SLOS825E December 2012 – April 2018 DRV2605
The BEMF_GAIN[1:0] bit sets the analog gain for the back-EMF amplifier. The auto-calibration routine automatically populates the bit with the most appropriate value for the actuator.
Modifying the SAMPLE_TIME[1:0] bit also adjusts the back-EMF gain. The higher the sample time, the higher the gain.
By default, the back-EMF is sampled once during a period. In the event that a twice per-period sampling is desired, assert the LRA_DRIVE_MODE bit.