Integrated molded lead-frame DIP Sensor
Theory of Operation
The ADNS-7550 integrated molded lead-frame DIP
sensor comprises of sensor and VCSEL in a single
The advanced class of VCSEL was engineered by PixArt
Imaging 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 PixArt
VCSEL remains within single mode operation over a wide
range of output power. It has significantly lower power
consumption than a LED. It is an excellent choice for
optical navigation applications.
The sensor is based on Laser 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.
• Wide operating voltage: 4.0V-5.25V.
• Small form factor, integrated molded lead-frame chip-
• Laser Technology
• High speed motion detection up to 30 ips and 8g
• Enhanced SmartSpeed self-adjusting frame rate for
• Motion detect pin output
• 12-bits motion data registers.
• Internal oscillator – no clock input needed.
• Selectable 400, 800, 1200, 1600, 2000 cpi resolution.
• Four wire serial port
• Minimal number of passive components
• Laser fault detect circuitry on-chip for Eye Safety
• Advanced Technology VCSEL chip
• Single Mode Lasing operation
• 832-865 nm wavelength
• Laser Mice
• Optical trackballs
• Integrated molded lead-frame input devices
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PixArt Imaging Inc.