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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DLPC3421 датащи(PDF) 41 Page - Texas Instruments |
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DLPC3421 датащи(HTML) 41 Page - Texas Instruments |
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41 / 63 page  8.2.1 Design Requirements A pico projector can be created by using the DLP chipset that includes the DLP160CP (0.16 nHD) 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. 8.2.2 Detailed Design Procedure For connecting the DLP160CP (0.16 nHD) DMD, DLPC34xx controller, and DLPAxxxx PMIC, see the reference design schematic and board layout TIDA-080002. When a circuit board layout is created from this schematic, a small circuit board is possible. Follow the layout guidelines to design a reliable projector. It is typical for an optical engine manufacturer to supply the optical engine that includes the LED packages and a mounted DMD. These manufacturers specialize in designing optics for DLP projectors. There exists production-ready optical modules, optical module manufacturers, and design houses. 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 shown in Figure 8-2. For the LED currents shown, it is assumed that the same current amplitude is applied to the red, green, and blue LEDs. The shape of the curve depends on the LED devices used as well as the LED system-level heat sink implementation. Current (mA) 0 100 200 300 400 500 600 700 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 D001 Figure 8-2. Typical Luminance vs Current www.ti.com DLPC3421 DLPS231 – OCTOBER 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 41 Product Folder Links: DLPC3421 |
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