DLPA2000
ZHCSCO5B –JUNE 2014–REVISED FEBRUARY 2018
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Typical Projector Application (continued)
8.2.1 Design Requirements
A pico-projector is created by using a DLP chipset comprised of DLP2010 (0.2 WVGA) DMD, DLPC3430, or
DLPC3435 controller and DLPA2000 PMIC/LED driver. The DLPC3430 or DLPC3435 does the digital image
processing, the DLPA2000 provides the needed analog functions for the projector, and DMD is the display
device for producing the projected image.
In addition to the three DLP chips in the chipset, other chips may be needed. At a minimum, a flash part is
needed to store the software and firmware to control the DLPC3430 or DLPC3435.
The illumination light that is applied to the DMD is typically from red, green, and blue LEDs. These 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.
When connecting the DLPC3430 or DLPC3435 to the host processing to receive images, a parallel interface is
used. While using the parallel interface, I2C should be connected to the host processor for sending commands to
the DLPC3430 or DLPC3435.
The only power supplies needed external to the projector are the battery (SYSPWR) and a regulated 1.8-V
supply. The entire pico-projector can be turned on and off by using a single signal called PROJ_ON. When
PROJ_ON is high, the projector turns on and begins displaying images. When PROJ_ON is set low, the projector
turns off and draws just microamps of current on SYSPWR. 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. If PROJ_ON is low, the
DLPA2000 will not draw current on the 1.8-V supply.
8.2.2 Detailed Design Procedure
For connecting together the DLP2010, DLPC3430 or DLPC3435, and DLPA2000, see the reference design
schematic. When a circuit board layout is created from this schematic, a very small circuit board is possible. An
example small board layout is included in the reference design database. Layout guidelines should be followed to
achieve a reliable projector.
The optical engine that has the LED packages and the DMD mounted to it is typically supplied by an optical
OEM who specializes in designing optics for DLP projectors.
A miniature stepper motor can optionally be added to the optical engine for creating a motorized focus. Direct
control and driving of the motor can be done by the DLPA2000, and software commands sent over I2C to the
DLPC3430 or DLPC3435 are available to move the motor to the desired position.
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