DRV2625 Datasheet, PDF (50/77 Pages) Texas Instruments – DRV2625 Ultra Low Power Closed-Loop LRA/ERM Haptic Driver with Built-In Library

DRV2625
SLOS879A – DECEMBER 2015 – REVISED DECEMBER 2015
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8.7.29 Address: 0x1C
Figure 70. 0x1C
7
6
5
4
3
2
1
0
SNT[7:0]
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 32. Address: 0x1C
BIT FIELD
7-0 SNT[7:0]
TYPE
R/W
DEFAULT DESCRIPTION
0
Adds a time offset to the negative sustain portion of the library waveforms. Some motors have
faster/slower response time than others, therefore this register allows the user to add or take
away negative sustain time from the library waveforms. Any negative voltage value other than
the overdrive portion will be considered a sustain negative value. The offset is interpreted as
two’s complement, so the time offset may be positive or negative. Sustain Time Negative Offset
(ms) = SNT[7:0] × PLAYBACK_INTERVAL.
8.7.30 Address: 0x1D
Figure 71. 0x1D
7
6
5
4
3
2
1
0
BRT[7:0]
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
BIT FIELD
7-0 BRT[7:0]
Table 33. Address: 0x1D
TYPE
R/W
DEFAULT DESCRIPTION
0
Adds a time offset to the braking portion of the library waveforms. Some motors require more
braking time than others, therefore this register allows the user to add or take away brake time
from the library waveforms. The most negative voltage value in the library waveform is
automatically determined to be the braking portion. This register will only be useful in open loop
mode. Braking is automatic for closed loop mode. The offset is interpreted as two’s
complement, so the time offset may be positive or negative. Time Brake Offset (ms) = BRT[7:0]
× PLAYBACK_INTERVAL.
8.7.31 Address: 0x1F
Figure 72. 0x1F
7
6
5
4
3
RATED_VOLTAGE[7:0]
R/W-0
R/W-0
R/W-1
R/W-1
R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
2
R/W-1
1
R/W-1
0
R/W-1
BIT FIELD
7-0 RATED_VOLTAGE[7:0]
Table 34. Address: 0x1F
TYPE
R/W
DEFAULT DESCRIPTION
63
This bit sets the reference voltage for full-scale output during closed-loop operation. The auto-
calibration routine uses this register as an input, therefore this register must be written with the
rated voltage value of the motor before calibration is performed. Modification of this register
value should be followed by calibration to set A_CAL_BEMF appropriately.
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