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Details, datasheet, quote on part number:OV7141
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Datasheet text preview:
Omni
General Description
ision
TM
Advanced Information Preliminar y Datasheet
OV7640 Color CMOS VGA (640 x 480) CAMERACHIPTM OV7141 B&W CMOS VGA (640 x 480) CAMERACHIPTM Applications
· · · Cellular and Picture Phones Toys PC Multimedia
The OV7640 (color) and OV7141 (black and white) CAMERACHIPSTM are low voltage CMOS image sensors that provide the full functionality of a single-chip VGA (640 x 480) camera and image processor in a small footprint package. The OV7640/OV7141 provides full-frame, sub-sampled or windowed 8-bit images in a wide range of formats, controlled through OmniVision's Serial Camera Control Bus (SCCB) interface. This product family has an image array capable of operating at up to 30 frames per second (fps) 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 CAMERACHIPs use proprietary sensor technology to improve image quality by reducing or eliminating common lighting/electrical sources of image contamination such as fixed pattern noise, smearing, blooming, etc. to produce a clean, fully stable color image.
Key Specifications
Power Supply Po wer Requirements Array Size Core Analog I/O Active 640 x 480 (VGA) 2.5VDC + 10% 2.5VDC + 4% 2.25V to 3.3V 40 mW (30 fps, including I/O power) 30 µW -10°C to 70°C 0°C to 50°C · YUV/YCbCr 4:2:2 · RGB 4:2:2 · Raw RGB Data 1/4" 30 fps 60 fps 3.0 V/Lux-sec 1.12 V/Lux-sec 46 dB 62 dB Progressive/Interlaced 523 x tROW 0.45 5.6 µm x 5.6 µm 30 mV/s 60 Ke < 0.03% of VPEAK-TO-PEAK 3.6 mm x 2.7 mm 11.43 mm x 11.43 mm
Standby Temperature Operation Range Stable Image Output Formats (8-bit)
Maximum Image Transfer Rate
Features
· · · · High sensitivity for low-light operation 2.5V operating voltage for embedded portable applications Standard Serial Camera Control Bus (SCCB) interface VGA, QVGA (sub-sampled) and Windowed outputs with Raw RGB, RGB (GRB 4:2:2), YUV (4:2:2) and YCbCr (4:2:2) formats Automatic image control functions including: Automatic Exposure Control (AEC), Automatic Gain Control (AGC), Automatic White Balance (AWB), Automatic Brightness Control (ABC), Automatic Band Filter (ABF) for 60Hz noise and Automatic Black-Level Calibration (ABLC) Image quality controls including color saturation, hue, gamma, sharpness (edge enhancement), anti-blooming and zero smearing
Lens Size VGA QVGA B& W Sensitivity Color S/N Ratio Dynamic Range Scan Mode Maximum Exposure Interval Gamma Correction Pixel Size Dark Current Well Capacity Fixed Pattern Noise Image Area Package Dimensions
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Figure 1 OV7640/OV7141 Pin Diagram
V DD _ A VS S_ A S IO _D 27 NC SI O_ C 26 NC NC 28
4
3
2
1
PWDN NC VREF VDD_C VSYNC
5 6 7 8 9 10 11
25 24 23
Y0 Y1 Y2 Y3 Y4 Y5 Y6
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Ordering Information
Product OV7640 (Color) OV7141 (B&W) Package PLCC-28 PLCC-28
OV7640/OV7141
22 21 20 19
HREF PCLK
12 V DD _I O
13 CL K
14 NC
15 R E SE T
16 NC
17 V SS _ D
18 Y7
Version 1.4, March 6, 2003
Proprietary to OmniVision Technologies
1
OV7640/OV7141
CMOS VGA (640 x 480) CAMERACHIPTM
Omni
ision
Functional Description
Figure 2 shows the functional block diagram of the OV7640/OV7141 image sensor. The OV7640/OV7141 includes: · Image Sensor Array (640 x 480 resolution) · Timing Generator · Analog Processing Block · A/D Converters · Output Formatter · Digital Video Port · SCCB Interface
Figure 2 OV7640/OV7141 Functional Block Diagram
Analog Processing
R
G
B
MUX
A/D
Output Formatter Data Formatting
Saturation Hue Brightness
Gain WB Gamma Y Cb MUX Cr A/D
Windowing
Image Array (640 x 480)
Row Select
Control Registers (To all circuits)
Digital Video Port
Y[7:0]
Column Sense Amps RESET PWDN Timing Generator SCCB Interface
VREF 1.0 µf
CLK HREF PCLK VSYNC SIO_C SIO_D
2
Proprietary to OmniVision Technologies
Version 1.4, March 6, 2003
Omni
ision
Functional Description
Image Sensor Array
The OV7640/OV7141 CAMERACHIPS has an active image array size of 640 columns x 480 rows (307,200 pixels). However, the full array contains 652 columns and 486 rows, with the extra 6 rows used for black-level calibration ("Optical Black") and color interpolation information. Figure 3 shows a cross-section of the image sensor array.
A/D Converters
After the Analog Processing Block, the color channel data signal is fed to two 8-bit Analog-to-Digital (A/D) converters via the multiplexers, one for the Y/G channel and one shared by the CrCb/BR channels. These A/D converters operate at speeds up to 12MHz, and are 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.
Figure 3 Image Sensor Array
Microlens
Color Filter
Photo Diode
Timing Generator
In general, the timing generator controls these functions: · Array control and frame generation (VGA and QVGA outputs) · Internal timing signal generation and distribution · Frame rate timing · Automatic Exposure Control (AEC) · External timing outputs (VSYNC, HREF and PCLK)
Output Formatter
This block controls all output and data formatting required prior to sending the image out.
Digital Video Port
These two bits increase IOL / IOH drive current and can be adjusted as a function of the customer's loading:
Analog Processing Block
This block performs all analog image functions including: · Automatic Gain Control (AGC) · Automatic White Balance (AWB) · Image quality controls including: Color saturation Hue Gamma Sharpness (edge enhancement) Anti-blooming Zero smearing
SCCB Interface
The Serial Camera Control Bus (SCCB) interface controls the CAMERACHIP operation. Refer to OmniVision Technologies Serial Camera Control Bus (SCCB) Specification for detailed usage of the serial control port.
Version 1.4, March 6, 2003
Proprietary to OmniVision Technologies
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