8Mpixel image sensor with high dynamic range optimized for harsh lighting conditions
The AR0822 from onsemi produces high image quality in mixed dark and bright lighting using embedded high dynamic range capability, while minimizing the burden on the host processor.
The onsemi AR0822 is an 8Mpixel stacked 1/1.8-inch (8.81mm diagonal) back-side illuminated (BSI) CMOS digital image sensor based on a 2.0µm pixel. Providing a rolling-shutter readout, the AR0822 features an active pixel array of 3,840px x 2,160px and produces 4K video at a rate of 60 frames/s. The sensor offers the high dynamic range (HDR) and near infrared (NIR) response required for operation in harsh or uncontrolled lighting conditions.
By taking an alternative approach enabled by its on-chip embedded functionality, the AR0822 reduces system bandwidth and processor power to achieve HDR, compared to traditional methods that require an external image signal processor to combine images. The sensor supports linear, line-interleaved HDR (LI-HDR), and embedded HDR (eHDR) modes. In 3-exposure eHDR mode at 30 frames/s, the typical power consumption is 540mW.
To further reduce system power consumption in battery-powered applications, the AR0822 includes a wake-on-motion function. This feature allows the host processor to enter a low-power standby mode until the sensor detects motion and triggers the processor to resume active mode.