DRV2605L-Q1 Datasheet, PDF (44/67 Pages) Texas Instruments – Automotive Haptic Driver for LRA and ERM

DRV2605L-Q1
SLOS874A – OCTOBER 2015 – REVISED OCTOBER 2015
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7.6.22 Control2 (Address: 0x1C)
Figure 50. Control2 Register
7
BIDIR_INPUT
R/W-1
6
BRAKE_STABI
LIZER
R/W-1
BIT FIELD
7 BIDIR_INPUT
6 BRAKE_STABILIZER
5-4 SAMPLE_TIME[1:0]
5
4
SAMPLE_TIME[1:0]
3
2
BLANKING_TIME[1:0]
1
0
IDISS_TIME[1:0]
R/W-1
R/W-0
R/W-1
Table 25. Control2 Register Field Descriptions
R/W-0
R/W-1
TYPE
R/W
R/W
R/W
DEFAULT
1
1
1
DESCRIPTION
The BIDIR_INPUT bit selects how the engine interprets data.
0: Unidirectional input mode
Braking is automatically determined by the feedback conditions and is
applied when required. Use of this mode also recovers an additional bit
of vertical resolution. This mode should only be used for closed-loop
operation.
Examples::
0% Input → No output signal
50% Input → Half-scale output signal
100% Input → Full-scale output signal
1: Bidirectional input mode (default)
This mode is compatible with traditional open-loop signaling and also
works well with closed-loop mode. When operating closed-loop, braking
is automatically determined by the feedback conditions and applied
when required. When operating open-loop modes, braking is only
applied when the input signal is less than 50%.
Open-loop mode (ERM and LRA) examples:
0% Input → Negative full-scale output signal (braking)
25% Input → Negative half-scale output signal (braking)
50% Input → No output signal
75% Input → Positive half-scale output signal
100% Input → Positive full-scale output signal
Closed-loop mode (ERM and LRA) examples:
0% to 50% Input → No output signal
50% Input → No output signal
75% Input → Half-scale output signal
100% Input → Full-scale output signal
When this bit is set, loop gain is reduced when braking is almost complete to
improve loop stability
LRA auto-resonance sampling time (Advanced use only)
0: 150 µs
1: 200 µs
2: 250 µs
3: 300 µs
44
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