DRV2604L Demonstration Program
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2.2.3
Mode 3 – LRA Clicks
Mode 3 shows what the waveforms look like with and without braking and how closed-loop and open-loop
mode affects the acceleration profile.
Figure 8
and
Figure 9
demonstrate single-cycle clicks. 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 10
shows a closed-loop waveform (with overdrive and braking) while
Figure 11
shows open-
loop mode that does not have overdrive or braking. Overdrive and braking allows the waveform to feel
more crisp.
Figure 8. LRA Single-Cycle Click (Button 2)
Figure 9. LRA Single-Cycle with Braking (Button 3)
Figure 10. LRA Closed-Loop Click Waveform (Button 1)
Figure 11. LRA Open-Loop Click Waveform (Button 4)
8
DRV2604L ERM, LRA Haptic Driver Evaluation Kit
SLOU390A – May 2014 – Revised June 2014
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