基于环境光传感器和接近传感器的背光和智能照明控制参考设计

此系统动态调节背光灯相对于环境光源的亮度，以此实现节能和延长背光灯使用寿命的目的。当用户靠近时，电容式接近传感器可唤醒系统，从而进一步节能。

·使用铜质 PCB 材料或其他导电材料进行人体接近检测

·良好的人眼光谱匹配

·动态调节背光亮度

·采用紫外线滤波器，适合室外使用

·湿度和温度传感器

·此子系统经过测试，并包含硬件文件、固件、演示和入门指南

TIDA-00373背光源和智能照明控制受环境光线和距离感应参考设计图

TIDA-00373精确背光源和智能照明控制与环境光感应功能框图

Design Features

·Detects Human Proximity Using Copper PCB Material or Other Conductive Materials

·Good Human Eye Spectral Matching

·<1% IR Response

·Optical Power Sensitivity (0.01 to 83,886 Lux)

·HDC1000 Humidity and Temperature Sensor

·Dynamically Adjusts Backlight Brightness

·UV Filter for Outdoor Use

·EM Connector for Wireless Solutions

Featured Applications

·Building Automation

·Proximity Detection

·Smart Thermostat

·Smart Lighting

·Control Panels

·Connector for Wireless Solutions

This system conserves power and extends the life of the backlight elements by dynamically adjusting a backlight’s brightness in reference to the ambient light in the surrounding environment. Backlight brightness adjustments also allow a more comfortable viewing experience for the user. More power savings and backlight life can be achieved through a sleep or standby mode. The proximity wake up feature can sense a human is close and wakes up the system.

The optical light sensor made by Texas Instruments has good human eye spectral matching, which allows the system to adjust the backlight brightness to be most comfortable when viewed by the human eye. A simple algorithm determines the ideal backlight brightness when the backlight is activated.

Proximity wake up is enabled by Texas Instruments’ capacitive-to-digital converter. A capacitive sensor located around the edge of the board provides a 360-degree sensing field around the board. Proximity detection works best when approaching the front of the device.

This design guide covers component selection, measurement theory, system calibration, and environmental compensation.

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