SLOS854D May 2014 – March 2018 DRV2605L
When the DRV2605L device is in analog-input interface mode, the device accepts an analog voltage at the IN/TRIG pin. The DRV2605L device drives the actuator continuously in analog-input interface mode until the user sets the device to standby mode or to enter another interface mode. The reference voltage in standby mode is 1.8 V. Therefore, the 1.8-V reference voltage is interpreted as a 100% input value. A reference voltage of 0.9 V is interpreted as a 50% input value and a reference voltage of 0 V is interpreted as a 0% input value. The input value in standby mode is analogous to the duty-cycle percentage in PWM mode.
For the LRA, the DRV2605L automatically tracks the resonance frequency unless the LRA_OPEN_LOOP bit is set (in register 0x1D). If the LRA_OPEN_LOOP bit is set, the LRA is driven according to the open-loop frequency set in OL_LRA_PERIOD[6:0] bit in register 0x20.