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AS7261 Spectral Sensing Engine

Tri-stimulus XYZ + NIR sensor device with electronic shutter and smart interface


  • Tri-stimulus XYZ+NIR realized by silicon interference filters
  • Selectable UART or I²C interface
  • 16-bit ADC with digital access
  • Integrated programmable LED drivers
  • integrated micro controller
  • 20-pin LGA package 4.5mm x 4.7mm x 2.5mm, with built-in aperture
  • In-factory calibrated


  • Stable filter conditions over temperature and life time
  • Compact true-color sensing, XYZ coordinates direct from the sensor
  • Signal processing on chip, reduced hardware costs
  • Sample illumination without external LED driver
  • Easy connecting to mobile devices or external µController

Product parameters

Sensor Type XYZ tri-stimulus/standard observer
Applications Color analysis and color calibration
I/O I²C master or UART (mode configurable)
Package 20-pin LGA with aperture
Size [mm] 4.5 x 4.7 x 2.5
Supply Voltage [V] 2.7 to 3.6
Temperature Range [°C] -40 to +85

General description

The AS7261 integrates Gaussian interference filter technology to enable chromatic white color sensor which provides direct XYZ color coordinates consistent with the CIE 1931 2° standard observer color coordinates. Additional mapping of XYZ coordinates to the x, y (Y) of the 2-dimensional color gamut and scales of the CIE 1976 u’v’ coordinate system, providing accurate correlated color temperature (CCT) measurements and color point deviation from the black body curve for white light color in the ∆u’v’ coordinate system. A near-IR channel and LED drivers with programmable currents increase application flexibility, including support for electronic shutter applications.

Control and spectral data access is implemented either through either the I²C virtual register set, or via the serial UART enabling use of the high level smart spectral command set.

This product suits for the following applications:

  • Color/CCT sensing
  • Fluid or reagent analysis
  • Color point comparison
  • Display calibration
  • Authentication


Title Category Headline Buy
AS726xDemoKit Application Board Demo Kit for AS726x


Type Description Language
Application Data Reference Design and Schematic AS726x 1V1 English
Evaluation Software AS72xx Firmware Update using GUI EN
Evaluation Software AS726x Spectral Sensing iSPI GUI EN

Technical documents

Type Description Language
Datasheet Document version 1-00 English
Application Note AS72xx – EEPROM Updating using I2C 1V02 English
Application Note AS726x Design Considerations English
Application Note AS72xx How to Flash AS72xx Firmware using English
Application Note AS72xx How to Program AS72xx Firmware with FlashCatUSB 1V24 English
Quick Start Guide AquaSensor Quick Start Guide for Hardware and Software based on AS7261 English
User Guide AS726x-iSPI Evaluation Kit User Guide English
User Guide AS726x-iSPI Evaluation Kit GUI User Guide English

Environmental documents

Type Description Language
RoHS Certificate RoHS AS7261 English


Type Description Language
Product Change Notification CN25-2019 (Customer Information AS72xx) English

Other information

Type Description Language
Block Diagram AS7261 Block Diagram English
Factsheet AS7261 Spectral_ID a new class of Spectral Sensing Products English
Spectral Video

Spectral ID iSPI Eval Kit

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