A pico projector can be created by using the DLP chipset that includes the DLP2010 (.2 WVGA) DMD, the DLPC34xx controller, and the DLPAxxxx PMIC/LED driver. The DLPC34xx controller processes the digital images, the DLPAxxxx PMIC provides the analog functions for the chipset, and the DMD displays the image for projection.
In addition to the three DLP devices in the chipset, other components may be needed. At a minimum, a flash device is needed to store the firmware that controls the DLPC34xx controller.
The illumination light that is applied to the DMD is typically from red, green, and blue LEDs. These LEDs are often contained in three separate packages, but sometimes more than one color of LED die may be in the same package to reduce the overall size of the pico projector.
To receive images, connect the DLPC34xx controller to the host processor using the parallel (or potentially DSI) interface. To send commands to the controller, connect it to the host processor using the I2C interface.
The only required power supplies that are external to the projector system chipset are the battery (SYSPWR) and possibly a regulated 1.8-V supply (some TI PMICs generate the 1.8-V supply but the DLPA200x does not).
The entire projector chipset can be turned on and off by using a single signal called PROJ_ON. When PROJ_ON is high, the chipset turns on and can begin displaying images. When PROJ_ON is set low, the projector chipset turns off and draws just microamps of current on SYSPWR. If 1.8 V is supplied separately from the PMIC (as is the case with the DLPA200x), when PROJ_ON is set low, the 1.8 V supply can continue to be left at 1.8 V and used by other non-projector sections of the product.