In IO_MODE 0, 1 and 3, a pulse number diagnostic is active after start of burst (not when the burst is enabled) to monitor if the correct number of pulses (as set in BURST_PULSE) were generated before the end of burst was signaled through SPI or the IO1 pin. A fault, if detected, is then reported through the PULSE_NUM_FLT bit.

The pulse duration after start of burst (not when the burst is enabled) is monitored to detect a stuck condition, which will keep the FETs on OUTA or OUTB turned on. This can happen because of loss of external clock or the driving signal on IO1 and IO2 pins being stuck in one state. The device expects to see a toggle on IOx pins (based on IO_MODE) within the time period as defined in the DRV_PLS_FLT_DT register. If this diagnostic triggers, it will force an end of burst. The fault is reported by setting the DRV_PULSE_FLT bit. If a DRV_PULSE_FLT is set in IO_MODE 0, 1 and 3—and the programmed number of pulses were not sent before end of burst—the PULSE_NUM_FLT will also be set.