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| 型號： | OV7620 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | OV7620 SINGLE-CHIP CMOS VGA COLOR DIGITAL CAMERA |
| 中文描述： | OV7620的單芯片CMOS VGA彩色數(shù)碼相機 |
| 文件頁數(shù)： | 9/60頁 |
| 文件大?。?/td> | 313K |
| 代理商： | OV7620 |
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OV7620 Product Specifications - Rev. 1.2 (5/13/00)
OMNIVISION TECHNOLOGIES INC.
9
Preliminary
Company Confidential
To decrease data transfer rate while high resolution image unnecessary, OV7620 provide a so-
lution, that is it can output
QVGA
resolution image. This mode decrease pixel rate one half. The
resolution default value is 320x240 and can be programmable. Every line only output one half
data. For Interlaced Mode, all field line output (320), for Progressive Scan Mode, only one half
line data output.
The digital video port also offer
RGB Raw Data
16 Bit/8 Bit format. The output sequence is
matched to OV7620 Color Filter Pattern, that is UV channel output sequence is G R G R ..., Y
Channel output sequence is B G B G,....To 8 Bit RGB Raw data output format, just use Y channel
and disable UV channel, output sequence is B G R G ....
OV7620 support
CCIR656
YCrCb 4:2:2 digital output format. The
SAV
(Start of Active Video) and
EAV
(End of Active Video) is just at the beginning and the end of
HREF
window. So the position
of
SAV
and
EAV
is changing with active pixel window. Also you can get 8 bit
RGB raw data
with
SAV
and
EAV
information.
OV7620 support some flexible YUV output format. One is standard YUV 4:2:2. Another is U V
sequence swap format, that means UV channel output V U V U ...(16 Bit) and V Y U Y ...(8 Bit).
The 3rd format is Y/UV sequence swap in 8 Bit output, that is Y U Y V ....
OV7620 can be use as
black
&
white
camera. At this mode, it’s vertical resolution will be higher
than color mode. All data will be output from Y port and UV port will be tri-state. Data (Y/RGB)
output rate is same as 16 Bit mode.
OV7620 can be programmable to swap Y/UV or RGB output byte MSB and LSB. Y7 - Y0 default
sequence is Y7 is MSB and Y0 is LSB. When swap, Y7 is LSB and Y0 is MSB, relative middle
bits are swapped.
An important factor about digital camera is how convenient the interface is, OV7620 has made
the frame rate programmable and the A/D synchronous to the actual pixel rate. Essentially, it is
a whole image capture system in a single chip. Since the internal AEC has a range of 1:260, and
AGC have 24dB, for the most of applications, the camera can adjust itself to meet the lighting
condition without user intervention.
OV7620 support hardware/software RESET function: when
RESET
pin tie to high, whole chip
will be reset including all register. Hardware sleeping mode: when
PWDN
tie to high, chip clock
will be stop and internal circuit reset except all SCCB register. Also there is a SCCB control soft-
ware reset control register 12 bit 7, which is same as hardware
RESET
pin function.
OV7620 hardware reset time minimum is 1 ms.
OV7620 support hardware/software power saving mode. When the
PWDN
pin tie to high, whole
chip will be set to power down status without any current consumption. For software power down
control, all current set to zero except crystal circuit. In power down mode, all SCCB register value
will be kept.
Two control mechanism have been built into OV7620:
A
. one time read-in of pin states at
power
up
or
RESET
status, including hardware and software reset;
B
. SCCB interface. Two methods
are mutually exclusive, only one is used at a time, selected by pin
SBB
. Method A has limited
access to full chip features.
The power up reset method is a one time setting, the setting can not be altered later. The pins
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| OV7640 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:OV7640 Color CMOS VGA (640 x 480) CAMERACHIP OV7141 B&W CMOS VGA (640 x 480) CAMERACHIP |
| OV7648 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:COLOR | VGA | 640 x 480 | DIGITAL | CameraChip | TECHNICAL BULLETIN |
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