Calibrated XYZ colour sensor brings new precision to handheld analyzers
The AS7261 JENCOLOR XYZ sensor is a complete platform for colour sensing, which features;
– CCT and full-colour sensor which 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.
– multi-channel filter set integrated at the silicon wafer level, providing Dark, Clear and Near-Infrared channels as well as the XYZ colour sensing channels
– calibrated CCT, x, y, u’v’ duv and direct sensor count outputs accessible via I²C or UART interfaces
– programmable LED driver for electronic shutter control and synchronization
– aperture with integrated lensing built into the device’s 4.5 x 4.7 mm LGA package, with a ±20.5° field of view for high sensing accuracy
– simple text-based AT command set enabling a host microcontroller or processor to configure operation of the device
The AS7261’s accurate tri-stimulus XYZ colour sensing capability means that it mimics the human eye’s response curve, known as the ‘standard observer’ colour model as represented by the CIE 1931 and CIE 1976 colour mapping systems. 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, claimed as superior to that of any comparable chip-scale colour sensor on the market, is maintained with a 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. Suited to use in battery-powered products, it draws a maximum operating current of 5 mA from a 3.3V supply. Pricing is $4.00 (1,000). An evaluation board for the AS7261 JENCOLOR XYZ sensor is available from the ams ICdirect online store.
ams; www.ams.com/Multi-Spectral-Sensing/AS7261
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