DRV2605L-Q1 Datasheet, PDF (38/67 Pages) Texas Instruments – Automotive Haptic Driver for LRA and ERM

DRV2605L-Q1
SLOS874A – OCTOBER 2015 – REVISED OCTOBER 2015
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7.6.9 Sustain Time Offset, Negative (Address: 0x0F)
Figure 37. Sustain Time Offset, Negative Register
7
BIT FIELD
7-0 SNT
6
5
4
3
2
1
0
SNT[7:0]
R/W-0
Table 12. Sustain Time Offset, Negative Register Field Descriptions
TYPE
R/W
DEFAULT
0
DESCRIPTION
This bit adds a time offset to the negative sustain portion of the library
waveforms. Some motors have a faster or slower response time than
others, therefore this register allows the user to add or remove negative
sustain time from the library waveforms. Any negative voltage value other
than the overdrive portion is considered as a sustaining negative value. The
offset is interpreted as two’s complement, therefore the time offset can be
positive or negative.
Sustain-Time Negative Offset (ms) = SNT[7:0] ×
PLAYBACK_INTERVAL
See the Control5 (Address: 0x1F) section for PLAYBACK_INTERVAL
details.
7.6.10 Brake Time Offset (Address: 0x10)
Figure 38. Brake Time Offset Register
7
6
5
4
3
2
1
0
BRT[7:0]
R/W-0
BIT FIELD
7-0 BRT
Table 13. Brake Time Offset Register Field Descriptions
TYPE
R/W
DEFAULT DESCRIPTION
0
This bit 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 is only useful in open-loop
mode. Braking is automatic for closed-loop mode. The offset is interpreted as
2s complement, therefore the time offset can be positive or negative.
Brake Time Offset (ms) = BRT[7:0] × PLAYBACK_INTERVAL
See the Control5 (Address: 0x1F) section for PLAYBACK_INTERVAL
details.
38
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