DLPS052 October 2015 DLPA3000
Both the Illumination driver and the Illumination LDO have a power good indication. The power good for the driver indicates if the output voltage (VLED) is within a defined window indicating that the LED current has reached the set point. If, for some reason, the LED current cannot be controlled to the intended value, this fault occurs. Subsequently, bit ILLUM_BC1_PG_FAULT in register 0x27 is set high. The illumination LDO output voltage is also monitored. When the power good of the LDO is asserted, it implies that the LDO voltage is below a pre-defined minimum of 80% (rising) or 60% (falling) edge. The power good indication for the LDO is in register 0x27 (V5V5_LDO_ILLUM_PG_FAULT).