APDS-9700单片集成电路解决方案 LED驱动电路[中国电子设计网]

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商务信息栏目开通公告 [2008-05-19 11:47:00]

□ APDS-9700单片集成电路解决方案

APDS-9700单片集成电路解决方案

［作者：未知转贴自：Avago 点击数：更新时间：2008-5-14

【字体： A 】

Avago公司的APDS-9700专用单片集成电路解决方案，它包括LED驱动电路，太阳光消除和内置LED高保护电路，提供足够的电流来驱动光学传感器发光，并使传感器的输出适合控制器可靠地读取，从而增加光学传感器的性能和可靠性。APDS-9700采用2mm x 2mm QFN封装，为设计者大大节省了PCB空间，广泛应用在PDA和移动手机，手持设备，笔记本电脑，工业自动化，无接触开关和公共厕所的自动控制。本文介绍了APDS-9700的主要特性，方框图，典型应用电路图以及所用的元器件与评估版电路图。

APDS-9700
Signal Conditioning IC for Optical Proximity Sensors

APDS-9700 is a single chip solution that consists of a LED driver circuit, sunlight cancellation and built-in LED stuck high protection circuit integrated into a single chip.

APDS-9700 has artificial light immunity and is also operational under the sun. Design flexibility is optimized as APDS-9700 can be paired up with an integrated proximity sensor or discrete pair solution.
APDS-9700 is a signal conditioning IC that enhances the performance and robustness of the optical sensors used for proximity or object detection.

APDS-9700 is a single chip solution that consists of a LED driver circuit, sunlight cancellation and built-in LED stuck high protection circuit integrated into a single chip. APDS-9700 has artificial light immunity and is also operational under the sun. Design flexibility is optimized as APDS-9700 can be paired up with an integrated proximity sensor or discrete pair solution.

APDS-9700 can be disabled to maximize power savings and battery life in applications such as portable or battery-operated devices. The LED current of the optical proximity sensors can be configured to different levels using a limiting resistor at the LEDA pin. APDS-9700 also provides user flexibility to control the pulse width with suitable burst rate, duty cycle and frequency that can reduce power consumption. These low power consumption features makes it also ideal for low power mobile and handheld devices.

APDS-9700 is capable of operating at voltage supply ranging from 2.4 V to 3.6 V. APDS-9700 has two separate output pins for analog and digital outputs. This provides flexibility
to use either the analog or digital output (or both) depending on the requirements of the application.

The device is packaged in 8-pin QFN package measuring 0.55mm(H) x 2mm(W) x 2mm(L).

主要特性：

Low power consumption
LED pulse width control
Low shut down current
External LED drive-current control
Complete shutdown mode
Supply voltage : 2.4 V to 3.6 V
Operational in sunlight conditions up to 100klux(with HSDL-9100)
Artificial light immunity
Analog & Digital output available
Built in hysteresis comparator for digital output
LED stuck High protection
Wide bandwidth Trans-impedance amplifier
External capacitor and resistor for integration and gain controls
Flexibility to enhance detection distance up to 200mm with HSDL-9100 or further with external discretes pair
Small 2mm x 2mm QFN 8-pin package
Design flexibility to pair with Avago Proximity Sensors or discretes pair solution
Lead-free&ROHS Compliant

应用：
PDA and mobile phones
Portable and Handheld devices
Personal Computers/Notebooks
Amusement/Games/Vending Machines
Industrial Automation
Contactless Switches
Sanitary Automation

图1.APDS-9700 框图

图2. APDS-9700典型应用电路图

APDS-9700典型应用电路中所用的元器件：

图3. APDS-9700和HSDL-9100的测试电路

图4.评估板电路图

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