Onsemi cmos platform aims to improve image quality

Onsemi 2.6Mpixel AR0233 cmos image sensor

On Semiconductor has announced a cmos image sensor platform to improve performance and image quality in automotive applications such as adas, mirror replacement, rear and surround view systems, and autonomous driving.

The Hayabusa platform has a 3.0µm backside illuminated pixel design that delivers a charge capacity of 100,000 electrons, with other automotive features such as simultaneous on-chip high dynamic range (HDR) with LED flicker mitigation (LFM), plus real-time functional safety and automotive grade qualification.

“The Hayabusa family enables automakers to meet the evolving standards for adas such as Euro NCap 2020, and offer next-generation features such as electronic mirrors and high-resolution surround view systems with anti-flicker technology,” said Ross Jatou, general manager of On Semiconductor’s automotive division.

The scalable approach of the sensors from 1.27 to 0.635cm optical sizes reduces development time and effort for multiple car platforms.

“On Semiconductor has been shipping image sensors with this pixel architecture in high-end digital cameras for cinematography and television,” said Jatou. “We are now putting this proven architecture into new sensors developed from the ground up for automotive standards.”

The high charge capacity of this pixel design enables every device in the Hayabusa family to deliver what the company calls Super-Exposure capability, which results in 120dB HDR images with LFM for high image fidelity in the most challenging scenes without sacrificing low-light sensitivity.

The simultaneous HDR and LFM capability is important in enhancing safety as it ensures that all objects and potential hazards can be identified in both very dark and very bright areas of the scene. With the widespread use of LEDs for front and rear lighting as well as traffic signs, the LFM capability makes certain that pulsed light sources do not appear to flicker, which can lead to driver distraction or, in the case of front facing adas, the misinterpretation of a scene by machine vision algorithms.

The family also includes real-time, ISO 26262-compliant functional safety capabilities to alert the system processor if the sensor has any issues or potential errors. These features enable system designs rated up to Asil C. The real-time capability enables errors to be identified immediately rather than waiting for the full image to be transferred to the processor and then waiting for image analysis.

This faster response time means the processor can take immediate action to remedy the issue, which is crucial when considering that a vehicle moving on a motorway easily covers 30m in less than a second.

The first product in this family, the 2.6Mpixel AR0233 cmos image sensor, can run at 60fps while simultaneously delivering HDR and LFM along with all of the Hayabusa platform features. Samples are available now.


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