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ADAS SoC
ADAS SoC
WT8893
【 General Description 】
The WT8893 is a highly-integrated video processor SoC dedicated for ADAS/AVM applications. The chip includes CVBS input from 4 channel video decoders, 4 individual contrast/brightness adjustment function, input scaling up/down for accurate fish-eye correction, input image position adjustment function to correct the camera assembling error, video image processing, fisheye correction, perspective adjustment, combine front/rear/left/right four images to top view with adjustable image size and boundary fusion processing providing seamless AVM image, AWB technology to provide a uniform image, output video contrast/brightness/sharpness adjustment and scaling adjustment, OSD, video encoder, output interface with one analog NTSC/PAL CVBS or digital CCIR 656/601 output or DVR 720P raw data (30/60Hz), serial flash memory (max. 2ea) for JPG and MCU code, external 1GB (64M*16) DDR for video buffer (max. 2GB), and SPI/I2C interfaces.
This chip has been qualified for the Automotive Electronics Council standard Q100 (AEC-Q100) Grade 2. While most AVM chips in the market are DSP-based solution, the WT8893 is hardwired ASIC which provides cost-effective solution with low-power consumption compared to its counterparts.
【 Features 】
● 32-bit MCU embedded
● Video digital input interface
CVBS input from 4 channel video decoders through CCIR 656, YUV 4:2:2 image format
  - Resolution: NTSC 720 x 480i,PAL 720 x 576i
  - 4-channel multiplexed inputs at 108 MHz with 9-bit inputs
● Input video color process
  - 4 individual vignetting compensation
● Input scaling up/down for accurate fish-eye correction
● Input image position adjust to correct error of assembling camera
  - 4 individual picture X-Y axis position and size adjustment
  - 4 individual mirror function
● Fish-eye correction Process
  - Display video and video image process
  (a) Front video: original, horizontal 180° (XV(-45)), horizontal 130° (FE(130))
  (b) Rear video: original, horizontal 180° (XV(-45)), horizontal 130° (FE(130))
  (c) Right video: original, horizontal 65° (YV(50~80) + FE(90) + ZV(45))
  (d) Left video: original, horizontal 65° (YV(50~80) + FE(90) + ZV(45))
  (e) AVM video: front + rear + right + left video image process
  (f) Adjustable resolution 1°
  (g) 4 video input sources can be selected to any 4 video processes.
  - Fish eye angle correction
  (a) adjustable range 130° ~ 190°, adjustable resolution 1°
  (1) 150° (115° horizontal - 85° vertical -150° diagonal) (±5°)
  (2) 170° (130° horizontal - 96° vertical -170° diagonal) (±5°)
  (3) 180° (180° horizontal - 112° vertical - 180° diagonal) (±5°)
  (b) 4 individual lens distortion calibration: 4 stage radial ± adjustment
  - New video process algorithm improve image saw-tooth
  - Perspective adjustment
  - Combine 4 images to top view
  (a) adjust the image size of front/rear/left/right
  (b) content shift up/down/right/left and few angle rotation
  (c) the AVM image spilt screen can be adjusted
  - Video window width / height / location adjustment
  - Scaling up/down process
Output video zoom in/out and position adjustment
● Provide seamless AVM image by fusion boundary
● Increase 4 images uniformity by auto white balance
● Frame Rate Conversion
  - From 50/60 Hz input to 50/60 Hz output
  - Group Delay Under 100ms
● Output video color process
  - Contrast adjustment
  - Brightness adjustment
  - Sharpness adjustment
● OSD
  - Support multi overlap layers display including background ICON Video, Static parking guidance lines, distance display, Visualization UPA.
  - Background/ICON
  - Support JPG file format
  - JPG file for ICON and background
  - Support JPG file alpha-blending and dynamic image fade in/fade out effect
  - Support JPG file transparent
  - Support JPG copy / move function
  - 6 layer overlap including JPEG, UPA, ...etc.
  - Character using for distance display
  (a) Character size16*18 pixel
  (b) Support 64 colors
  (c) Support alpha-blending and transparent
  (d) Support 2X, 3X, 4X magnify
  (e) Support blinking (programmable period and duty cycle)
  (f) Position could be adjusted
  - Static parking guidance lines
  (a) 8 colors (user programmable) for static car motion line function
  (b) Support alpha-blending
  (c) Line width size can be adjusted
  (d) Position can be adjusted
  (e) Support fish-eye (non-straight) mode
● Visualization UPA
  (a) Support 4 rectangle display
  (b) Support 8 color (user programmable) for display
  (c) Support alpha-blending for display
  (d) Position and size could be adjusted
● Overlap layer priority
  - Video < JPG (background) < Static distance guide lines < Character < Visualization UPA
  - Adjust individual alpha-blending register
● Output process
  - Support ouput scaling adjustment
● Video encoder
  - Standard Video output CVBS: NTSC/PAL
● Output interface
  - 1 analog NTSC/PAL CVBS
  - 1 digital CCIR 656 or 601 output
  - DVR Raw Data 720P (30/60 Hz)
● Memory Interface
  - Serial flash memory (max. 2ea) for JPG and MCU code
  - Support 1GB 64M*16 (Max. 2Gb) DDR2 SDRAM memory for video buffer
● Slave mode controller Interface
  - High speed SPI/I2C interface
● Electrical Characteristics
  - Operating Temperature: -40 ºC ~ +105 ºC
  - Storage Temperature: -50 ºC ~ +125 ºC
● AEC-Q100
  - This product has been qualified to the Automotive Electronics Council (AEC) standard Q100 (Grade 2)
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