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DRV5023-Q1: Urgent! DRV5023-Q1 function failure after low temperature aging test

Part Number: DRV5023-Q1
Other Parts Discussed in Thread: DRV5023

Hi Team,

We have one urgent case from customer side when using DRV5023AJQDBZRQ1 for magnet distance on/off detection. After -40C low temperature aging test for their product and recover to room temperature, the DRV5023 output is always keeping HIGH no matter the magnet is near by or far away. But after powering off and on again for DRV5023 VCC, it will output LOW with magnet nearby correctly. Then remove magnet and put it nearby again, it still keeps HIGH for the output, only by toggling the VCC can reset it one time for correct output behavior.

Customer is following datasheet schematic as below and VCC=5V, please help to check what's the possible reason for this failure behavior as your earlier as possible.

Thanks a lot!

  • Hello Jacky,

    Our device should survive -40C according to datasheet specifications.  Perhaps though the failure could be due to impurities in condensation.  My hypothesis is that when the board is subjected to -40C, if there is humidity, some vapor will transform to a layer of frost coating the surface of the device.  After the device is removed from the cold chamber some further water in the air will likely freeze on the surface.  After sufficient heat from the surrounding dissipates back into the device and board, this frost will melt.  During the period of time there is some of this liquid on the surface, if the board is not clean (has impurities) and gets powered on, you might have conductive path shorting pins that are not meant to be shorted together resulting in some pins experiencing voltage potentials that might damage them. 

    If this is the case, perhaps thoroughly cleaning the boards, then possibly baking them to help remove any residual impurities might help prior to the tests.  Also applying some non-conductive coating to the surface of the device might help prevent pins from being exposed to any liquid from condensation and thereby prevent the above scenario I described.