Texas Instruments DRV2605LEVM-MD, Руководство пользователя

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Typical Usage Examples
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6. If using the internal trigger mode, set the Go bit (in register 0x0C) to fire the effect or sequence of
effects. If using an external trigger mode, send an appropriate trigger pulse to the IN/TRIG pin. See the
Waveform Triggers section of the DRV2605L datasheet for details.
7. If desired, the user can repeat step 5 to figure the effect or sequence again.
8. Put the device in low-power mode by deasserting the EN pin through the TCA9554 device to set the
STANDBY bit.
NOTE: To send the same commands to multiple DRV2605L devices at the same time, configure the
TCA9554 and TCA9548A devices to the appropriate channel selections. I
2
C write functions
can be sent to multiple DRV2605L device, but I
2
C read functions for each DRV2605L device
must be read individually. One issue with write functions is the inability to properly determine
whether multiple DRV2605L devices are ACK (acknowledge) or NACK (not acknowledge) if
the same command was sent, however writing actual bytes to the DRV2605L is not a
problem. The bus acts as an
AND bus and logic zero takes priority.
Table 9 lists examples of the I
2
C transactions that are required to play a triple click (100%) waveform
using driver 1 in LRA, closed-loop mode. The yellow highlighted rows indicate auto-calibration mode and
obtaining the results for the auto-calibration compensation and back-EMF results (if required to be
performed for the first time).
Table 9. I
2
C Transaction Example of Playing a Triple Click Waveform Using Driver1 in LRA, Closed
Loop mode
SLAVE
DEVICE ADDRESS REGISTER VALUE DESCRIPTION I
2
C ACTION
(7-BIT)
1 Write TCA9554 0x20 0x03 0xFE Configures IO expander for output port at channel 1
2 Write TCA9554 0x20 0x01 0x01 Sends a high signal to output channel 1
3 Write TCA9548A 0x70 N/A 0x01
Configures I
2
C switch to connect channel 1 I
2
C lines
4 Write DRV2605L 0x5A 0x16 0x53 Set rated voltage (2 V
RMS
)
5 Write DRV2605L 0x5A 0x17 0xA4 Set overdrive clamp voltage (3.6-V peak)
6 Write DRV2605L 0x5A 0x01 0x07 Change mode to AutoCalibration
7 Write DRV2605L 0x5A 0x1E 0x20 Set AutoCalTime to 500 ms
8 Write DRV2605L 0x5A 0x0C 0x01 Set GO Bit
9 Read DRV2605L 0x5A 0x0C Poll GO Bit until it clears t0
12 Write DRV2605L 0x5A 0x1A 0xB6 Set feedback control register
13 Write DRV2605L 0x5A 0x1B 0x93 Set control 1 register
14 Write DRV2605L 0x5A 0x1C 0xF5 Set control 2 register
15 Write DRV2605L 0x5A 0x1D 0x80 Set control 3 register
16 Write DRV2605L 0x5A 0x01 0x00 Set mode to internal trigger
17 Write DRV2605L 0x5A 0x04 0x0C Set waveform sequence 1 as triple-click waveform
18 Write DRV2605L 0x5A 0x05 0x00 Indicator that there is only one waveform that
should be played
19 Write DRV2605L 0x5A 0x0C 0x01 Set GO bit
20 Read DRV2605L 0x5A 0x0C Poll GO bit until it clears to 0
21 Write TCA9554 0x20 0x00 0x00 Deassert the EN pin for driver 1
22 Write TCA9548A 0x70 N/A 0x00
No driver I
2
C channels connected
12 DRV2605L Multi-Driver ERM, LRA Haptic Driver Evaluation Kit User’s Guide SLOU400 – September 2014
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