MT9V403 Micron, MT9V403 Datasheet - Page 5

• Manufacturer Part Number: MT9V403
• Description: 1/2-INCH VGA (WITH FREEZE-FRAME) CMOS ACTIVE-PIXEL DIGITAL IMAGE SENSOR
• Manufacturer: Micron

NOTE:
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
Table 2:
No blanking, exposure < readout
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:
cycles (255 clock maximum) specified in register 5.
VALID signal stays LOW for an additional user pro-
09005aef80c07280
MT9V403_DS.fm - Rev. B 1/04 EN
Horizontal blanking is nominally 35 rows, and may be increased using register 5.
In master mode the frame rate is controlled by
When
where HB is the horizontal blanking in SYSCLK
When vertical blanking is utilized, the FRAME_
RESOLUTION (# ROWS)
502 (full resolution)
502 (full resolution)
502 (full resolution)
RT = (1 + 66 6+ 4 + HB) x (1/fsysclk)
ROW _VALID
horizontal
DATA [9:0]
(output)
(output)
Frame Rate vs. Resolution and Clock Speed
SYSCLK
(input)
251
125
251
125
63
63
1
blanking
Figure 5: Master Mode Row Timing Diagram
(
XXX
)
(
)
12
9
is
10
utilized,
(
(
(
(
)
)
)
)
(
(
(
(
1/2-INCH VGA (WITH FREEZE-FRAME) CMOS
)
)
)
)
CLOCK SPEED (SYSCLK)
648
the
652
ACTIVE-PIXEL DIGITAL IMAGE SENSOR
66 MHz
649
66 MHz
66 MHz
66 MHz
24 MHz
24 MHz
24 MHz
10 MHz
24MHz
653
5
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.
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.
Micron Technology, Inc., reserves the right to change products or specifications without notice.
671
Horizontal Blanking
671
169
+
XXX
1
FRAME RATE (FRAMES/SECOND)
(
(
(
(
)
)
)
)
(
(
(
(
)
)
)
)
1568
196
392
784
140
280
560
70
30
12
9
©2004 Micron Technology. Inc.
10