CCT and full-colour sensor targets colorimeters and colour analysers

May 09, 2017 // By Julien Happich
Delivered in a 4.5x4.7mm LGA package with a ±20.5° field of view, ams' AS7261 tri-stimulus colour sensor provides direct XYZ colour co-ordinates consistent with the CIE 1931 2° Standard Observer framework.

It also maps the XYZ co-ordinates to the x, y (Y) of the two-dimensional colour gamut and scales them to the CIE 1976 u’v’ coordinate system. The multi-channel filter set integrated at the silicon wafer level provide Dark, Clear and Near-Infrared channels as well as the XYZ colour sensing channels. All sensor count outputs are accessible via I2C or UART interfaces and a programmable LED driver allows for electronic shutter control and synchronization. The measurements of white light made by the AS7261 are typically accurate to ±0.002 du’v’ on the CIE 1976 scale.

This high performance, superior to that of any comparable chip-scale colour sensor on the market, is maintained thanks to the durable and stable silicon filter set integrated on to the sensor die. The filter is highly resistant to the temperature and ageing effects to which conventional filters are prone, and intelligence integrated into the sensor allows for calibration as part of the manufacturing process. These in-line calibration processes often eliminate the need for end product manufacturers to calibrate each end-device on their own production line. The chip draws a maximum operating current of just 5mA, and works from a 3.3V supply. An evaluation board for the AS7261 JENCOLOR XYZ sensor is available from the ams ICdirect online store.

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