DLP4710LCFQL datasheet(33/45 Pages) TI2

33 / 45 page

8.2.1 Design Requirements

A high-accuracy, 3D depth capture product is created by using a DLP chipset comprised of DLP4710LC DMD,

2xDLPC3479 controller and DLPA3000 PMIC/LED drive. The DLPC3479 simplifies the pattern generation, the

DLPA3000 provides the needed analog functions and DMD displays the required patterns for accurate 3D depth

capture. In addition to the three DLP devices in the chipset, other components may be required to complete the

application. Minimally, a flash component is required to store patterns, the software, and the firmware in order to

control the DLPC3479 controller. DLPC3479 controller supports any illumination source including IR light source

(LEDs or VCSEL), UV light source or visible light source (Red, Green or Blue LEDs or lasers).

To send commands from the host processor to the DLPC3479, connect the two via I2C. The only power supplies

needed for the DLP4710LC chipset is the input power (SYSPWR). All other needed supplies are being provided

by the DLPA3000 or DLPA3005 PMIC for this chipset. A single signal (PROJ_ON) controls the entire DLP

system power. When PROJ_ON is high, the DLP system turns on and when PROJ_ON is low, the DLPC3479

turns off and draws only a few microamperes of current on SYSPWR.

The TSTPT_2 pin on the master controller outputs a 25ns pulse width that should be connected to the 3DR

(input) pin of the slave controller. In case VCC_INTF is not set to 1.8V, a voltage translator is required. The

propagation delay between the rising edge of TSTPT_2 pin on the master controller and the VIH of 3DR (input)

pin on slave controller is recommended to be under 10ns.

8.2.2 Detailed Design Procedure

For connecting the two DLPC3479 controllers, the DLPA3000/DLPA3005, and the DLP4710LC DMD, 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 data base. 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.

8.2.3 Application Curve

As the LED currents that are driven time-sequentially through the red, green, and blue LEDs are increased,

the brightness of the projector increases. This increase is somewhat non-linear, and the curve for typical white

screen lumens changes with LED currents is as shown in Figure 8-2. For the LED currents shown, it’s assumed

that the same current amplitude is applied to the red, green, and blue LEDs.

SPACE

Figure 8-2. Luminance vs Current

www.ti.com

DLP4710LC

DLPS178C – MAY 2020 – REVISED JULY 2023

Submit Document Feedback

Product Folder Links: DLP4710LC

DLP4710LCFQL Datasheet(PDF) 33 Page - Texas Instruments