SLOS825E December 2012 – April 2018 DRV2605
When the DRV2605 device is in PWM interface mode, the device accepts PWM data at the IN/TRIG pin. The DRV2605 device drives the actuator continuously in PWM interface mode until the user sets the device to standby mode or to enter another interface mode. In standby mode, the strength of vibration is determined by the duty cycle.
For the LRA, the DRV2605 device automatically tracks the resonance frequency unless the LRA_OPEN_LOOP bit in register 0x1D is set. If the LRA_OPEN_LOOP bit is set, the LRA is driven according to the frequency of the PWM input signal. Specifically, the driving frequency is the PWM frequency divided by 128.