DRV2624 Datasheet, PDF (60/79 Pages) Texas Instruments – DRV2624 Ultra Low Power Closed-Loop LRA/ERM Haptic Driver with Internal Memory

DRV2624
SLOS893A – DECEMBER 2015 – REVISED DECEMBER 2015
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8.7.44 Address: 0x2C
Figure 88. 0x2C
7
6
5
4
LRA_AUTO_O
PEN_LOOP[0]
AUTO_OL_CNT[1:0]
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
3
2
Reserved
R/W-0
Table 45. Address: 0x2C
1
0
LRA_WAVE_S
HAPE[0]
R/W-0
BIT FIELD
7 LRA_AUTO_OPEN_LOOP
6-5 AUTO_OL_CNT[1:0]
4-1 Reserved
0 LRA_WAVE_SHAPE
TYPE
R/W
R/W
R/W
R/W
DEFAULT DESCRIPTION
0
When enabled, the driver will automatically switch to open loop if ZC is not detected correctly
for the number of cycles specified in AutoOpenLoop_CNT. The shape of the waveform for the
open-loop will always be square, the LRA_WAVE_SHAPE bit will be ignored for this function.
0
Disable auto-open-loop.
1
Enable auto-open-loop.
0
Counter used when AutoOpenLoop = 1 to decide when to switch to open loop
0
3 attempts
1
4 attempts
2
5 attempts
3
6 attempts
0
Reserved
0
Selects which shape to use for driving the LRA when in open loop mode.
0
Square Wave.
1
Sine Wave.
8.7.45 Address: 0x2E
Figure 89. 0x2E
7
6
5
4
3
Reserved
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
2
1
0
OL_LRA_PERIOD[9:8]
R/W-0
BIT FIELD
7-2 Reserved
1-0 OL_LRA_PERIOD[9:0]
Table 46. Address: 0x2E
TYPE
R/W
R/W
DEFAULT DESCRIPTION
0
Reserved
198 This parameter sets the frequency that will be used to drive the LRA in open loop. LRA open
loop period = OL_LRA_PERIOD[9:0] × 24.39 us.
8.7.46 Address: 0x2F
Figure 90. 0x2F
7
6
5
4
3
OL_LRA_PERIOD[7:0]
R/W-1
R/W-1
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
2
R/W-1
1
R/W-1
0
R/W-0
BIT FIELD
7-0 OL_LRA_PERIOD[9:0]
Table 47. Address: 0x2F
TYPE
R/W
DEFAULT DESCRIPTION
198 This parameter sets the frequency that will be used to drive the LRA in open loop. LRA open
loop period = OL_LRA_PERIOD[9:0] × 24.615 us.
60
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