原标题：Avago ADNS-3090光学鼠标传感解决方案

　　Avago 公司的ADNS-3090是高性能光学鼠标传感器，鼠标运动速度高达60吋/秒，加速度高达20g。采用嵌入式架构，大大提高了光学导航性能，可选择的分辨率为1800 cpi 或 3500 cpi，可编程帧速率超过6400帧/秒，单电源3.3V工作，主要用在游戏机，计算机，工作站的鼠标，以及集成的输入设备。本文介绍了ADNS-3090主要特性，方框图，USB，PS/2鼠标应用电路图和应用装配框图。

　　ADNS-3090： High Performance Optical Mouse Sensor

　　The ADNS-3090 is a high performance addition to Avago Technologies’ popular ADNS family of optical mouse sensors.

　　The ADNS-3090 is based on a new, faster architecture with improved navigation. The sensor is capable of sensing high speed mouse motion - up to 60 inches per second and acceleration up to 20g – for increased user precision and smoothness.

　　The ADNS-3090 along with the ADNS-2120-001 trim lens, ADNS-2220-001 assembly clip and HLMP-ED80-XX000 form a complete, compact optical mouse tracking system. There are no moving parts, which means high reliability and less maintenance for the end user. In addition, precision optical alignment is not required, facilitating high volume assembly. The sensor is programmed via registers through a four-wire serial port. It is packaged in a 20-pin staggered dual inline package (DIP).

　　Theory of Operation

　　The ADNS-3090 is based on Optical Navigation Technology, which measures changes in position by optically acquiring sequential surface images (frames) and mathematically determining the direction and magnitude of movement. It contains an Image Acquisition System (IAS), a Digital Signal Processor (DSP), and a four-wire serial port.

　　The IAS acquires microscopic surface images via the lens and illumination system. These images are processed by the DSP to determine the direction and distance of motion. The DSP calculates the Δx and Δy relative displacement values.

　　An external microcontroller reads the Δx and Δy information from the sensor serial port. The microcontroller then translates the data into PS2 or USB signals before sending them to the host PC or game console.

　　ADNS-3090主要特性：

　　High speed motion detection – up to 60 ips and 20g

　　Enhanced architecture for greatly improved optical navigation technology

　　Programmable frame rate over 6400 frames per second

　　SmartSpeed self-adjusting frame rate for optimum performance

　　Serial port burst mode for fast data transfer

　　1800 cpi or 3500 cpi selectable resolution

　　Single 3.3 volt power supply

　　Four-wire serial port along with Chip Select, Power Down, and Reset pins

　　ADNS-3090应用：

　　Mice for game consoles and computer games

　　Mice for desktop PC’s, Workstations, and portable PC’s

　　Trackballs

　　Integrated input devices

　　图1。ADNS-3090光学鼠标传感器方框图

　　Notes

　　1. Caps for pins 15 and 17 MUST have trace lengths LESS than 5 mm to nearest ground pin.

　　2. Pins 15 and 17 caps MUST use pin 16 GND.

　　3. Pin 9, if used, should not be connected to PCB GND to reduce potential RF emissions.

　　4. The 0.1 uF caps must be ceramic.

　　5. Caps should have less than 5 nH of self inductance.

　　6. Caps should have less than 0.2 Ω ESR.

　　7. NC pins should not be connected to any traces.

　　8. Surface mount parts are recommended.

　　9. Care must be taken when interfacing a 5V microcontroller to the ADNS-3090. Serial port inputs on the sensor should be connected to opendrain outputs from the microcontroller or use an active drive level shifter. NPD and RESET should be connected to 5V microcontroller outputs through a resistor divider or other level shifting technique.

　　10. VDD3 and GND should have low impedance connections to the power supply.

　　11. Capacitors connected to pin 15 and 17 should be connected to pin 16 and then to pin 19.

　　图2。ADNS-3090 USB，PS/2鼠标应用电路图

　　图3。ADNS-3090应用装配框图