The device is a piezo haptic driver with integrated 105-V
boost switch, integrated power diode, integrated fully-differential amplifier, and integrated
digital front end. This versatile device is capable of driving both high-voltage and low-voltage
piezo haptic actuators. The input signal can be driven as haptic packets over the
I2C port or through the analog inputs.
The digital interface of the 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 first-in, first-out buffer (FIFO) will automatically wake up the device and
begin playing the waveform after the 2 ms internal start-up procedure. When the data flow stops or
the FIFO under-runs, the device will automatically enter a pop-less
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 device an ideal piezo driver for fast haptic responses.
Thermal overload protection prevents the device from being damaged when overdriven.
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