Avago ADBM-A350小型光手指导航解决方案

Avago公司的ADBM-A350小型(SFF)光手指导航系统,具有低功耗和自动功率管理模式,使它非常适合以电池为能源和对功率敏感的应用如手机,高达20ips的高速运动检测,自调整祯速率以得到最佳性能,运动检测中断和手机检测中断,可选择125, 250, 500, 750, 1000 和1250 cpi分辨率,模拟和数字单电源1.8V工作,主要用在手指输入设备,移动设备,综合输入设备和以电池为能源的输入设备.本文介绍了ADBM-A350主要特性和典型应用电路.
The ADBM-A350 sensor is a small form factor (SFF) optical finger navigation system.
The ADBM-A350 is a low- power optical finger navigation sensor. It has a new, low-power architecture and automatic power management modes, making it ideal for battery-and power-sensitive applications such as mobile phones.
The ADBM-A350 is capable of high-speed motion detection – up to 20ips. In addition, it has an on-chip oscillator and integrated LED for optical navigation to minimize external components.
There are no moving parts, thus provide 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 either a serial peripheral interface or a two wire interface port. It is packaged into a 17-pin FPC module for ease of assembly via ZIF connector.
Theory of Operation
The ADBM-A350 is based on Optical Finger Navigation (OFN) Technology, which measures changes in position by optically acquiring sequential surface images (frames) and mathematically determining the direction and magnitude of movement.
The ADBM-A350 contains an Image Acquisition System (IAS), a Digital Signal Processor (DSP), and a communication system.
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.
The host reads the Δx and Δy information from the sensor serial port if a motion interrupt is pu...