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 end
capable of driving both high-voltage and low-voltage piezo haptic actuators. This versatile device
supports HD haptics through the I2C port or through the analog inputs.
The digital interface of the DRV2667 device is available through an
I2C-compatible bus. A digital interface relieves the costly processor
burden of the PWM generation or additional analog channel requirements in the host system. Any
writes to the internal FIFO will automatically wake up the device and begin playing the waveform
after the 2-ms internal startup procedure. When the data flow stops or the FIFO under-runs, the
device will automatically enter a pop-less shutdown procedure.
The DRV2667 device also includes waveform memory to store and recall waveforms with
minimal latency as well as an advanced waveform synthesizer to construct complex haptic waveforms
with minimal memory usage. This provide a means of hardware acceleration, relieving the host
processor of haptic generation duties as well as minimizing bus traffic over the haptic
The boost voltage is set using two external resistors, and the boost current limit is
programmable through the REXT resistor. A typical start-up time of 2 ms
makes the DRV2667 an ideal piezo driver for fast haptic responses. Thermal overload protection
prevents the device from being damaged when overdriven.
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