SYSPWR is the main supply of the DLPA3000. It can range from 6 V to 20 V, where the typical is 12 V. At power-up, several (internal) power supplies are started one after the other to make the system work correctly (Figure 8-1). A sequential startup provides that all the different blocks start in a certain order and prevent excessive startup currents. The main control to start the DLPA3000 is the control pin PROJ_ON. Once set high, the basic analog circuitry is started, which is needed to operate the digital and SPI interface. This circuitry is supplied by two LDO regulators that generate 2.5 V (SUP_2P5V) and 5 V (SUP_5P0V). These regulator voltages are for internal use only and not loaded by an external application. The output capacitors of those LDOs must be 2.2 µF for the 2.5 V LDO and 4.7 µF for the 5 V LDO, pin 91 and 92, respectively. Once these are up the digital core is started, and the DLPA3000 Digital State Machine (DSM) takes over.

Subsequently, the 5.5 V LDOs for various blocks are started: PWR_5V5V, DRST_5P5V and ILLUM_5P5V. Next, the buck converters and DMD LDOs are started (PWR_1 to PWR_4). The DLPA3000 is now awake and ready to be controlled by the DLPC (indicated by RESET_Z going high).

Lastly, the general purpose buck converters (PWR_6) can be started (if used) as well as the regulator that supplies the DMD. The DMD regulator generates the timing critical VOFFSET, VBIAS, and VRESET supplies.

1. Arrows indicate sequence of events automatically controlled by digital state machine. Other events are initiated under SPI control.
2. SUP_5P0V and SUP_2P5V rise to a precharge level with SYSPWR, and reach the full level potential after PROJ_ON is pulled high.

Figure 8-1 Powerup Timing