色彩传感器-Color Sensor

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The color sensor product family provides red, green, blue and clear (RGBC) light sensing for precise color measurement, determination, and discrimination. A SYNC input allows for greater accuracy by enabling the color sensing to be synchronized with an external event. For example, in LED solid state lighting, the SYNC input enables the color reading to be synchronized with the PWM signal and illumination of the LEDs. Color sensors are available with a built-in IR blocking filter for accurate color measurement by minimizing the effects due to unwanted IR light sources in sunlight and other light sources.

色彩传感器又叫颜色识别传感器或颜色传感器，在终端设备中起着极其重要的作用，比如色彩监视器的校准装置；彩色打印机和绘图仪；涂料、纺织品和化妆品制造，以及医疗方面的应用，如血液诊断、尿样分析和牙齿整形等。色彩传感器系统的复杂性在很大程度上取决于其用于确定色彩的波长谱带或信号通道的数量。此类系统种类繁多，从相对简单的三通道色度计到多频带频谱仪不一而足。

The light-to-digital device contains a 4 × 4 photodiode array, integrating amplifiers, ADCs,
accumulators, clocks, buffers, comparators, a state machine, and an I2C interface. The 4 × 4 photodiode array
is composed of red-filtered, green-filtered, blue-filtered, and clear photodiodes — four of each type. Four
integrating ADCs simultaneously convert the amplified photodiode currents to a digital value providing up to 16
bits of resolution. Upon completion of the conversion cycle, the conversion result is transferred to the data
registers. The transfers are double-buffered to ensure that the integrity of the data is maintained.
Communication to the device is accomplished through a fast (up to 400 kHz), two-wire I2C serial bus for easy
connection to a microcontroller or embedded controller.

The light-to-digital device provides a separate pin for level-style interrupts. When interrupts are enabled and a pre-set value
is exceeded, the interrupt pin is asserted and remains asserted until cleared by the controlling firmware. The
interrupt feature simplifies and improves system efficiency by eliminating the need to poll a sensor for a light
intensity value. An interrupt is generated when the value of an RGBC conversion exceeds either an upper or
lower threshold. In addition, a programmable interrupt persistence feature allows the user to determine how
many consecutive exceeded thresholds are necessary to trigger an interrupt


厂商：ams
产品：TCS34715等
官方资料：链接

• Color Light Sensing
  

   − Programmable Analog Gain, Integration Time, and Interrupt Function with Upper and Lower Thresholds
   − Resolution Up to 16 Bits
   − Very High Sensitivity — Ideally Suited for Operation Behind Dark Glass
   − Up to 1,000,000:1 Dynamic Range

• Low Power Wait State
  

   − 65 A Typical Current
   − Wait Timer is Programmable from 2.4 ms to > 7 Seconds

• I2C Interface Compatible
  

   − Up to 400 kHz (I2C Fast Mode)

• Dedicated Interrupt Pin
• Small 2 mm  2.4 mm Dual Flat No-Lead Package
• Sleep Mode — 2.5 A Typical Current
  

Applications
 Color Temperature Sensing
 RGB LED Backlight Control
 Color Display Closed-Loop Feedback Control
 Ambient Light Sensing for Display Brightness Control
 Industrial Process Control
 Medical Diagnostics



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