ZHCSHJ5 December 2018 DRV5021
PRODUCTION DATA.
7.3.3 Power-On Time
After applying VCC to the DRV5021, ton must elapse before the OUT pin is valid. In case 1 (Figure 13) and case 2 (Figure 14), the output is defined assuming that magnetic field BAPPLIED > BOP, and BAPPLIED < BRP, respectively.
Figure 13. Case 1: Power On When B > BOP 
Figure 14. Case 2: Power On When B < BRP If the device is powered on with BRP < BAPPLIED < BOP, then the device output remains in indeterminate state until the magnetic field changes. After the change in magnetic field results in a condition that meets either BOP < BAPPLIED or BRP > BAPPLIED, the output turns to valid state after td time elapses. Case 3 (Figure 15) and case 4 (Figure 16) show examples of this behavior.
Figure 15. Case 3: Power On When BRP < B < BOP, Followed by B > BOP 
Figure 16. Case 4: Power On When BRP < B < BOP, Followed by B < BRP