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
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图3.平板电脑和电子书系统方框图
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