SLOS825E December 2012 – April 2018 DRV2605
This register contains the rated back-EMF result after execution of auto calibration. The A_CAL_BEMF[7:0] bit is the level of back-EMF voltage that the actuator gives when the actuator is driven at the rated voltage. The DRV2605 playback engine uses this the value stored in this bit to automatically determine the appropriate feedback gain for closed-loop operation.
Auto-calibration back-EMF (V) = (A_CAL_BEMF[7:0] / 255) × 1.22 V / BEMF_GAIN[1:0]