TIDRV8662平板电脑单片压电触摸屏驱动解决方案

本文介绍了DRV8662主要特性,功能框图,以及DRV8662EVM评估模块主要特性和TI公司的平板电脑和电子书系统方框图.

The DRV8662 is a single-chip piezo haptic driver with integrated 105 V boost switch, integrated power diode, and integrated fully-differential amplifier. This versatile device is capable of driving both high-voltage and low-voltage piezo haptic actuators. The input signal can be either differential or single-ended. The DRV8662 supports four GPIO-controlled gains: 28.8 dB, 34.8 dB, 38.4 dB, and 40.7 dB.

The boost voltage is set using two external resistors, and the boost current limit is programmable via the REXT resistor. The boost converter architecture will not allow the demand on the supply current to exceed the limit set by the REXT resistor; therefore, the DRV8662 is well-suited for portable applications.

DRV8662主要特性:

High-Voltage Piezo Haptic Driver

Drives up to 100 nF at 200 VPP and 300 Hz

Drives up to 330 nF at 100 VPP and 300 Hz

Drives up to 680 nF at 50 VPP and 300 Hz

Differential Output

Integrated Boost Converter

Adjustable Boost Voltage

Adjustable Current Limit

Integrated Power FET and Diode

No Transformer Required

Fast Start Up Time of 1.5 ms

Wide Supply Voltage Range of 3.0 V to 5.5 V

1.8 V Compatible Digital Pins

Thermal Protection

Available in a 4 mm × 4 mm × 0.9 mm QFN package (RGP)

DRV8662应用:

Mobile Phones

Portable Gaming

Portable Navigation Devices

Tablet Devices

图1.DRV8662框图

DRV8662EVM评估模块

The DRV8662EVM Evaluation Module (EVM) is a fully-differential, high-voltage piezo actuator driver that provides quick response time for single layer and multi-layer piezo actuators. The DRV8662 drives piezo loads up to 200 V differentially using an adjustable 100V integrated boost converter. The evaluation module contains the DRV8662RGP piezo haptics driver, a programmable MSP430, and passive components for complete evaluation. This document contains the EVM schematic, PCB, and BOM as well as instructions for operating the EVM.

图2.DRV8662EVM评估模块外形图

DRV8662EVM评估模块主要特性:

? High-voltage haptics driver

? Drives single-layer and multi-layer piezo actuators

? Adjustable 200V differential output

? A programmable MSP430 with sample waveforms and I2C input

? External PWM and analog inputs

? Wide supply voltage range from 3.0V to 5.5V

Texas Instruments (TI) offers a variety of semiconductor solutions for tablets and eBooks. The OMAP? processor shown in the system diagram perfectly balances power and performance to give designers and end users an optimal multimedia solution. Also represented is an extensive array of solutions for tablets and eBooks that support wireless connectivity, video, audio and power management. The selection guide on the following page is a sampling of TI devices available to streamline your design process.

图3.平板电脑和电子书系统方框图