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Automotive 1.35Mpixel CMOS image sensor for driver assistance & driverless cars

October 17, 2014 By Megan Hollis Leave a Comment

Combines industry-leading image quality with ASIL-ready support functions that will expedite the emergence of autonomous vehicles

• Moonless night conditions down to 0.005 lux (SNR1 illuminance)
• 125dB HDR output without additional ISP chip
• Reduced flicker effect of pulsing LED lights
• Extensive set of self-testing ASIL support functions for emerging safety systems

Melexis introduces its 3rd generation of automotive image sensors – the MLX75421 Blackbird. This automotive grade, high dynamic range (HDR) image sensor features an extensive set of on-chip functional safety (ASIL) support functions. It has been architected for automotive safety applications like automatic emergency braking (AEB), electronic mirrors/camera monitor systems (CMS) and autonomous evasive steering. The device is also highly optimized for next generation viewing applications like surround/rear view systems with object detection functions.

Picture of Automotive 1.35Mpixel

The MLX75421 Blackbird’s set of ASIL support functions are explicitly aimed at a cost-effective implementation of ASIL systems. These functions take care of the digital aspects but moreover also cover the sensor’s analog functions and the sensor interface. As a result, the sensor generates an embedded ‘frame valid’ flag for every frame based on intensive run-time self-testing.

With a resolution of 1344×1008 pixels, the MLX75421 Blackbird has a 1/3” optical format. It features a 4 stabilized kneepoint HDR response curve which provides up to 125dB of HDR inside every frame. The HDR full frame rate is 45fps, while 60fps can be achieved when capturing image data from 800 rows. This makes the image sensor also compatible with 720p applications. The device runs fully automatically in HDR mode without the need for a companion chip.

Designed for low noise operation, the MLX75421 Blackbird has a dark leakage of less than 5 electrons/s at 25°C and dark temporal noise of less than 4.4 electrons for a 1/30s exposure time. This results in an SNR1 illuminance value of 0.005 lux for light with a wavelength of 535nm over a 1/30s exposure time. The device has a wide operating temperature range of -40°C to +115°C, which benefits its temperature robustness.

The MLX75421 Blackbird image sensor series consists of 4 versions: monochrome, RCCC, color RGBG and color RGBC. Production is planned to start early 2015.

Melexis
www.melexis.com

Filed Under: Applications Tagged With: melexis

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