MAX11835,pdf datasheet (Haptic

The MAX11835 haptic (tactile) piezo controller provides a complete solution to drive ceramic piezo actuators to create haptic feedback for products featuring user touch interfaces. The MAX11835 can drive single-layer or multilayer piezo actuators over a wide range of voltages up to 250V. It efficiently generates any type of userprogrammable waveforms including sine, trapezoidal, square, and pulse to drive the piezo loads to create custom haptic sensations. The low-power MAX11835 directly interfaces with an application processor/host controller through a standard serial interface and integrates various blocks including a boost regulator, pattern storage memory, and waveform generator block in one package, thus providing a complete piezo driver solution.

The MAX11835 contains a boost regulator that uses an external flyback to efficiently generate high-voltage waveforms up to 250V to drive piezo actuators while limiting current drain. The boost regulator features an internal n-channel MOSFET to set current limit and control the drain from the battery or power supply.

The MAX11835 features user-programmable touch feedback pattern storage memory that drives the waveform generator with piecewise linear data using 8-bit resolution. The device also offers a trigger feature that makes it possible to use multiple haptic piezo controllers in parallel to provide haptic sensations for larger displays. Its smart, low-power, and standby modes reduce power consumption before, during, and after waveform generation. The MAX11835 goes into low-power mode after a haptic event to save power automatically.

The MAX11835 offers a fast 400kHz, I²C serial interface to allow programming of various modes of operation, status checking, and haptic waveforms. The operating supply range includes 1.7V to 3.6V for digital supply and 2.7V to 5.25V for V_BATT and AVDD.