DRV2604L Datasheet, PDF (46/73 Pages) Texas Instruments – DRV2604L 2- to 5.2-V Haptic Driver for LRA and ERM with Internal Memory and Smart-Loop Architecture

DRV2604L
SLOS866D – MAY 2014 – REVISED JUNE 2015
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8.6.14 Auto-Calibration Back-EMF Result (Address: 0x19)
Figure 46. 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-0
Table 16. Auto-Calibration Back-EMF Result Register Field Descriptions
0
R/W-0
BIT FIELD
7-0 A_CAL_BEMF[7:0]
TYPE
R/W
DEFAULT
0x6C
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 DRV2604L
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]
46
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