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TMAG5328: Behavior when performing operations that exceed the specifications of TMAG5328

Conor
Guru 12165 points
Part Number: TMAG5328

Hi,

I have a question regarding the operation of TMAG5328.

Q1
The data sheet contains the following information.

---
Operating above and beyond those limits is not recommended and can result in either getting the
wrong threshold set or locking up the device into a specific state without the possibility of exiting.
---

It seems that if Bop is incorrectly set to a non-standard value, threshold errors and locking may occur. I have confirmed that it is possible to reset the settings in the case of a threshold error, but there is no mention of locking. Please tell me how to return.


Q2.
Please tell me about the behavior of the IC if an excessive magnetic flux exceeding 14 mT is accidentally applied. I am concerned about the possibility of damage or errors.

Thanks,

Conor

  • 0
    TI__Expert 7950 points

    Hi Conor,

    Thanks for posting to the sensors forum.

    Conor said:
    It seems that if Bop is incorrectly set to a non-standard value, threshold errors and locking may occur. I have confirmed that it is possible to reset the settings in the case of a threshold error, but there is no mention of locking. Please tell me how to return.

    The statement you are referencing is saying that the RADJ should be set between 2kOhm and 15kOhm (or VADJ between 160mV and 1200mV) to ensure the thresholds are set properly. If these limits are exceeded, the thresholds may not be set properly, or the device may be stuck in a high or low state. 

    Conor said:
    Q2.
    Please tell me about the behavior of the IC if an excessive magnetic flux exceeding 14 mT is accidentally applied. I am concerned about the possibility of damage or errors.

    The TMAG5328 will not be damaged by excessive magnetic fields, as shown in the Absolute Maximum Ratings (Magnetic Flux Density, BMAX).

    Best regards,

    Jesse

  • 0 in reply to Jesse Baker
    Guru 12165 points

    Hi Jesse,

    Thank you for your reply.

    Jesse Baker said:
    If these limits are exceeded, the thresholds may not be set properly, or the device may be stuck in a high or low state. 

    If the device is stuck, the only way to recover is to restart, right?

    Thanks,

    Conor

  • 0 in reply to Conor
    TI__Expert 7950 points

    Hi Conor,

    I have reached out internally for further clarification on this point and will update the thread when I have a response.

    Best regards,

    Jesse

  • 0 in reply to Conor
    TI__Expert 7950 points

    Conor,

    If the thresholds are improperly due to an invalid Radj/Vadj resulting in abnormal operation, the device should return to normal operation once the ADJ pin voltage is in the expected range.

    Best regards,

    Jesse

  • 0 in reply to Jesse Baker
    Guru 12165 points

    Hi Jesse,

    Thank you for your reply.

    Am I correct in my understanding that "locking up" is released when the ADJ pin voltage range returns to the recommended operating voltage (~1200mV)?

    I would like to know what "locking up" in the data sheet means.

    Thanks,

    Conor

  • 0 in reply to Conor
    TI__Expert 7950 points

    Hey Conor,
    Yes, your understanding is correct  
    The “locking up” comment is referring to situations like when Radj=0. This prevents the device from operating normally since the thresholds would be 0. Power cycling the device will not fix the problem in this case—the ADJ pin voltage has to return to the expected voltage range to return to normal operation.
    Best regards,
    Jesse