The PJ91921 is a single-chip piezo actuator driver with energy recovery. It can drive actuators with waveforms up to 190 Vpk-pk while operating from a 2.3 to 5.5 V supply voltage. Its low power and small size make it ideal for applications requiring minimal power consumption. The PJ91921 features high-resolution piezo sensing capabilities allowing haptic feedback to be automatically played when detection conditions are met.

The PJ91921 differential driver achieves low distortion waveforms and quiet actuator operation. All settings are adjustable through the digital front end to reduce the BOM. Data and configuration parameters are easily communicated to the PJ91921 through its two wire I2C interface. A flexible deep FIFO enables the streaming of digital waveform data for playback or the transmission of burst data for more bandwidth efficiency. The PJ91921 also integrates 1.5 kB of RAM waveform memory to generate waveforms with minimal communication bandwidth.

A dedicated SYNC pin can synchronize multiple PJ91921 controllers to simultaneously drive multiple actuators within 2μs. In addition to SYNC synchronization, PJ91921 can also support CLK_SYNC synchronization. This function synchronizes the clock, and multiple chips share the same clock.

With a typical start-up time of less than 200μs, the PJ91921 latency is negligible in most systems. Various safety systems protect the PJ91921 from damage in case of a fault.