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Original question:

DRV5032: Is it possible to measure magnitude of magnetic flux with DRV5032 switch?

DRV5032: Buy 1,000 pieces, there are more than a dozen pieces of bad

Jian Xiule
Prodigy 260 points
Part Number: DRV5032

The model DRV5032FBDBZT, Customer purchased 1000 pieces, there are more than a dozen pieces of bad, we found after testing, when the magnet attracts it, it should be low level normally, but there is no response, in the same circuit environment after changing a piece, it can work normally.

Customer are very anxious waiting for the production line, please deal with it, thank you!

  • 0
    TI__Genius 16530 points

    Jian,

    It appears in the video that you are probing Vout which is pulled up to 1.778 V.  Can you confirm that the Vcc pin on these devices is also at 1.778V? Are VCC and the pull-up operating at the same voltage?  Also, only one pole of the magnet was presented to the sensor.  It would be best to attempt the test with both poles of the magnet to ensure the correct pole was presented to the sensor.

    For a second verification, it would also be good to attempt an A-B-A swap.  In this test, we remove the suspect device and replace it with a known good unit.  If proper functionality is confirmed with the known good device, we can then attempt to reinstall the original suspect device to rule out any soldering or connectivity issues. If the test fails with the known good unit, then there might be a possible broken connection somewhere on the PCB.

    Also, is it possible to measure the Vcc current? I understand this may be inaccessible, but this would provide better understanding of the system state.

    Thank you,

    Scott Bryson

  • 0 in reply to Scott Bryson
    TI__Prodigy 260 points

    Hi, Scott 

    the Vcc voltage is 1.778V. After custom replaced a new part on the PCB, it work normal. There is totally more than a dozen pieces have this issue so the PCB connection issue possibility should be low. 

    Thank You

    Sure Jian

  • 0 in reply to Jian Xiule
    TI__Genius 16530 points

    Jian,

    The A-B-A swap verification requires that the device be re-installed after removal.  Was this attempted? It is important to complete this test in order to fully rule out assembly failure.  

    Thank you,

    Scott