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DRV2603EVM-CT: ERM/LRA pin control

Edgar Lin2
Prodigy 210 points
Part Number: DRV2603EVM-CT
Other Parts Discussed in Thread: DRV2603

Tool/software:

Hi 

We are testing the LRA with the DRV2603 EVM.

We selected Mode 1 and used Button B2 for testing.

The test results met our expectations, but I noticed that the voltage on the LRA/ERM pin is 0V.

I expected it to be 3.3V or higher. Could you help explain this?

Thanks,

Edgar

  • 0
    TI__Expert 3560 points

    Edgar, 

    Thanks for reaching out. You said the test results met the expectations, so I assume that you can feel the vibration with Mode 1 and Button B2 during your testing. Do you mean the differential voltage between the two LRA terminals  is 0V when it is vibrating? Note that ERM will not vibrate for Mode 1 and Button B2 so the voltage between the ERM two terminals should be 0V. 

    Thanks

    Hailong

  • 0 in reply to Hailong Chen
    Prodigy 210 points

    Hi Hailong

    I mean is 

    When I selected Mode 1 B2 for testing, I observed that the voltage for LRA/ERM was 0V, instead of the expected 3.3V.

    0V should be for ERM, not for LRA.

    Coudl you help to check this.

     

    Edgar

  • 0 in reply to Edgar Lin2
    TI__Expert 3560 points

    Edgar, I checked this one and was able to repeat your observation. This seems a firmware issue that the LRA/ERM Pin is set to LOW and the LRA still vibrates correctly for the specific mode. I also tested other modes and the LRA/ERM pin is set correctly. 

    To close the ticket since the details were discussed in the email chain.