TI's highly integrated piezo haptic driver sports ultra-fast startup

by Toni McConnel , TechOnline India - July 21, 2011

The DRV8662 is a highly integrated piezo haptic driver for mobile consumer and industrial designs

The DRV8662 from Texas Instruments Incorporated is a highly integrated piezo haptic driver for mobile consumer and industrial designs. It features an integrated 105-V boost converter, power diode, and 50-V to 200-V peak-to-peak (Vpp) fully-differential amplifier, resulting in a solution size that is 50 percent smaller than leading competitors.

The DRV8662 also lowers total solution cost by 40 percent compared to competing solutions, thanks to an efficient, transformerless design. With the capability to drive a wide range of piezo actuator voltages and fast start-up time, the DRV8662 enables designers to create fast, high-definition haptic designs.

The integration of the DRV8662 haptics driver makes it easy to include effects like localized vibrations and frequency variations in both touch screen-input devices and those without a touch screen, from mobile phones and tablets to computer accessories, home appliances, and industrial automation consoles.


 DRV8662 evaluation module


Key features and benefits

Piezo modules enable fast start-up time (1.5 milliseconds), thin form-factor and high bandwidth, resulting in the production of haptic effects not possible with intertial-based actuators. Drives piezo actuator capacitances from 50 to 680 nanofarad (nF) at 300 Hz, enabling a wide variety of high-resolution haptic effects, including feedback localized to specific areas of the device, as well as
vibrations and pulses that change in frequency based on how the user is interacting with the device.Transformer-less design and wide supply range of 3.0 to 5.5-V with direct battery connection reduces solution size and cost.Thermal overload protection prevents damage when the device is overdriven.

Availability and pricing

The DRV8662 is available now in a 4-mm x 4-mm x 0.9-mm QFN package,
priced at $1.75 in quantities of 1,000. Order DRV8662 samples and
evaluation modules at www.ti.com/drv8662-pr. Watch a Q&A series with a TI haptics expert about implementing piezo haptics solutions at www.ti.com/drv8662video-pr.

An evaluation module is available for the DRV8662, priced at $100, and
includes a fully-programmable MSP430G2553, as well as analog and digital
interfaces for complete standalone and in-system evaluation. Out of the box, the MSP430 is programmed with sample haptic waveforms for immediate evaluation. To view more information, including reference material and sample code, and to place an order, visit www.ti.com/drv8662evm-pr.

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