昨天拆了一个鼠标，其中的核心光流芯片丝印是：A5090 B1201A。这个芯片是Avago（现Broadcom）的ADNS-5090型光电导航传感器芯片。
这里是它的Datasheet技术手册：
https://www.application-datasheet.com/pdf/broadcom/adns-5090.pdf
ADNS-5090基本功能描述
The Avago Technologies ADNS-5090 is a low power, small form factor optical mouse sensor. It has a low-power architecture and automatic power management modes, mak
ing it ideal for battery, power-sensitive applications – such as cordless input devices.
ADNS-5090是一颗低功耗、小体积的光学鼠标传感器。它具备低功耗架构和自动电源管理机制，因而适用于电池供电、功耗敏感型应用，例如无线输入设备（无线鼠标）。
The ADNS-5090 is capable of high-speed motion detection – up to 30ips and 8G. In addition, it has an on-chip oscillator and LED driver to minimize external components.
这颗芯片具有高速运动检测能力 – 支持最高30ips（英寸/秒）的速度检测和8G的加速度检测。额外的，芯片本身内置震荡晶振和LED驱动，以减少外围元件、降低电路复杂度。
The ADNS-5090 along with the ADNS-5110-001 lens, LED clip, and HLMP-EG3E-xxxxx LED form a complete and compact mouse tracking system. There are no moving parts and this translates to high reliability and less maintenance for the end user. In addition, precision optical alignment is not required, facilitating high volume assembly.
这颗ADNS-5090芯片，可搭配ADNS-5110-001镜头模组、LED固定架、HLMP-EG3E-xxxxx系列LED灯，构成一套完整的轨迹跟踪系统（鼠标）。
整套总成没有机械移动结构，意味着具有更高的稳定性、可靠性，更低的维护、维修成本。无需精密的光学对准，因而适用于大规模生产与手动批量组装。
The sensor is programmed via registers through a fourwire serial port. It is housed in an 8-pin staggered dual inline package (DIP).
通过四线串行接口可对此传感器（ADNS-5090）进行寄存器访问从而对其编程。整颗芯片是8引脚错列式双列直插封装。
NOTE: The ADNS-5090 Low Power Optical Mouse Sensor is not designed for use with blue LEDs. The ADNS-4000 product is available from Avago for use with Blue LEDs
注意：5090传感器不适合与蓝光LED搭配使用。适合于蓝光LED的相似传感器是ADNS-4000型号。
额外的困惑：DIP-8我见过的基本就是对称双列，这里的ADNS-5090为什么要非对称、错列封装？
