DRV2604L Datasheet, PDF (45/73 Pages) Texas Instruments – DRV2604L 2- to 5.2-V Haptic Driver for LRA and ERM with Internal Memory and Smart-Loop Architecture

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DRV2604L
SLOS866D – MAY 2014 – REVISED JUNE 2015
8.6.11 Rated Voltage (Address: 0x16)
Figure 43. Rated Voltage Register
7
R/W-0
6
R/W-0
BIT FIELD
7-0 RATED_VOLTAGE[7:0]
5
R/W-1
4
3
RATED_VOLTAGE[7:0]
R/W-1
R/W-1
2
R/W-1
Table 13. Rated Voltage Register Field Descriptions
1
R/W-1
0
R/W-0
TYPE
R/W
DEFAULT
0x3E
DESCRIPTION
This bit sets the reference voltage for full-scale output during closed-loop
operation. The auto-calibration routine uses this register as an input, therefore
this register must be written with the rated voltage value of the motor before
calibration is performed. This register is ignored for open-loop operation
because the overdrive voltage sets the reference for that case. Any
modification of this register value should be followed by calibration to set
A_CAL_BEMF appropriately.
See the Rated Voltage Programming section for calculating the correct register
value.
8.6.12 Overdrive Clamp Voltage (Address: 0x17)
Figure 44. 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-0
1
R/W-1
0
R/W-1
BIT FIELD
7
OD_CLAMP[7:0]
Table 14. Overdrive Clamp Voltage Register Field Descriptions
TYPE
R/W
DEFAULT
0x9B
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.
8.6.13 Auto-Calibration Compensation Result (Address: 0x18)
Figure 45. 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 15. 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
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