DRV2605L-Q1 Datasheet, PDF (41/67 Pages) Texas Instruments – Automotive Haptic Driver for LRA and ERM

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DRV2605L-Q1
SLOS874A – OCTOBER 2015 – REVISED OCTOBER 2015
7.6.17 Overdrive Clamp Voltage (Address: 0x17)
Figure 45. Overdrive Clamp Voltage Register
7
R/W-1
6
R/W-0
5
R/W-0
4
3
OD_CLAMP[7:0]
R/W-1
R/W-1
2
R/W-1
1
R/W-0
Table 20. Overdrive Clamp Voltage Register Field Descriptions
0
R/W-0
BIT FIELD
7
OD_CLAMP[7:0]
TYPE
R/W
DEFAULT
0x8C
DESCRIPTION
During closed-loop operation the actuator feedback allows the output voltage
to go above the rated voltage during the automatic overdrive and automatic
braking periods. This register sets a clamp so that the automatic overdrive is
bounded. This bit also serves as the full-scale reference voltage for open-loop
operation.
See the Overdrive Voltage-Clamp Programming section for calculating the
correct register value.
7.6.18 Auto-Calibration Compensation Result (Address: 0x18)
Figure 46. Auto-Calibration Compensation-Result Register
7
R/W-0
6
R/W-0
5
R/W-0
4
3
A_CAL_COMP[7:0]
R/W-0
R/W-1
2
R/W-1
1
R/W-0
0
R/W-0
Table 21. Auto-Calibration Compensation-Result Register Field Descriptions
BIT FIELD
7-0 A_CAL_COMP[7:0]
TYPE
R/W
DEFAULT
0x0C
DESCRIPTION
This register contains the voltage-compensation result after execution of auto
calibration. The value stored in the A_CAL_COMP bit compensates for any
resistive losses in the driver. The calibration routine checks the impedance of
the actuator to automatically determine an appropriate value. The auto-
calibration compensation-result value is multiplied by the drive gain during
playback.
Auto-calibration compensation coefficient = 1 + A_CAL_COMP[7:0] / 255
7.6.19 Auto-Calibration Back-EMF Result (Address: 0x19)
Figure 47. Auto-Calibration Back-EMF Result Register
7
R/W-0
6
R/W-1
5
R/W-1
4
3
A_CAL_BEMF[7:0]
R/W-0
R/W-1
2
R/W-1
1
R/W-1
0
R/W-1
Table 22. Auto-Calibration Back-EMF Result Register Field Descriptions
BIT FIELD
7-0 A_CAL_BEMF[7:0]
TYPE
R/W
DEFAULT
0x6F
DESCRIPTION
This register contains the rated back-EMF result after execution of auto
calibration. The A_CAL_BEMF[7:0] bit is the level of back-EMF voltage that the
actuator gives when the actuator is driven at the rated voltage. The DRV2605L-
Q1 playback engine uses this the value stored in this bit to automatically
determine the appropriate feedback gain for closed-loop operation.
Auto-calibration back-EMF (V) = (A_CAL_BEMF[7:0] / 255) × 1.22 V /
BEMF_GAIN[1:0]
Copyright © 2015, Texas Instruments Incorporated
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