DRV2624 Datasheet, PDF (59/79 Pages) Texas Instruments – DRV2624 Ultra Low Power Closed-Loop LRA/ERM Haptic Driver with Internal Memory

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DRV2624
SLOS893A – DECEMBER 2015 – REVISED DECEMBER 2015
8.7.42 Address: 0x29
Figure 86. 0x29
7
6
Reserved
R/W-0
5
4
OD_CLAMP_TIME[1:0]
R/W-0
3
2
SAMPLE_TIME[1:0]
R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 43. Address: 0x29
1
0
ZC_DET_TIME[1:0]
R/W-0
BIT FIELD
7-6 Reserved
5-4 OD_CLAMP_TIME[1:0]
3-2 SAMPLE_TIME[1:0]
1-0 ZC_DET_TIME[1:0]
TYPE
R/W
R/W
R/W
R/W
DEFAULT DESCRIPTION
0
Reserved
0
This parameter allows the user to select the maximum time the overshoot will be allowed during
the overdrive and braking periods. If enabled, after this period the output voltage will clamp to
the rated voltage clamp. Note that since the output is being clamped at a specified amount of
time, it may not coincide with a zero-crossing, During autocal or diagnostics, this parameter is
ignored. Autocal always uses automatic overdrive.
0
Automatic Overdrive (overdrive time clamp is disabled)
1
Clamp overdrive time to 25 ms
2
Clamp overdrive time to 50 ms
3
Clamp overdrive time to 100 ms
3
Time to wait before/after zero-crossing before adc samples BEMF amplitude.
0
150 us.
1
200 us.
2
250 us.
3
300 us.
0
Zero crossing detection time.
0
100 us.
1
200 us.
2
300 us.
3
390 us.
8.7.43 Address: 0x2A
Figure 87. 0x2A
7
6
5
4
3
Reserved
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
2
1
0
AUTO_CAL_TIME[1:0]
R/W-1
R/W-0
BIT FIELD
7-2 Reserved
1-0 AUTO_CAL_TIME[1:0]
Table 44. Address: 0x2A
TYPE
R/W
R/W
DEFAULT DESCRIPTION
0
Reserved
2
Duration of autocal routine. Sets the length of the auto calibration time. This should be enough
time for the motor acceleration to settle when driven at the RATED_VOLTAGE value.
0
250 ms.
1
500 ms.
2
1000 ms.
Duration is trigger controlled (either external trigger, enable, or internal trigger).
3
Minimum duration should be 1 s, otherwise the result of the calibration may be
corrupted. Once the cancellation trigger is received, the calibration measurements will
be taken, which can take several milliseconds to complete.
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