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DRV5053: DRV5053 failure mode

Bill Wann
Prodigy 10 points
Part Number: DRV5053
Other Parts Discussed in Thread: DRV5023, DRV5023-Q1

In all possible failure modes for the DRV5053 is it possible for the devise to fail in either the open or closed mode.  I use the DRV5053 to detect that a lid is closed or open.  If the DRV5053 should fail, I would like it to always fail in the open mode then my product will not operate.    Thanks

  • 0
    TI__Mastermind 20985 points
    Hi Bill,

    It's difficult to answer your question, since this device should never fail, and we have not seen any field failures. The device's analog output can drive between 0V to 2V.

    However, if the external wiring or solder caused a short to the output, the output would go to VCC or GND. You can design your system so that VCC and GND are never valid voltages for the output; for example, when your lid is open, the magnet could be far away, and the DRV5053 will output VQ = 1V. When the lid is closed, the magnet could bring the output closer to 2V. In this case, you can know there's a short failure if the output is ever <0.3V or >2.3V (for example).

    Best regards,
    RE
  • 0 in reply to RE
    Prodigy 10 points
    Bill,

    I am in a very similar situation. I am working a new design and intend to use DRV5023 hall effect sensors to monitor a gear lock in an electro-mechanical actuator. My circuit needs to determine if the actuator is locked and in the correct position. I do not want to indicate the gear is locked if the sensor has failed. I want to put the sensor in my circuit such that a failed sensor will not give a locked signal. I was hoping to get some failure modes statistics for hall effect sensors. Has anyone come across any information that could help?
  • 0 in reply to BRIAN DORENKOTT
    TI__Mastermind 20985 points

    Hi Brian, it's common practice to use 2 sensors in parallel for redundancy. If their 2 outputs ever disagree, the controller will know there's a problem. With the DRV5023-Q1 we also made an inverse-output option (FI) for this type of application, since some designers would like unique voltages from each sensor to prevent a wire-to-wire short from going undetected.

    TI calculates the FIT rate of these devices here.

    Best regards,
    RE