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Using DRV 2605 or similar chips to drive multiple LRA actuators

Alan Cyrus
Prodigy 20 points
Other Parts Discussed in Thread: DRV2625, DRV2605, DRV2605LEVM-MD, DRV2605L

Hello E2E forum,

I am working a University project where we would like to use 6 to 8 LRA actuators to create haptic feedback. I found the DRV 2605 chip as a potential solution for driving these LRA motors. My question is whether there is a single chip that can drive multiple actuators (using the Immersion Touchsense 2200 software that has the audio-to-vibe features and that is lisenced to the DRV 2605, for example) or if using multiple DRV 2605 chips is the way to address the issue.

Thanks for your help

  • 0
    TI__Intellectual 945 points
    Hello Allan,

    The DRV2605 measures the back-EMF when driving any given actuator in order to run the Automatic Level Calibration. Connecting more than one actuator may create some interference in terms of more than one back-EMF will be connected in parallel as seen from the device. We have tested driving up to 2 LRA actuators using a single device (DRV2625), in open-loop mode, and obtained good results. However, I would imangine things would get complicated connecting those 6 to 8.

    I you want to go ahead and try it, make sure your power supply can provide enough current.

    Our DRV2605LEVM-MD drives up to 8 LRAS using 8 different devices, so I would recommend you give that a look.

    Please, let me know if you have any further questions,
    Leo
  • 0 in reply to Leo Rodriguez
    Prodigy 20 points
    Hi Leo, thanks for your help. I have a couple of follow up questions for you. For the DRV2605LEVM-MD, which type of connection is that for the 8 device attachments? Also, can you control the intensity of the vibrations in the audio-to-vibe mode in a way that is independent of the volume of the audio itself? Moreover, what types of vibration modes does audio-to-vibe offer?
  • 0 in reply to Alan Cyrus
    TI__Expert 8940 points

    Hi, Alan:

    the 8 DRV2605Ls are connected to MCU via I2C switch.

    each DRV2605L can be controlled independently.

    but Audio-to-Vibe vibration is tightly related to the audio volume. this is a technology from Immersion.