The DRV2667 device is a piezo haptic driver with integrated 105-V boost switch,integrated power diode, integrated fully-differential amplifier, and integrated digital front endcapable of driving both high-voltage and low-voltage piezo haptic actuators. This versatile devicesupports HD haptics through the I2C port or through the analog inputs.
The digital interface of the DRV2667 device is available through anI2C-compatible bus. A digital interface relieves the costly processorburden of the PWM generation or additional analog channel requirements in the host system. Anywrites to the internal FIFO will automatically wake up the device and begin playing the waveformafter the 2-ms internal startup procedure. When the data flow stops or the FIFO under-runs, thedevice will automatically enter a pop-less shutdown procedure.
The DRV2667 device also includes waveform memory to store and recall waveforms withminimal latency as well as an advanced waveform synthesizer to construct complex haptic waveformswith minimal memory usage. This provide a means of hardware acceleration, relieving the hostprocessor of haptic generation duties as well as minimizing bus traffic over the hapticinterface.
The boost voltage is set using two external resistors, and the boost current limit isprogrammable through the REXT resistor. A typical start-up time of 2 msmakes the DRV2667 an ideal piezo driver for fast haptic responses. Thermal overload protectionprevents the device from being damaged when overdriven.