TI DRV8662平板电脑单片压电触摸屏驱动解决方案
TI公司的DRV8662是集成了105V升压开关,功率二极管和高压和低压压电触摸激励器的单片压电触摸驱动器,输入信号可以是差分或单端,支持四种GPIO控制的增益: 28.8 dB, 34.8 dB, 38.4 dB和40.7 dB,工作电压3.0 V 到5.5 V,并具有热保护功能,主要用在手机,手持游戏机,PND和平板电脑.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
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