DRV2603_14 Datasheet, PDF (5/19 Pages) Texas Instruments – Haptic Drive with Auto-Resonance Detection for Linear Resonance Actuators (LRA)

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DRV2603
SLOS754A – JUNE 2012 – REVISED JANUARY 2014
TYPICAL CHARACTERISTICS (continued)
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LRA PWM Modulation
ERM PWM Modulation
VDD = 3.6 V
LRA Mode
PWM Sequence =
{100%, 87.5%, 75%, 62.5%, 0%}
EN
PWM (Filtered)
[OUT+] − [OUT−] (Filtered)
VDD = 3.6 V
ERM Mode
PWM Sequence =
{100%, 87.5%, 75%, 62.5%, 0%}
EN
PWM (Filtered)
[OUT+] − [OUT−] (Filtered)
0
40m
80m
120m
160m
200m
t − Time − s
Figure 5.
0
40m
80m
120m
160m
200m
t − Time − s
Figure 6.
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TEST SETUP FOR GRAPHS
With no output filter, the output waveform from the DRV2603 looks similar to Figure 1. The output signal contains
both a high frequency PWM component and a fundamental drive component which causes motion in the
actuator. To measure or observe the fundamental drive component, a low-pass filter must be used to eliminate
the PWM component. The digital filter function on a digital oscilloscope was utilized in the rest of the Typical
Characteristic figures. A 1^st order, low-pass filter corner between 1 kHz and 3.5 kHz is recommended.
OUT+
OUT–
ERM
or
LRA
Ch1
Ch1-Ch2
(Differential)
Ch2 _{with Digital}
Low-Pass Filter
Oscilloscope
Figure 7. Test Setup for Graphs
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