SLOU432B December 2015 – December 2021 DRV2625
2.2.1 Mode Off – Haptics Effect Sequences
Below are a set of ERM and LRA Sharp Click waveforms. The four effects below show the difference between closed and open loop operation for both ERM and LRA.
In closed-loop operation for ERM’s, the driver automatically overdrives and brakes the actuator. In open-loop, the waveform must be predefined with overdrive and braking.
For LRA’s in closed-loop, the driver automatically tracks the resonant frequency, and overdrives and brakes the actuator. In open-loop, the waveform must be predefined with a static drive frequency, and overdrive and braking times.
Figure 2-1 LRA Sharp Click Closed Loop Waveform
Figure 2-3 ERM Sharp Click Closed Loop Waveform
Figure 2-2 LRA Sharp Click Open Loop Waveform
Figure 2-4 ERM Sharp Click Open Loop Waveform