OV7671 Datasheet PDF - OmniVision Technologies

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OV7671
OmniVision Technologies

Part Number OV7671
Description (OV7670 / OV7671) CMOS VGA CameraChip
Page 30 Pages


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Omni
ision
®
Advanced Information
Preliminary Datasheet
OV7670/OV7171 CMOS VGA (640x480) CAMERACHIPTM Sensor
with OmniPixel ® Technology
General Description
The OV7670/OV7171 CAMERACHIPTM image sensor is a low
voltage CMOS device that provides the full functionality of a
single-chip VGA camera and image processor in a small
footprint package. The OV7670/OV7171 provides full-frame,
sub-sampled or windowed 8-bit images in a wide range of
formats, controlled through the Serial Camera Control Bus
(SCCB) interface.
This product has an image array capable of operating at up
to 30 frames per second (fps) in VGA with complete user
control over image quality, formatting and output data
transfer. All required image processing functions, including
exposure control, gamma, white balance, color saturation,
hue control and more, are also programmable through the
SCCB interface. In addition, OmniVision sensors use
proprietary sensor technology to improve image quality by
reducing or eliminating common lighting/electrical sources of
image contamination, such as fixed pattern noise (FPN),
smearing, blooming, etc., to produce a clean, fully stable
color image.
Note: The OV7670/OV7171 uses a
Pb lead-free package.
Features
• High sensitivity for low-light operation
• Low operating voltage for embedded portable apps
• Standard SCCB interface compatible with I2C interface
• Output support for Raw RGB, RGB (GRB 4:2:2,
RGB565/555/444), YUV (4:2:2) and YCbCr (4:2:2)
formats
• Supports image sizes: VGA, CIF, and any size scaling
down from CIF to 40x30
• VarioPixel® method for sub-sampling
• Automatic image control functions including: Automatic
Exposure Control (AEC), Automatic Gain Control
(AGC), Automatic White Balance (AWB), Automatic
Band Filter (ABF), and Automatic Black-Level
Calibration (ABLC)
• Image quality controls including color saturation, hue,
gamma, sharpness (edge enhancement), and
anti-blooming
• ISP includes noise reduction and defect correction
• Supports LED and flash strobe mode
• Supports scaling
• Lens shading correction
• Flicker (50/60 Hz) auto detection
• Saturation level auto adjust (UV adjust)
• Edge enhancement level auto adjust
• De-noise level auto adjust
Ordering Information
Product
OV07670-VL2A (Color, lead-free)
OV07171-VL2A (B&W, lead-free)
Package
24 pin CSP2
24 pin CSP2
Applications
• Cellular and Picture Phones
• Toys
• PC Multimedia
• Digital Still Cameras
Key Specifications
Active Array Size
Digital Core
Power Supply
Analog
I/O
Power
Requirements
Temperature
Range
Active
Standby
Operation
Stable Image
Output Formats (8-bit)
Lens Size
Chief Ray Angle
Maximum Image
Transfer Rate
Sensitivity
S/N Ratio
Dynamic Range
Scan Mode
Electronics Exposure
Pixel Size
Dark Current
Well Capacity
Image Area
Package Dimensions
640 x 480
1.8VDC +10%
2.45V to 3.0V
1.7V to 3.0Va
60 mW typical
(15fps VGA YUV format)
< 20 µA
-30°C to 70°C
0°C to 50°C
• YUV/YCbCr 4:2:2
• RGB565/555/444
• GRB 4:2:2
• Raw RGB Data
1/6"
25°
30 fps for VGA
1.3 V/(Lux sec)
46 dB
52 dB
Progressive
Up to 510:1 (for selected fps)
3.6 µm x 3.6 µm
12 mV/s at 60°C
17 K e
2.36 mm x 1.76 mm
3785 µm x 4235 µm
a. I/O power should be 2.45V or higher when using the internal
regulator for Core (1.8V); otherwise, it is necessary to provide
an external 1.8V for the Core power supply.
Figure 1 OV7670/OV7171 Pin Diagram (Top View)
A1
AVDD
A2
SIO_D
A3
SIO_C
A4
D1
A5
D3
B1
PWDN
B2
VREF2
B3
AGND
B4
D0
B5
D2
C1
DVDD
C2
VREF1
D1
VSYNC
D2
HREF
OV7670/OV7171
E1
PCLK
E2
STROBE
E3
XCLK
E4
D7
E5
D5
F1
DOVDD
F2 F3
RESET# DOGND
F4
D6
F5
D4
7670CSP_DS_001
© 2006 OmniVision Technologies, Inc.
Version 1.4, August 21, 2006
OmniPixel, VarioPixel, OmniVision, and the OmniVision logo are registered trademarks of OmniVision Technologies, Inc.
CameraChip is a trademark of OmniVision Technologies, Inc.
These specifications are subject to change without notice.



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OV7670/OV7171 CMOS VGA (OmniPixel®) CAMERACHIPSensor
Omni ision
Functional Description
Figure 2 shows the functional block diagram of the OV7670/OV7171 image sensor. The OV7670/OV7171 includes:
Image Sensor Array (total array of 656 x 488 pixels, with active pixels 640 x 480 in YUV mode)
Analog Signal Processor
A/D Converters
Test Pattern Generator
Digital Signal Processor (DSP)
Image Scaler
Timing Generator
Digital Video Port
SCCB Interface
LED and Strobe Flash Control Output
Figure 2 Functional Block Diagram
Buffer Buffer
Analog
Processing
G
R
B
Test
Pattern
Generator
A/D
50/60 Hz
Auto
Detect
DSP Image
(Lens shading Scaler
correction,
de-noise, white/
black pixel
correction, auto
white balance,
etc.)
FIFO
Video
Port
D[7:0]
Column Sense Amp
Image Array
(656 x 488)
Exposure/Gain
Detect
Clock
Video Timing Generator
XCLK
STROBE HREF PCLK VSYNC RESET# PWDN
Exposure/Gain
Control
Registers
SCCB
Interface
SIO_C
SIO_D
7670CSP_DS_002
2 Proprietary to OmniVision Technologies, Inc.
Version 1.4, August 21, 2006



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Omni ision
Functional Description
Image Sensor Array
Test Pattern Generator
The OV7670/OV7171 sensor has an image array of
656 x 488 pixels for a total of 320,128 pixels, of which
640 x 480 pixels are active (307,200 pixels). Figure 3
shows a cross-section of the image sensor array.
Figure 3 Image Sensor Array
The Test Pattern Generator features the following:
• 8-bar color bar pattern
• Fade-to-gray color bar pattern
• Shift "1" in output pin
Microlens
Glass
Blue
Green
Red
7670CSP_DS_003
Timing Generator
In general, the timing generator controls the following
functions:
• Array control and frame generation
• Internal timing signal generation and distribution
• Frame rate timing
• Automatic Exposure Control (AEC)
• External timing outputs (VSYNC, HREF/HSYNC, and
PCLK)
Analog Signal Processor
This block performs all analog image functions including:
• Automatic Gain Control (AGC)
• Automatic White Balance (AWB)
Digital Signal Processor (DSP)
This block controls the interpolation from Raw data to
RGB and some image quality control.
• Edge enhancement (a two-dimensional high pass
filter)
• Color space converter (can change Raw data to RGB
or YUV/YCbCr)
• RGB matrix to eliminate color cross talk
• Hue and saturation control
• White/black pixel correction
• De-noise
• Lens shading correction
• Programmable gamma control
• Transfer 10-bit data to 8-bit
Image Scaler
This block controls all output and data formatting required
prior to sending the image out. This block scales
YUV/RGB output from VGA to CIF and almost any size
under CIF.
Digital Video Port
A/D Converters
After the Analog Processing block, the bayer pattern Raw
signal is fed to a 10-bit analog-to-digital (A/D) converter
shared by G and BR channels. This A/D converter
operates at speeds up to 12 MHz and is fully synchronous
to the pixel rate (actual conversion rate is related to the
frame rate).
In addition to the A/D conversion, this block also has the
following functions:
• Digital Black-Level Calibration (BLC)
• Optional U/V channel delay
• Additional A/D range controls
In general, the combination of the A/D Range Multiplier
and A/D Range Control sets the A/D range and maximum
value to allow the user to adjust the final image brightness
as a function of the individual application.
Register bits COM2[1:0] increase IOL/IOH drive current
and can be adjusted as a function of the customer’s
loading.
SCCB Interface
The Serial Camera Control Bus (SCCB) interface controls
the CAMERACHIP sensor operation. Refer to OmniVision
Technologies Serial Camera Control Bus (SCCB)
Specification for detailed usage of the serial control port.
LED and Strobe Flash Control Output
The OV7670/OV7171 has a Strobe mode that allows it to
work with an external flash and LED.
Version 1.4, August 21, 2006
Proprietary to OmniVision Technologies, Inc.
3



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Pin Description
Pin Description
Table 1
Pin Description
Pin Number Name
Pin Type
Function/Description
A1 AVDD
Power
Analog power supply
A2 SIO_D
I/O SCCB serial interface data I/O
A3 SIO_C
Input
SCCB serial interface clock input
A4 D1a
Output
YUV/RGB video component output bit[1]
A5 D3
Output
YUV/RGB video component output bit[3]
Power Down Mode Selection
B1
PWDN
Input (0)b
0: Normal mode
1: Power down mode
B2
VREF2
Reference Reference voltage - connect to ground using a 0.1 µF capacitor
B3 AGND
Power
Analog ground
B4 D0
Output
YUV/RGB video component output bit[0]
B5 D2
Output
YUV/RGB video component output bit[2]
C1 DVDD
Power
Power supply (+1.8 VDC) for digital logic core
C2
VREF1
Reference Reference voltage - connect to ground using a 0.1 µF capacitor
D1
VSYNC
Output
Vertical sync output
D2 HREF
Output
HREF output
E1 PCLK
Output
Pixel clock output
E2
STROBE
Output
LED/strobe control output
E3 XCLK
Input
System clock input
E4 D7
Output
YUV/RGB video component output bit[7]
E5 D5
Output
YUV/RGB video component output bit[5]
F1
DOVDD
Power
Digital power supply for I/O (1.7V ~ 3.0V)
Clears all registers and resets them to their default values.
F2
RESET#
Input
0: Reset mode
1: Normal mode
F3
DOGND
Power
Digital ground
F4 D6
Output
YUV/RGB video component output bit[6]
F5 D4
Output
YUV/RGB video component output bit[4]
a. D[7:0] for 8-bit YUV or RGB (D[7] MSB, D[0] LSB)
b. Input (0) represents an internal pull-down resistor.
Version 1.4, August 21, 2006
Proprietary to OmniVision Technologies, Inc.
4



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