SLOS825E December 2012 – April 2018 DRV2605
The DRV2605 auto-resonance engine tracks the resonant frequency of an LRA in real time, effectively locking onto the resonance frequency after half of a cycle. If the resonant frequency shifts in the middle of a waveform for any reason, the engine tracks the frequency from cycle to cycle. The auto-resonance engine accomplishes the tracking by constantly monitoring the back-EMF of the actuator. The auto-resonance engine is not affected by the auto calibration process, which is only used for level calibration. No calibration is required for the auto resonance engine. See the Auto-Resonance Engine Programming for the LRA section for auto-resonance engine programming information.