OV2640 datasheet(4/43 Pages) OMNIVISION

4 / 43 page

Proprietary to OmniVision Technologies

Version 1.6, February 28, 2006

OV2640

Color CMOS UXGA (2.0 MegaPixel) OmniPixel2™ CAMERACHIP™

Omni ision

Figure 4 Windowing

Zooming and Panning Mode

The OV2640 provides zooming and panning modes. The

user can select this mode under SVGA/CIF mode timing.

The related zoom ratios will be 2:1 of UXGA for SVGA and

4:1 of UXGA for CIF. Registers ZOOMS[7:0] (0x49) and

COM19[1:0] (0x48) define the vertical line start point.

point.

Sub-sampling Mode

The OV2640 supports two sub-sampling modes. Each

sub-sampling mode has different resolution and maximum

frame rate. These modes are described in the following

sections.

SVGA mode

The OV2640 can be programmed to output 800 x 600

(SVGA) sized images for applications where higher

resolution image capture is not required. In this mode,

both horizontal and vertical pixels will be sub-sampled

with an aspect ratio of 4:2 as shown in Figure 5.

Figure 5 SVGA Sub-Sampling Mode

Column

End

Sensor Array

Boundary

HREF

Column

Display

Window

Column

Start

Row Start

Row End

n+1

n+2

n+3

n+4

n+5

n+6

n+7

Column

Row

Skipped Pixels

CIF Mode

The OV2640 can also operate at a higher frame rate to

output 400 x 296 sized images. Figure 6 shows

the

sub-sampling diagram in both horizontal and vertical

directions for CIF mode.

Figure 6 CIF Sub-Sampling Mode

Timing Generator and Control Logic

In general, the timing generator controls the following:

•

Frame Exposure Mode Timing

•

Frame Rate Adjust

•

Frame Rate Timing

Frame Exposure Mode Timing

The OV2640 supports frame exposure mode. Typically,

the frame exposure mode must work with the aid of an

external shutter.

The frame exposure pin, FREX (pin B2), is the frame

exposure mode enable pin and the EXPST_B pin (pin A2)

serves as the sensor's exposure start trigger. When the

external master device asserts the FREX pin high, the

sensor array is quickly pre-charged and stays in reset

mode until the EXPST_B pin goes low (sensor exposure

time can be defined as the period between EXPST_B low

and shutter close). After the FREX pin is pulled low, the

video data stream is then clocked to the output port in a

line-by-line manner. After completing one frame of data

n+1

n+2

n+3

n+4

n+5

n+6

n+7

n+8

n+9

n+10

n+11

n+12

n+13

n+14

n+15

n+16

n+17

n+18

n+19

n+20

n+21

n+22

n+23

Column

Row

Skipped Pixels

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