ADNS-7550

Integrated molded lead-frame DIP Sensor

Data Sheet

Theory of Operation

The ADNS-7550 integrated molded lead-frame DIP sensor comprises of sensor and VCSEL in a single package. The advanced class of VCSEL was engineered by Avago Technologies to provide a laser diode with a single lon-gitudinal and a single transverse mode. In contrast to most oxide-based single-mode VCSEL, this class of Avago VCSEL remains within single mode operation over a wide range of output power. It has signi cantly lower power consumption than a LED. It is an excellent choice for optical navigation applications.

The sensor is based on LaserStream technology, which measures changes in position by optically acquiring se-quential 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 il-lumination 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 microcon-troller then translates the data into PS2, USB, or RF signals before sending them to the host PC or game console.

Features

x Wide operating voltage: 4.0V-5.25V.

x Small form factor, integrated molded lead-frame chip-on-board packagex LaserStream technology

x High speed motion detection up to 30 ips and 8g x Enhanced SmartSpeed self-adjusting frame rate for optimum performance x Motion detect pin outputx 12-bits motion data registers.

x Internal oscillator – no clock input needed.x Selectable 400, 800, 1200, 1600 cpi resolution.x Four wire serial port

x Minimal number of passive components

x Laser fault detect circuitry on-chip for Eye Safety Compliance x Advanced Technology VCSEL chip x Single Mode Lasing operationx 832-865 nm wavelength

Applications

x Laser Mice x Optical trackballs

x Integrated molded lead-frame input devices