Automotive 1.35Mpixel CMOS Image Sensor for Driver Assistance & Driverless Cars from Melexis

Automotive 1.35Mpixel CMOS Image Sensor for Driver Assistance & Driverless Cars | In Compliance Magazine

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.

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 0.005lux 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.

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