Texas Instruments introduced the most highly integrated piezo haptic driver for mobile consumer and industrial designs. The DRV8662 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, transformer-less design. With the capability to drive a wide range of piezo actuator voltages and fast start-up time, the DRV8662 benefits designers creating fast, high-definition haptic designs.
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.
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.
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.
A simulation model for the DRV8662 is also available in TINA-TI 9.1, a SPICE-based analog simulation program. Download TINA-TI 9.1 at www.ti.com/tina-ti-download-pr.
The DRV8662 can be used with TI’s OMAP™ family of processors in touch screen-enabled devices, such as handsets. The processing power of the OMAP devices, coupled with the high-definition haptic effects enabled by the DRV8662, significantly improve the user experience.
DRV8662 - Integrated Piezo Haptic Driver for Mobile Consumer and Industrial Designs (Photo from TI Website)