Highly scalable image sensor platform has ultra-wide dynamic range

Highly scalable image sensor platform has ultra-wide dynamic range

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By Christoph Hammerschmidt

According to ON Semiconductor, the Hayabusa platform enables car manufacturers to meet the advanced ADAS standards of the European NCAP 2020 guidelines. It supports upcoming functions such as electronic mirrors and high-resolution panoramic systems with anti-flicker technology. The scalable approach of sensors from ¼” To 1/2″ optical size reduces the development effort when multiple vehicle platforms are equipped with them and accelerates the time to market. ON Semiconductor has used the pixel architecture in existing sensors high-end digital cameras in the field of motion picture production and television and is now applying this architecture to develop new sensors that meet the requirements of automotive standards, the company said.

The high charge capacity of this pixel design ensures that each Hayabusa series sensor provides a so-called super-exposure feature that delivers 120dB and LFM HDR images for high fidelity in the most demanding scenes without sacrificing light sensitivity. The simultaneous HDR/LFM function is particularly important to increase safety. This ensures that all objects and possible dangers are detected in very dark and very bright areas of the scene. As LEDs are increasingly being used for headlamps, taillights and road signs, the platform’s LFM function ensures that pulsed light sources do not appear flickering, which would distract the driver or, in the case of forward-facing ADAS, could lead to misinterpretation of a scene by image processing algorithms.

The Hayabusa series also provides real-time functional safety functions in accordance with ISO26262 to alert the system processor if the sensor has problems or potential errors. These functions can be used to evaluate systems with up to ASIL-C. Real-time capability allows to identify errors immediately instead of waiting for the full image to be transferred to the processor and waited for an image analysis. This faster response time allows the system processor to take immediate action to fix the problem. This is crucial when considering that a vehicle moving on a motorway travels 30 meters in less than one second.

The first CMOS sensor of this series, the AR0233 with 2.6 megapixels (MP), operates at 60 fps and offers all Hayabusa platform functions, including UHDR and LFM. Samples will be available to Early Access customers from October 2017.

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