DRV2605L Datasheet, PDF (37/69 Pages) Texas Instruments – DRV2605L 2 to 5.2 V Haptic Driver for LRA and ERM With Effect Library and Smart-Loop Architecture

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DRV2605L
SLOS854C – MAY 2014 – REVISED SEPTEMBER 2014
8.6.5 Waveform Sequencer (Address: 0x04 to 0x0B)
Figure 34. Waveform Sequencer Register
7
6
5
4
3
2
1
0
WAIT
WAV_FRM_SEQ[6:0]
R/W-0
R/W-0
Table 8. Waveform Sequencer Register Field Descriptions
BIT FIELD
7 WAIT
6-0 WAV_FRM_SEQ
TYPE
R/W
R/W
DEFAULT
0
0
DESCRIPTION
When this bit is set, the WAV_FRM_SEQ[6:0] bit is interpreted as a wait
time in which the playback engine idles. This bit is used to insert timed
delays between sequentially played waveforms.
Delay time = 10 ms × WAV_FRM_SEQ[6:0]
If WAIT = 0, then WAV_FRM_SEQ[6:0] is interpreted as a waveform
identifier for sequence playback.
Waveform sequence value. This bit holds the waveform identifier of the
waveform to be played. A waveform identifier is an integer value referring
to the index position of a waveform in a ROM library. Playback begins at
register address 0x04 when the user asserts the GO bit (register 0x0C).
When playback of that waveform ends, the waveform sequencer plays the
next waveform identifier held in register 0x05, if the next waveform
identifier is non-zero. The waveform sequencer continues in this way until
the sequencer reaches an identifier value of zero, or all eight identifiers are
played (register addresses 0x04 through 0x0B), whichever comes first.
8.6.6 GO (Address: 0x0C)
Figure 35. GO Register
7
6
5
4
3
2
Reserved
1
0
GO
R/W-0
BIT FIELD
7-1 Reserved
0
GO
Table 9. GO Register Field Descriptions
TYPE
DEFAULT DESCRIPTION
R/W
0
This bit is used to fire processes in the DRV2605L device. The process
fired by the GO bit is selected by the MODE[2:0] bit (register 0x01). The
primary function of this bit is to fire playback of the waveform identifiers in
the waveform sequencer (registers 0x04 to 0x0B), in which case, this bit
can be thought of a software trigger for haptic waveforms. The GO bit
remains high until the playback of the haptic waveform sequence is
complete. Clearing the GO bit during waveform playback cancels the
waveform sequence. Using one of the external trigger modes can cause
the GO bit to be set or cleared by the external trigger pin. This bit can also
be used to fire the auto-calibration process or the diagnostic process.
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