MT9V403 datasheet(5/33 Pages) MICRON

5 / 33 page

1/2-INCH VGA (WITH FREEZE-FRAME) CMOS

ACTIVE-PIXEL DIGITAL IMAGE SENSOR

09005aef80c07280

Micron Technology, Inc., reserves the right to change products or specifications without notice.

MT9V403_DS.fm - Rev. B 1/04 EN

Figure 5: Master Mode Row Timing Diagram

NOTE:

Horizontal blanking is nominally 35 rows, and may be increased using register 5.

In master mode the frame rate is controlled by

inserting vertical and/or horizontal blanking periods

during readout, or by changing the input master clock

(SYSCLK) frequency (i.e., slowing the sensor down), or

by changing the number of rows being readout (i.e.,

window size). Table 2 shows some examples of how the

frame rate changes with window resolution and clock

speed.

Table 2:

Frame Rate vs. Resolution and Clock Speed

No blanking, exposure < readout

When

horizontal

blanking

utilized,

the

ROW_VALID stays LOW for an additional user-pro-

grammable number of clock cycles after each row

readout. As a result the row time becomes:

RT = (1 + 66 6+ 4 + HB) x (1/fsysclk)

where HB is the horizontal blanking in SYSCLK

cycles (255 clock maximum) specified in register 5.

When vertical blanking is utilized, the FRAME_

VALID signal stays LOW for an additional user pro-

grammable number of rows after the frame is readout

(if exposure time < readout time) or exposed (if expo-

sure time > readout time). Table 3 on page 6 shows the

various scenarios for calculating the frame time, where

VB is the vertical blanking in rows (255 rows maxi-

mum) specified in register 6. The default vertical

blanking is one SYSCLK cycle, so the true vertical

blanking time is the number of blanking rows pro-

grammed plus one clock cycle.

Horizontal Blanking

SYSCLK

(input)

ROW _VALID

(output)

DATA [9:0]

(output)

XXX

653

671

169

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

648

649

910

(

)

(

)

652

RESOLUTION (# ROWS)

CLOCK SPEED (SYSCLK)

FRAME RATE (FRAMES/SECOND)

502 (full resolution)

66 MHz

196

251

66 MHz

392

125

66 MHz

784

66 MHz

1568

502 (full resolution)

24 MHz

251

24MHz

140

125

24 MHz

280

24 MHz

560

502 (full resolution)

10 MHz

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