The stator current is converted to a voltage by inserting a ground−referenced sense resistor RS
(Figure 35) in series with the three bottom switch transistorsv(Q4, Q5, Q6). The voltage developed across the sense resistor is monitored by the current sense input (Pin 12), and compared to the internal 100 mV reference. If the current sense threshold is exceeded, the comparator resets the lower latch and terminates output switch conduction. The value for the sense resistor is: