DRV2624 Datasheet, PDF (34/79 Pages) Texas Instruments – DRV2624 Ultra Low Power Closed-Loop LRA/ERM Haptic Driver with Internal Memory

DRV2624
SLOS893A – DECEMBER 2015 – REVISED DECEMBER 2015
www.ti.com
8.6.9.4 Waveform Playback Triggers
The DRV2624 device has 2 modes of waveform playback: Waveform Sequencer and RTP. Both modes can be
triggered externally by using the TRIG/INTZ pin or internally by using the GO bit. If using external trigger, the
TRIG_PIN_FUNC most be selected appropriately.
8.6.9.4.1 Playback Trigger Without Automatic Brake into Standby
When automatic braking into standby is disabled (AUTO_BRK_INTO_STBY bit set to 0), playback can be
triggered in both RTP and waveform sequencer modes with internal trigger by writing a 1 to the GO bit, and
stopped by writing a 0 to the GO bit. Playback can also be triggered by the external trigger by following the
trigger-pulse or trigger-level specifications (see Figure 19 and Figure 20 for details). Note that internal trigger is
not available if the external trigger pin is set to trigger-level (TRIG_PIN_FUNC = 1)
RTP playback (MODE[1:0] = 0), once triggered, will run indefinitely until the waveform is stopped. The waveform
sequencer (MODE[1:0] = 1) will run until it reaches the end point and will automatically go into standby without a
cancel trigger being received, unless an infinite loop is requested.
8.6.9.4.1.1 Playback Trigger With Automatic Brake into Standby (SimpleDrive)
If automatic braking into standby is enabled (AUTO_BRK_INTO_STBY bit is set to 1), then the device part will go
into brake mode before going into standby. This feature introduces new timing requirements that are described in
below diagrams.
Start
TRIG/INTZ
Auto-Braking
Waveform
Ends
Start
TRIG/INTZ
Auto-Braking
Waveform
Ends
Haptic Waveform
Haptic Waveform
Internal Standby Signal
50 ms
Figure 34. Waveform Sequencer with Trigger-Pulse
Start
TRIG/INTZ
Auto-Braking
Waveform
Ends
Haptic Waveform
Internal Standby Signal
50 ms
Figure 35. Waveform Sequencer with Trigger-Level
Start Stop
TRIG/INTZ
Haptic Waveform
Ignore Auto-Brake
0.5 ms _{Waveform does not start}
Internal Standby Signal
50 ms
Figure 36. Waveform Sequencer with Trigger-Level
Behavior when TRIG/INTZ Pin Left High
Start
Auto-Braking
Stop
TRIG/INTZ
Internal Standby Signal
Figure 37. Fast Start Stop with Trigger-Pulse (RTP or
Waveform Sequencer)
Start
TRIG/INTZ
Auto-Braking
Stop
Haptic Waveform
Haptic Waveform
Internal Standby Signal
50 ms
Figure 38. Playback Start and stop Trigger (Pulse) (RTP or
Waveform Sequencer)
Internal Standby Signal
50 ms
Figure 39. Playback Start and stop Trigger (Level)(RTP or
Waveform Sequencer)
34
Submit Documentation Feedback
Product Folder Links: DRV2624
Copyright © 2015, Texas Instruments Incorporated