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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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