DLPC900ZPC datasheet(39/72 Pages) TI1

39 / 72 page

DLPC900

www.ti.com

DLPS037A – OCTOBER 2014 – REVISED AUGUST 2015

Device Functional Modes (continued)

To synchronize a camera to the displayed patterns, the DLPC900 controller supports two pattern modes: Video

pattern and Pre-stored pattern modes. In video pattern mode, the vertical sync is used as trigger input. In pre-

stored pattern mode, an internal user configurable trigger or a TRIG_IN_1 pulse indicates to the DLPC900

controller to advance to the next pattern, while TRIG_IN_2 starts and stops the pattern sequence. In both pattern

modes, TRIG_OUT_1 frames the exposure time of the pattern, while TRIG_OUT_2 indicates the start of the

pattern sequence.

Figure 17 shows an example of a video pattern mode. The VSYNC starts the pattern sequence display. The

pattern sequence consists of a series of four patterns followed by a series of three patterns and then repeats.

The first pattern sequence consists of P1, P2, P3, and P4. The second pattern sequence consists of P5, P6, and

P7. TRIG_OUT_1 frames each pattern exposed, while TRIG_OUT_2 indicates the start of each pattern in the

sequence. If the pattern sequence is configured without dark time between patterns, then the TRIG_OUT_1

output would be high for the entire pattern sequence.

Figure 17. Video Pattern Mode Timing Diagram

Figure 18 shows an example of a pre-stored pattern mode. Pattern sequences of four are displayed.

TRIG_OUT_1 frames each pattern exposed, while TRIG_OUT_2 indicates the start of each pattern in the

sequence. If the pattern sequence is configured without dark time between patterns, then the TRIG_OUT_1

output would be high for the entire pattern sequence.

Figure 18. Pre-Stored Pattern Mode Timing Diagram

Another example of a pre-stored pattern mode is shown in Figure 19, where pattern sequences of three are

displayed. TRIG_OUT_1 frames each pattern displayed, while TRIG_OUT_2 indicates the start of each pattern.

TRIG_IN_2 serves as a start and stop signal. When high, the pattern sequence starts or continues. Note, in the

middle of displaying the P4 pattern, TRIG_IN_2 is low, so the sequence stops displaying P4. When TRIG_IN_2 is

raised, the pattern sequence continues where it stopped by re-displaying P4.

Figure 19. Pre-Stored Pattern Mode Timing Diagram for 3-Patterns

Submit Documentation Feedback

Product Folder Links: DLPC900

DLPC900ZPC Datasheet(PDF) 39 Page - Texas Instruments