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 interface.
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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