DRV2605L-Q1 Datasheet, PDF (26/67 Pages) Texas Instruments – Automotive Haptic Driver for LRA and ERM

DRV2605L-Q1
SLOS874A – OCTOBER 2015 – REVISED OCTOBER 2015
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Programming (continued)
The following instructions list the step-by-step register configuration for auto-calibration. For additional details see
the Register Map section.
1. Apply the supply voltage to the DRV2605L-Q1 device, and pull the EN pin high. The supply voltage should
allow for adequate drive voltage of the selected actuator.
2. Write a value of 0x07 to register 0x01. This value moves the DRV2605L-Q1 device out of STANDBY and
places the MODE[2:0] bits in auto-calibration mode.
3. Populate the input parameters required by the auto-calibration engine:
(a) ERM_LRA — selection will depend on desired actuator.
(b) FB_BRAKE_FACTOR[2:0] — A value of 2 is valid for most actuators.
(c) LOOP_GAIN[1:0] — A value of 2 is valid for most actuators.
(d) RATED_VOLTAGE[7:0] — See the Rated Voltage Programming section for calculating the correct
register value.
(e) OD_CLAMP[7:0] — See the Overdrive Voltage-Clamp Programming section for calculating the correct
register value.
(f) AUTO_CAL_TIME[1:0] — A value of 3 is valid for most actuators.
(g) DRIVE_TIME[3:0] — See the Drive-Time Programming for calculating the correct register value.
(h) SAMPLE_TIME[1:0] — A value of 3 is valid for most actuators.
(i) BLANKING_TIME[3:0] — A value of 1 is valid for most actuators.
(j) IDISS_TIME[3:0] — A value of 1 is valid for most actuators.
(k) ZC_DET_TIME[1:0] — A value of 0 is valid for most actuators.
4. Set the GO bit (write 0x01 to register 0x0C) to start the auto-calibration process. When auto calibration is
complete, the GO bit automatically clears. The auto-calibration results are written in the respective registers
as shown in Figure 24.
5. Check the status of the DIAG_RESULT bit (in register 0x00) to ensure that the auto-calibration routine is
complete without faults.
6. Evaluate system performance with the auto-calibrated settings. Note that the evaluation should occur during
the final assembly of the device because the auto-calibration process can affect actuator performance and
behavior. If any adjustment is required, the inputs can be modified and this sequence can be repeated. If the
performance is satisfactory, the user can do any of the following:
(a) Repeat the calibration process upon subsequent power ups.
(b) Store the auto-calibration results in host processor memory and rewrite them to the DRV2605L-Q1
device upon subsequent power ups. The device retains these settings when in STANDBY mode or when
the EN pin is low.
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