ZHCSH31B August 2017 – February 2018 DRV10987
Note that the FG output reflects the driving state of the motor. During normal closed-loop behavior, the driving state and the actual state of the motor are synchronized. During open-loop acceleration, however, this may not reflect the actual motor speed. During a locked-motor condition, the FG output is driven high.
The DRV10987 device provides three options for controlling the FG output during open loop, as shown in Figure 43. The selection of these options is determined by the FGOLSel[1:0] setting.