After applying V_CC to the DRV5013 device, t_on must elapse before the OUT pin is valid. During the power-up sequence, the output is Hi-Z. A pulse as shown in Figure 6-4 and Figure 6-5 occurs at the end of t_on. This pulse can allow the host processor to determine when the DRV5013 output is valid after start-up. The power-up sequence, including the pulse, is the same for all device output versions (AD, AG, BC, FA, ND). Case 1, 2, 3 and 4 below show examples of valid outputs for the non-inverted output versions (AD, AG, BC, FA). In Case 1 (Figure 6-4) and Case 2 (Figure 6-5), the output is defined assuming a constant magnetic flux density B > B_OP and B < B_RP.

Figure 6-4 Case 1: Power On When B > B_OP

Figure 6-5 Case 2: Power On When B < B_RP

If the device is powered on with the magnetic flux density B_RP < B < B_OP, then the device output is indeterminate and can either be Hi-Z or pulled low. During the power-up sequence, the output is held Hi-Z until t_on has elapsed. At the end of t_on, a pulse is given on the OUT pin to indicate that t_on has elapsed. After t_on, if the magnetic flux density changes such that B_OP < B, the output is released. Case 3 (Figure 6-6) and Case 4 (Figure 6-7) show examples of this behavior.

Figure 6-6 Case 3: Power On When B_RP < B < B_OP, Followed by B > B_OP

Figure 6-7 Case 4: Power On When B_RP < B < B_OP, Followed by B < B_RP