• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 259 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV2605L: Open-loop mode issue

Remi F.
Prodigy 10 points
Part Number: DRV2605L

Hello,

We are using the DRV2605L in our product, we decided to switch to an LRA requiring open-loop operation. We are only using RTP mode.

I am however having trouble to make it work properly. I switch to demo boards to make it easier to debug (2305 Adafruit) and I get some very surprising results:

  • When using one of the demo board (Adafruit 2305), everything works as intended, I can drive the LRA in open-loop.
  • when using a second demo board (still Adafruit 2305 but different physical board), with the same software, then the DRV2605L only runs in close-loop.

Any idea what could be the issue here?

Thank you in advance,

Rémi

  • 0
    TI__Mastermind 18080 points

    Hi Rémi,

    There is a register that sets closed loop or open loop operation, LRA_OPEN_LOOP, which is in Control3 (Address: 0x1D). More information on this register is in section 8.6.23 in the datasheet. I recommend looking here first to confirm the mode of operation. 

    Regards,
    Sydney Northcutt