DatasheetProduct Overview
DA7280 is a linear resonant actuator (LRA) and eccentric rotating mass (ERM) haptic driver offering automatic closed-loop LRA resonant frequency tracking. The feature guarantees consistency across LRA production tolerances, operating temperature, aging, and mechanical coupling. DA7280 offers wideband operation that fully utilizes the capabilities of newer wideband and multi-directional LRAs.
The differential output drive architecture and continuous actuator motion sensing enable efficient, calibration-free playback and minimize software complexity. Featuring wake-up on General Purpose Input (GPI) sequence triggers and/or I2C activity, DA7280 automatically returns to a low quiescent current state (typically 0.36 µA) between playbacks. At only 20 % of the idle current of the nearest alternative solution, DA7280 significantly extends battery life in mobile systems.
To reduce system complexity, an integrated Waveform Memory allows haptic sequences to be preloaded to DA7280. Independent sequences can be triggered, with low-latency (0.75 ms), by up to three separate input pins without host interaction. Haptic sequences can also be streamed to DA7280 from an external source via I2C or pulse width modulated (PWM) signal.
DA7280 actively monitors the back electromotive force (BEMF) while continuously driving and applies closed-loop Active Acceleration and Rapid Stopping for sharper clicks and a higher fidelity user experience. This offers significant advantages over existing solutions that need to move into a high-impedance state during drive to measure the BEMF, which adds a considerable amount of inactive time to the sequence and lowers the effective click strength for a given LRA.
