Texas Instruments DRV2605LEVM-MD, User Manual

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Power Supply Selection
7 Power Supply Selection
The DRV2605LEVM-MD can be powered by USB or an external power supply (VBAT). Jumpers DRV and
MSP are used to select USB or VBAT for the DRV2605L and MSP430F5510 devices, respectively.
Table 8 lists the different supply configurations and supply voltages that the DRV2605L devices and
MSP430 device could have.
Figure 11. Power Jumper Selection
Table 8. Power Jumper Selection Options
SUPPLY CONFIGURATION DRV MSP DRV2605L SUPPLY VOLTAGE
USB – both USB USB 5-V USB
DRV2605L external supply, MSP430 USB VBAT USB VBAT
DRV2605L USB, MSP430 external supply USB VBAT 5-V USB
External Supply - both VBAT VBAT VBAT
Because USB protocol allows for 500 mA per port, a conservative estimate allows two to three actuators
and drivers to be operated with USB power (150 to 200 mA worst case per driver or actuator, depending
on the actuator). If more actuators are required, use the VBAT terminal to ensure adequate power for the
entire system.
8 Typical Usage Examples
8.1 Play a Waveform or Waveform Sequence from ROM Memory
1. Configure the TCA9554 channels as output ports and enable the appropriate DRV2605L devices by
asserting the output pin (logic high).
2. Configure the TCA9548A device to select the appropriate channel that is connected to the desired
DRV2605L I
2
C data and clock lines.
3. Initialize the DRV2605L device as listed in the Initialization Procedure section of the DRV2605L
datasheet, .
4. Select the desired MODE[2:0] bit value of 0 (internal trigger), 1 (external edge trigger), or 2 (external
level trigger) in the MODE register (address 0x01). If the STANDBY bit was previously asserted then it
should be de-asserted (logic low) at this time. If register 0x01 already holds the desired value and the
STANDBY bit is low, the user can skip this step.
5. Select the waveform index to be played and write it to address 0x04. Alternatively, a sequence of
waveform indices can be written to register 0x04 through 0x0B. See the Waveform Sequencer section
of the DRV2605L data sheet for details.
11 SLOU400 – September 2014 DRV2605L Multi-Driver ERM, LRA Haptic Driver Evaluation Kit User’s Guide
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