DLPC3470 datasheet(32/70 Pages) TI1

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DLPC3470

DLPS110 – APRIL 2018

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8.3 Feature Description

8.3.1 Pattern Display

Pattern display is one of the key capabilities of the DLPC3470 display and light controller. When the DLPC3470

controller is configured for pattern display, video processing functions can be bypassed to allow for accurate

pattern display. For user flexibility and simple system design the DLPC3470 controller supports both external

pattern and internal pattern streaming modes. In external pattern streaming mode, patterns are sent to the

DLPC3470 controller over parallel interface. In internal pattern streaming mode, 1D patterns are pre-loaded in

flash memory and a host command is sent to DLPC3470 controller to display the patterns. Internal pattern mode

allows for a simple system design by eliminating the need for any external processor to generate and sent 1D

patterns to the DLPC3470 controller.

The DLPC3470 controller outputs two configurable Trigger Out signals and one external trigger signal to

synchronize patterns with a camera, sensor, or other peripherals.

Table 3. Pattern Display Signals

SIGNAL NAME

DESCRIPTION

TRIG_OUT_1

External Pattern Mode: Active during each input frame.

Internal Pattern Mode: Active during a predefined group of patterns.

TRIG_OUT_2

Active during display of each pattern.

TRIG_In

Active in Internal Pattern Display mode only. External trigger signal is used to advance to next patterns

in internal pattern mode.

8.3.1.1 External Pattern Mode

External pattern mode supports 8-bit and 1-bit monochrome or RGB patterns.

8.3.1.1.1

8-bit Monochrome Patterns

In 8-bit external pattern mode, the DLPC3470 controller supports up to 120-Hz input frame rate (VSYNC). In this

mode, the 24-bit input data sent over the parallel interface can be configured as a combination of 1 (8-bits), 2

(16-bits), or 3 (24-bits) 8-bit patterns. Equation 1 calculates the maximum pattern rate for 8-bit pattern.

150 Hz × 3 = 450 Hz

where

•

the maximum allowed input frame rate is 150 Hz

(1)

The DLPC3470 controller firmware allows for the following user programmability.

•

Exposure time: Time during which a pattern is displayed

•

Dark time: Time during which no pattern is displayed and the illumination is OFF

•

Number of 8-bit patterns within a frame: 1, 2 or 3

•

Illuminator: Illuminator that will be ON for each 8-bit pattern

•

Trigger: TRIG_OUT_1 and TRIG_OUT_2 signal configuration and delay

Figure 15 shows a configuration with 3 × 8-bit patterns

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