DRV2625 Datasheet, PDF (38/77 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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8.7.6 Address: 0x05
Figure 47. 0x05
7
6
5
4
3
2
Reserved
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 9. Address: 0x05
1
0
LRA_PERIOD[9:8]
RO-0
BIT FIELD
7-2 Reserved
1-0 LRA_PERIOD[9:0]
TYPE
R/W
RO
DEFAULT DESCRIPTION
0
Reserved
0
This parameter reports the resonance frequency of the LRA in real time. Because this register
is continuously being updated, the MSB section most be read first, the LSB (and the MSB)
register will be retained until the LSB is read to preserve consistency. If the waveform finishes
and the LSB has not been read, the device will automatically unlock both registers (MSB and
LSB) and they will start to update again upon the next playback. For this reason, TI
recommends reading both registers during the same playback to get accurate readings. LRA
period = LRA_PERIOD[9:0] × 24.39 us. The accuracy of the reported frequency is not
guaranteed during braking.
8.7.7 Address: 0x06
Figure 48. 0x06
7
6
5
4
3
2
1
0
LRA_PERIOD[7:0]
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
BIT FIELD
7-0 LRA_PERIOD[9:0]
Table 10. Address: 0x06
TYPE
R
DEFAULT DESCRIPTION
0
This parameter reports the resonance frequency of the LRA in real time. Because this register
is continuously being updated, the MSB section most be read first, the LSB (and the MSB)
register will be retained until the LSB is read to preserve consistency. If the waveform finishes
and the LSB has not been read, the device will automatically unlock both registers (MSB and
LSB) and they will start to update again upon the next playback. For this reason, it is important
to read both registers during the same playback to get accurate readings. LRA period =
LRA_PERIOD[9:0] × 24.39 us. The accuracy of the reported frequency is not guaranteed
during braking.
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