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ams has introduced the AS7225 smart system-on-chip sensor for tunable white lighting, based on ams technology for closed-loop CCT tuning and daylight compensation.

Interfacing to an existing host microprocessor in a smart lighting design, the AS7225 enables lighting OEMs to benefit from higher precision, more flexible LED binning and lower system costs for tunable white lighting systems.

The AS7225 is equipped with an industry-first embedded tri-stimulus CIE XYZ color sensor to enable precise color sensing with direct mapping to the International Commission on Illumination (CIE) 1931 color space, which is recognized as the standard co-ordinate definition for human perception of color. CCT and daylighting tuning directives, or instructions, are communicated to the host processor via an industry-standard I2C interface.

The AS7225 is supplied in a 20-pin LGA package measuring 4.5 x 4.7 x 2.5mm. The package has an aperture offering a ±20.5° field of view. It allows for flexible integration into luminaires, light engines and larger replacement lamps, such as LED linear T-LED products.

Facing inward toward the light source, the device provides precise CCT tuning by balancing the output from configured warm and cool white LED strings in a luminaire. Facing outward, the AS7225 can be used in luminaire designs to provide precise daylight management. It can also provide combined CCTtuning and daylighting directives with the addition of an ams TSL4531 ambient light sensor.

Also in the ams family of Cognitive Lighting products is the AS7221, a networking-enabled IoT Smart Lighting Manager with the same tri-stimulus color sensor. IoT luminaire control is performed through a network connection, or by direct connection to 0V to 10V dimmers, with control outputs that include a direct PWM channel to LED drivers, and analog 0V to 10V signals to dimming ballasts.

A simple text-based Smart Lighting Command Set and serial UART interface enable easy integration with standard network clients.

  • Comprehensive register-driven command set enabling complete sensor control plus management of precision tuning directives
  • Readable registers for CIE 1931 and CIE 1975 color-point coordinates, CCT, du’v’ and lux
  • Simple register-based commands to control and configure key light-tuning supervisory functions
  • Calibrated nano-optic silicon interference filters
  • Tunable white LED lighting



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