[原创] ADI ADPD2140测量入射红外光角度光学传感器解决方案

ADI公司的ADPD2140是用于测量入射红外光角度的光学传感器,辐射敏感面积为 0.31 mm2,具有低结电容和低暗电流,可实现与ADPD1080光度学前端的最佳集成,亦可与同步红外光源(例如发光二极管 (LED))结合使用,探测用户手部运动以进行手势识别.工作温度−40℃至 +85℃,主要用在便携设备上的用户手势界面控制,物体位置跟踪,工业/自动化监控,角度感应,接近感应和物体距离测量(三角测量).本文介绍了ADPD2140主要特性,功能框图以及评估板EVAL-ADPD2140Z主要特性,电路图和PCB布局图.

The ADPD2140 is an optical sensor that measures the angle of incident infrared light. Light angles calculated from the ADPD2140 response are linear to ±5°within an angular field of view of ±35°.

The ADPD2140 has a radiant sensitive area of 0.31 mm2. The low junction capacitance and low dark current of the ADPD2140 allows optimal integration with the ADPD1080 photometric front end. The ADPD2140 can be used with a synchronous infrared light source such as a light emitting diode (LED) to detect user hand movements for gesture recognition. The ADPD2140 requires four photodiode channels. Therefore, use the ADPD1080BCPZ with the ADPD2140.

Packaged in a small,clear mold, 2 mm×3 mm, 8-lead LFCSP, the ADPD2140 is specified over the −40℃ to +85℃ operating temperature range.

ADPD2140主要特性:

2-axis light angle measurement
Linear response to the angle of incident light
Integrated visible light blocking optical filter
No optics required and no need for precise alignment
Low junction capacitance: 12.7 pF per channel at VR = 0.2 V
Low reverse dark current: 1.74 pA at VR = 0.2 V (all four channels connected in parallel)
8-lead, 2 mm×3 mm,0.65 mm height,LFCSP

ADPD2140应用:

Gesture for user interface control in portable devices
Object location tracking
Industrial and automation monitoring
Angle sensing
Proximity sensing
Object distance measurement (triangulation)

图1.ADPD2140功能框图

图2.ADPD2140和ADPD1080连接框图

评估板EVAL-ADPD2140Z

The EVAL-ADPD2140Z evaluation kit allows users to interface with the ADPD2140 infrared (IR) light angle sensor, collect data from the ADPD2140, and evaluate gesture recognition and triangulation capabilities. The evaluation kit requires the EVAL-ADPDM3Z evaluation board and the Applications Wavetool, a graphical user interface (GUI) that provides users with low level and high level config- urability, real-time data analysis, and user datagram protocol (UDP) transfer capability, which allows the EVAL-ADPDM3Z evaluation board to interface to a PC. The Applications Wavetool can be downloaded from the EVAL-ADPD2140Z evaluation board product page. The USB port of the PC powers the EVAL-ADPDM3Z evaluation board and provides power to the EVAL-ADPD2140Z evaluation board. On-board voltage regulators provide voltage supplies for the ADPD2140. The EVAL-ADPD2140Z evaluation board schematic indicates signal names for easy identification (see Figure 12). Full specifications for the ADPD2140 are available in the ADPD2140 data sheet, which should be consulted in conjunction with this user guide when working with the EVAL-ADPD2140Z evaluation board.

评估板EVAL-ADPD2140Z主要特性:

ADPD2140 full configuration
Register level
Parameter level
Graph views
Time series view
Gesture recognition view
Triangulation view
UDP transfer capability

图3.评估板EVAL-ADPD2140Z外形图

图4.评估板EVAL-ADPD2140Z电路图

图5.评估板EVAL-ADPD2140Z PCB布局图
详情请见:

和
ADPD2140.pdf
EVAL-ADPD2140Z-UG-1358.pdf