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DRV201: DRV201YFMR

SREERAM R
Prodigy 20 points
Part Number: DRV201

Dear TI tech team,

Greetings of the day!

We have used DRV201YFMR VCM driver chip in our hardware design. While working with it, we are able to observe that the DRV201YFMR chip is not functioning after performing three power cycles (Switching off and on of the circuit) to our board. However, it is working again if we power it on after 30 minutes but the scenario of working only three times remains the same. This case is observed in our entire build. Can you kindly help with this?

Also, in the datasheet it is mentioned to have 500K pull-down resistor for SCL line. What is the typical reason for it? I have also attached the reference schematics for your reference.

Thanks,

Sreeram R

  • 0
    TI__Guru 54665 points

    Sreeram,

    The 500k is a spec for the INTERNAL pull-down resistance on this line.  It is not a recommendation for external circuit.

    Are you sure the device is not going into a STANDBY state?  You can see the conditions for that in the datasheet.  

    Are you able to read back any faults when the driver stops working?

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    Prodigy 20 points

    Hi Ryan Kehr,

    Good day!

    We also checked the functionality of this lens driver without 500K pull-down in SCL line. While trying for power cycle in that case (i.e., Power off and on) the driver IC was working properly for the first time. However, when we perform power cycle for the second time, the driver IC was not working. However, it is working again if we power it on after 30 minutes but the scenario of working only one time remains the same.

    Thanks,

    Sreeram R

  • 0 in reply to SREERAM R
    TI__Guru 54665 points

    Sreeram,

    Are you able to share scope captures of the supply cycling?  I want to check timing.

    Also, any faults can be read back from the device?

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    Prodigy 20 points

    Hi Ryan,

    When we probe the I2c signal in driver circuit after one power cycle, there is no acknowledgement from lens driver IC to MCU.

    But, when powered on initially, there is acknowledgement from lens driver IC to MCU part.

    Thanks,

    Sreeram R

  • 0 in reply to SREERAM R
    TI__Guru 54665 points

    Sreeram,

    I am thinking there is still something wrong with the power-up sequence and device is stuck in SHUTDOWN state or STANDY.  Please see diagram below from datasheet.  

    Can you please check that everything is being correctly followed with the timing on the power cycle?

    Regards,

    Ryan