Yuki,
Thanks for reaching out with your question.
The timing pattern for DRV5032 is pictured above. During the periods of high Icc, the device is active and integrating the Hall-effect response. For the rest of the cycle the device is idle and in a low power state. If the field necessary for a threshold detection is transitory and passes completely during the low period, then DRV5032 will not generate any response.
Additionally, the average field during the conversion cycle must exceed the BOP threshold. If the field were to peak above the threshold only for a small moment of the integration time, then it's likely this would be missed as well.
In order to detect such events, it would be recommended to use a device with a higher sample frequency. The trade-off to using a device with a higher sample rate will be an increase in supply current demand. Please review our portfolio of products in order to find a device that suits your application.
For instance, TMAG5123 is a new in-plane sensor which samples at 10 kHz and draws 3.5 mA and has Bop and Brp thresholds comparable to DRV5032.
Thanks,
Scott
