ZHCSH31B August 2017 – February 2018 DRV10987
The lock-detection current-limit function provides a configurable threshold for limiting the current to prevent damage to the system. This is often tripped in the event of a sudden locked-rotor condition. The DRV10987 device continuously monitors the current in the low-side drivers as shown in Figure 34. If the current goes higher than the threshold configured by the HWiLimitThr[2:0] bits, then the DRV10987 device stops driving the motor by placing the output phases into a high-impedance state. The Lock0 bit is set and a lock condition is reported. The device retries after tLOCK_OFF.
Set the lock-detection current limit to a higher value than the software current limit.