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PDF OV7950 Data sheet ( Hoja de datos )
| Número de pieza | OV7950 | |
| Descripción | (OV7451 / OV7950) CMOS Analog NTSC CameraChip | |
| Fabricantes | OmniVision Technologies | |
| Logotipo |  |
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ision
®
Advanced Information
Preliminary Datasheet
OV7950/OV7451 CMOS Analog NTSC CAMERACHIPTM with OmniPixel® Technology
General Description
The OV7950 (color) and OV7451 (black & white) single
chip CMOS CAMERACHIPSTM are designed to provide a
high level of functionality for all applications requiring a
small footprint, low voltage, low power consumption and
high performance color or B&W video camera.
Both devices support NTSC composite video output and
can directly interface with a VCR TV monitor or other
device with 75 ohm loading.
Note: The OV7950/OV7451 is available
Pb in a lead-free package.
Features
• Single chip 1/4" format video camera
• Composite video (NTSC) output
• High sensitivity
• Automatic exposure/gain with 16 zone control
• Horizontal and vertical windowing capability
• Auto white balance control
• Aperture/Gamma correction
• 50/60 Hz flicker cancellation
• External frame sync capability (Genlock)
• SPI/EEPROM used to control overlay and set other
customer variables
• Two sets of dynamic overlay controls
• Master/slave compatible Serial Camera Control Bus
(SCCB) control interface for register programming
• Low power consumption
• Extreme low dark current for high temperature
applications
• Defective pixel correction
Ordering Information
Product
Package
OV07950-C10A (Color, NTSC)
CLCC-48
OV07451-C10A (B&W with microlens, NTSC) CLCC-48
Applications
• Security/Surveillance cameras
• Video Conferencing
• Video phones
• Video e-mail
• Toys
• Finger print equipment
• Medical and dental equipment
Key Specifications
Array Size
Analog/ADC/IO
Power Supply
Digital Core
Power Consumption
Image Area
Exposure
Time Range
OV7950
OV7451
Optical Format
S/N Ratio
Dynamic Range
Pixel Size
Dark Current
Fixed Pattern Noise
Package Dimensions
656 x 492
3.3 VDC + 5%
1.8 VDC + 5%
200 mW
4.080 mm x 3.102 mm
1/60s - 20 µs
1/30s - 20 µs
1/4"
48 dB
49 dB
6.0 µm x 6.0 µm
10 mW/s @ 60°C
0.22% of VPEAK-TO-PEAK
14.22 mm x 14.22 mm
Figure 1 OV7950/OV7451 Pin Diagram (Top View)
30 29 28 27 26 25 24 23 22 21 20 19
RES 31
DOVDD 32
PCLK 33
NC 34
NC 35
NC 36
NC 37
NC 38
NC 39
NC 40
NC 41
NC 42
OV7950/OV7451
18 VS
17 ADGND
16 ADVDD
15 SCK
14 ESO
13 CS
12 ESI
11 FSIN
10 RESET
9 OVL2
8 OVLEn
7 PWDN
43 44 45 46 47 48 1 2 3 4 5 6
Version 2.5, February 28, 2006
Proprietary to OmniVision Technologies
1
1 page  
Omni ision
www.DaOtavSehreleat4yU.Ccoomntrol
The OV7950/OV7451 CAMERACHIP has an overlay
capability where the user can store an overlay bit map
image in an external storage device with an SPI interface.
At power up, OV7950/OV7451 will start the SPI interface
when the OVLEn pin (pin 8) is set high. [Bit7, Bit0] ≠ "10"
in the first address indicates that there is no SPI slave
device attached, causing the SPI interface to stop.
Otherwise, the OV7950/OV7451 will check bit 6 of first
byte for overwrite control. The user can define up to 15
bytes in the control register to overwrite the internal
default value (further details defining this register is not
available at this time). These 15 bytes only read one time
after power up.
If the first byte bit[7] is “1” and bit[0] is “0”,
OV7950/OV7451 will read the content in address 0x10 to
0x2B for the overlay setting.
Figure 6 SPI Overlay Process Sequence
Power-up
Does
address
0x00[6] = 1
?
Y
Overwrite 15 bytes of
internal registers with the
content from addresses
0x01~0x0F
Stop
Start SPI
Read content
in address
0x00~0x0F
Do
addresses
0x00[7] = 1 &
0x00[0] = 0
?
Y
N
Stop SPI and
Overlay
Read content
in address
0x10~0x2B
Do
addresses
0x10[7] = 1 &
0x10[6] = 0
?
Y
N
Stop Overlay
N
Read current line
overlay bit map 1
data
Does
pin OVL2 = 1
?
Y
Read current line
overlay bit map 2
data
Overlay process
Overlay process
I2C Master Start
Read I2C slave content
one byte for address,
one byte for data
Is
there no
N ACK or does
address = FF
& data = FF
?
Y
Stop I2C
Master
N Field End?
Y
Reset address
to 0x30
Field End? N
Y
Reset address to
the starting address of
overlay bit map 2
(refer to addresses
0x21 and 0x20)
Functional Description
Data formats are defined as follows:
Address
Description
0x10
Bit[7]:
Bit[6]:
ON/OFF high bit
ON/OFF low bit
0x11
Bit[7:6]:
Bit[5:4]:
Bit[3]:
Opacity1[1:0]
Resolution1[1:0]
YUV1 all replaced
0x12
Bit[7:0]: Y1
0x13
Bit[7:0]: U1
0x14
Bit[7:0]: V1
0x15
Bit[7:0]: V1 start[9:2]
0x16
Bit[7:0]: V1 end[9:2]
0x17
Bit[7:0]: H1 start[9:2]
0x18
Bit[7:0]: H1 end[9:2]
0x19
Bit[7:0]: V1 start[1:0], V1 end[1:0],
H1 start[1:0], H1 end[1:0]
0x1A
Bit[7:0]: MemLine1[7:0] (unit byte)
0x20
Bit[7:0]: Overlay set 2 start address
low 8-bit
0x21
Bit[7:0]: Overlay set 2 start address
high 8-bit
0x22
Bit[7:6]:
Bit[5:4]:
Bit[3]:
Opacity2[1:0]
Resolution2[1:0]
YUV2 all replaced
0x23
Bit[7:0]: Y2
0x24
Bit[7:0]: U2
0x25
Bit[7:0]: V2
0x26
Bit[7:0]: V2 start[9:2]
0x27
Bit[7:0]: V2 end[9:2]
0x28
Bit[7:0]: H2 start[9:2]
0x29
Bit[7:0]: H2 end[9:2]
0x2A
Bit[7:0]: V2 start[1:0], V2 end[1:0],
H2 start[1:0], H2 end[1:0]
0x2B
Bit[7:0]: MemLine2[7:0] (unit byte)
0x30 ~ 0xXX Bit map 1
Set2 start address
~ 0xXX
Bit map 2
Byte[10]
Overlay function can only be enabled when bit[7] = 1 and
bit[6] = 0.
There may be two sets of overlay bitmaps in one EPROM.
Byte [11] ~ Byte [1A] are control bytes for first bitmap.
Version 2.5, February 28, 2006
Proprietary to OmniVision Technologies
5
5 Page 
Omni ision
www.DaTtaimSheinetg4US.copmecifications
NTSC Timing
Figure 7 NTSC Standard Video Timing Diagram
HSYNC
HCOUNT / 2 HCOUNT / 2
HSYNC / 2
HCOUNT / 2 HCOUNT / 2
Timing Specifications
ANALOG
FIELD 1
520 521 522 523 524 525
1
2
3
4
5
6
7
ANALOG
FIELD 2
START
OF
VSYNC
13
258 259 260 261 262 263 264 265 266 267 268 269
Figure 8 NTSC Composite Video Signal
275 276
1.13 V
WHITE LEVEL
100 IRE
0.449 V
0.357 V
0.306 V
0.163 V
0.022 V
20 IRE
7.5 IRE
20 IRE
40 IRE
3.58 MHZ
COLOR BURST
(9 CYCLES)
BLACK LEVEL
BLANK LEVEL
SYNC LEVEL
Version 2.5, February 28, 2006
Proprietary to OmniVision Technologies
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet OV7950.PDF ] | |
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