Avago APDS-9800环境光传感器手机应用方案

Avago公司的 APDS-9800集成了环境光传感器(ALS),接近传感器(PS)和环境光消除功能.在一个封装内包含三个芯片: 环境光传感器, 接近传感器信号调理电路和接近传感器.工作电压2.4V到3.6V,光谱响应特性接近人眼睛,内置的LED和检测器用于接近式传感器,光灵敏度可随光源而变,各种照明都保持线性输出,主要用在PDA,手机,手提设备,笔记本电脑和上网本,娱乐设备,游戏机和售货机.本文介绍了APDS-9800的主要特性, 功能方框图以及典型应用电路和材料清单.

The APDS-9800 integrates ambient light sensor (ALS), proximity sensor (PS) and ambient light cancelation functions in a single module. The module contains three chips in one small package: an ambient light sensor IC, a proximity sensor signal conditioning circuit and a proximity sensor that includes both an LED emitter and detector.

The ambient light sensor has a spectral response close to the CIE standard photopic observer and a current output.

The proximity sensor signal conditioning circuit has an LED driver and a receiver circuit that has both analog and digital outputs. With the built-in LED, the proximity sensor is able to sense the proximity of an object, such as a finger, hand or head that is close to a portable device. The PS also features an excellent ambient light cancellation circuit for operation in direct sunlight.

By detecting the ambient light illuminance level, the ambient light sensor can control the brightness of display backlights.

The proximity sensor makes many interesting and useful applications possible. For example, a proximity sensor can detect the proximity of a mobile phone user’s head and turn off or on the phone keypad and LCD backlight.

By combining an ambient light sensor and proximity sensor in a single compact module, mobile phones, PDAs and notebooks can have additional features or benefit from increased performance, such as in battery life.

APDS-9800主要特性:

• Integrated module with ambient light sensor, proximity sensor and signal conditioning IC

• Small form factor: L 4.95 x W 3.0 x H 1.45 mm

• Supply voltage range: 2.4 V to 3.6 V

• Spectral responsivity closely matches the human eye

• Built-in LED and detector for proximity detection

• Low sensitivity variation across various light sources

• Linear output across a wide illumination range

• Operates under strong sunlight and artificial light

• Controlled LED driving current, pulse and burst parameters

• Controlled output voltage and integration time with an external resistor and capacitor

• LED stuck High protection

• Both analog and digital outputs available

• Shutdown mode for low current consumption

• Lead-free and RoHS compliant

APDS-9800应用:

• PDAs

• Mobile phones

• Portable and handheld devices

• Personal computers, netbooks and notebooks

• Amusement products

• Games

• Vending Machines

图1.APDS-9800功能方框图

图2.APDS-9800T典型应用电路

所用材料清单: