Intersil公司的ISL29125是集成了IR阻塞滤波器的数字RGB彩色光传感器,具有低功耗,高灵敏度和I2C(SMBus兼容)接口, 工作电流56μA,关断电流0.5μA ,工作电压2.25到 3.63V,主要用在智能手机,PDA,GPS,平板电脑,LCD TV,数码相框,数码相机,打印机色彩增强,工业/商用LED照明色彩管理,环境光色彩检测/修正以及OLED显示器老化补偿.本文介绍了ISL29125主要特性,框图,典型应用电路以及RGB评估板电路图,材料清单,PCB元件布局图.

　　The ISL29125 is a low power, high sensitivity, RED, GREEN, and BLUE color light sensor (RGB) with an I2C (SMBus compatible) interface. Its state-of-the-art photodiode array provides an accurate RGB spectral response and excellent light source to light source variation (LS2LS). The ISL29125 is designed to reject IR in light sources allowing the device to operate in environments from sunlight to dark rooms. The integrating ADC rejects 50Hz and 60Hz flicker caused by artificial light sources. A selectable range allows the user to optimize sensitivity suitable for the specific application. In normal operation mode the device consumes 56μA which reduces to 0.5μA in power down mode. The ISL29125 supports hardware and software user programmable interrupt thresholds. The Interrupt persistency feature reduces false trigger notification. The device operates on supplies (VDD) from 2.25V to 3.63V, I2C supply from 1.7V to 3.63V, and operating temperature over the -40℃ to +85℃.

　　ISL29125主要特性:

　　• 56μA operating current, 0.5μA shutdown current

　　• Selectable range (Via I2C)

　　• I2C (SMBus compatible) output

　　• ADC resolution 16 bits

　　• Programmable interrupt windows

　　• Two optical sensitivity ranges

　　- Range 0 = 5.7m lux to 375 lux

　　- Range 1 = 0.152 lux to 10,000 lux

　　• Operating power supply 2.25 to 3.63V

　　• I2C power supply 1.7V to 3.63V

　　• 6 Ld ODFN (1.65x1.65x0.7mm) package

　　ISL29125应用:

　　• Smart phone, PDA, GPS, tablet PCs, LCD-TVs, digital picture frames, digital cameras

　　• Dynamic display color balancing

　　• Printer color enhancement

　　• Industrial/commercial LED lighting color management

　　• Ambient light color detection/correction

　　• OLED display aging compensation

　　图1. ISL29125框图

　　图2. ISL29125典型应用框图

　　RGB评估板

　　The RGB Evaluation Kit is designed to evaluate the performance of the RGB sensor. The kit is accompanied by a graphical user interface (GUI) that contains the CIE 1931 Chromaticity diagram with Planckian locus in an x, y- coordinate system, with cross marks to point out where the RGB sensor position is on the graph. The GUI facilitates evaluation of parameters such as raw data of Red, Green and Blue as well as X, Y and Z corrected lux measurements and also performs interrupt functions. Data can be viewed on the GUI and/or saved to a text file for future analysis. The GUI software is compatible with Windows XP®, Windows Vista®, and Windows® 7. This provides a simple user interface for exercising the device features.

　　The system (MCU, DUT) is powered directly from the universal serial bus (USB) or from a single-supply voltage of 2.25V to 3.6V. The evaluation board must be connected to a computer through the mini USB port for the system to function. The system uses a USB MCU to communicate to the DUT via I2C/SMBus interface.

　　图3.RGB评估板外形图

　　RGB评估板材料清单: