ov7725手册(可注释).pdf

2007 OmniVision Technologies, Inc.VarioPixel, OmniVision, and the OmniVision logo are registered trademarks of OmniVision Technologies, Inc. Version 1.1, March 30, 2007OmniPixel2 and CameraChip are trademarks of OmniVision Technologies, Inc. These specifications are subject to change without notice. Advanced Information Preliminary Datasheet OV7725 Color CMOS VGA (640 x480) CAMERACHIPTM Sensor Omniision with OmniPixel2TM Technology General Description The OV7725 CAMERACHIP 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 OV7725 provides full-frame, sub-sampled or windowed 8-bit/10-bit images in a wide range of formats, controlled through the Serial Camera Control Bus (SCCB) interface. This device has an image array capable of operating at up to 60 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, smearing, blooming, etc., to produce a clean, fully stable color image. Features High sensitivity for low-light operation Standard SCCB interface Output support for Raw RGB, RGB (GRB 4:2:2, RGB565/555/444) and YCbCr (4:2:2) formats Supports image sizes: VGA, QVGA, and any size scaling down from CIF to 40 x30 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 Lens shading correction Saturation level auto adjust (UV adjust) Edge enhancement level auto adjust De-noise level auto adjust Frame synchronization capability Ordering Information Pb Note: The OV7725 uses a lead-free package. ProductPackage OV07725-VL1A (Color, lead-free)28-pin CSP2 Applications Cellular and picture phones Toys PC Multimedia Digital still cameras Key Specifications Figure 1 OV7725 Pinout (Top View) Array Size640 x 480 Power Supply Digital Core1.8VDC + 10% Analog3.0V to 3.3V I/Oa 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 1.7V to 3.3V Power Requirements Active 120 mW typical (60 fps VGA, YUV) Standby< 20 A Temperature Range-20C to +70C Output Format (8-bit) YUV/YCbCr 4:2:2 RGB565/555/444 GRB 4:2:2 Raw RGB Data Lens Size1/4 Lens Chief Ray Angle25 non linear Max Image Transfer Rate60 fps for VGA Sensitivity3.0 V/(Lux sec) S/N Ratio50 dB Dynamic Range60 dB Scan ModeProgressive Electronic ExposureUp to 510:1 (for selected fps) Pixel Size6.0 m x 6.0 m Dark Current40 mV/s Well Capacity26 Ke- Fixed Pattern Noise< 0.03% of VPEAK-TO-PEAK Image Area3984 m x 2952 m Package Dimensions5345 m x 5265 m A1 ADVDD A2 RSTB A3 VREFH OV7725 A4 FSIN A5 SCL B1 ADGND B2 VREFN B4 AGND B3 AVDD B5 SDA C1 PWDN D1 D5 E1 D7 E2 D1 E5 DOVDD F1 D9 F2 D3 F3 XCLK F4 DOGND F5 D2 A6 D0 B6 HREF C6 VSYNC D6 D4 E6 D6 F6 D8 E3 DVDD E4 PCLK ?????????????? 2Proprietary to OmniVision Technologies, Inc.Version 1.1, March 30, 2007 OV7725Color CMOS VGA OmniPixel2 CAMERACHIP Sensor Omniision Functional Description Figure 2 shows the functional block diagram of the OV7725 image sensor. The OV7725 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 Figure 2 Functional Block Diagram column sense amp image array clock exposure/ gain detect test pattern generator FIFODSP* bufferbuffer image scaler analog processing video timing generator DSP* (lens shading correction, de-noise, white/black pixel correction, auto white balance, etc.)note 1 exposure/gain control SCCB interface registers A/D G R B D9:0 video port ?????????????? Functional Description Version 1.1, March 30, 2007Proprietary to OmniVision Technologies, Inc.3 Omniision Image Sensor Array The OV7725 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 Timing Generator In gener。