SNVSBK2 September 2019 LP8733
The continuous (or invalid) mode of operation is selected by setting the PGOOD_MODE bit to 1 in the PGOOD_CTRL_2 register.
For the continuous mode of operation, PGOOD behaves as follows:
The PG_FAULT register bits are latched, and maintain the fault information until the host clears the fault bit by writing 1 to the bit. The PGOOD signal also indicates a thermal shutdown and input overvoltage interrupts, which are cleared by clearing the interrupt bits.
When the regulator voltage is transitioning from one target voltage to another, the PGOOD signal is set inactive.
When the PGOOD signal becomes inactive, the source for the fault can be read from the PG_FAULT register. If the invalid output voltage becomes valid again, then the PGOOD signal becomes active. Thus the PGOOD signal always shows if the monitored output voltages are valid. The block diagram for this operation is shown in Figure 18 and an example of operation is shown in Figure 19.
The PGOOD signal can also be configured so that it maintains an inactive state even when the monitored outputs are valid, but there are PG_FAULT_x bits in the PG_FAULT register pending clearance. This type of operation is selected by setting the PGFAULT_GATES_PGOOD bit to 1 in the PGOOD_CTRL_2 register.