidth profiles Piezo actuators offer higher bandwidth than inertial actuators Strength ERM spinning ERM/ LRA pulsing LRA direct drive Piezo direct drive 50Hz 175Hz 300Hz Piezo pulsing Frequency

  10. Response time of the DRV8662 Inertial Actuators vs. Piezo Actuators Piezo (DRV8662) Faster response time ERM, LRA Strength ~30-60ms <1ms Time THIS INFORMATION EMBARGOED UNTIL JULY 20

  11. Competition vs. DRV8662 Competition’s flyback solution TI DRV8662 Integrated, high-voltage process solution • Low voltage process • Transformer – bulky, expensive • External FET • External eiode • Difficult charge/discharge control schemes that are separated • Total board space ~200mm2 • High voltage process • Transformer-less • Integrated FET • Integrated diode • Simple Op-Amp voltage controlled feedback allowing adjustable gain • Total Board Space ~100mm2

  12. DRV8662 evaluation kit Touch panel glass with Piezo Actuator assembly MSP430G2253 DRV8662 • Complete Haptics Evaluation • I2C Interface through MSP430 • Analog / PWM input option to the DRV8662 with I2C bypass • Programmable MSP430 with sample code THIS INFORMATION EMBARGOED UNTIL JULY 26

  13. Summary 50% smaller with no external transformer Small solution size Low solution cost 40% lower cost with no expensive external transformer 50 to 200-Vpp differential drive High-definition haptics effects Flexible architecture Can drive single or multi-layer piezo actuators

  14. For your readers • DRV8662 Product Folder • www.ti.com/drv8662-pr • “What is haptics?” video • www.ti.com/drv8662video-pr • Technical support for touch products • www.ti.com/touchforum-pr

  15. Thank You

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