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PixArt Imaging Inc. Confidential

1

SDNS-3988

High Performance Gaming Sensor

Description

SDNS-3988 high performance gaming sensor is a new addition to

PixArt Imaging’s gaming sensor family. The tracking system

comprises of navigation IC, HSDL-4261 IR LED and lens. It

provides enhanced features such as user calibrated lift detection,

variable frame rate, programmable resolution, angle tunability,

angle snap plus configurable sleep and wake up time to suit

various gamers’ preferences.

This gaming sensor is in a 58-pin QFN package. It is designed to

be used with ADNS-2120-001 trim lens to achieve optimum

performance featured in this document.

Theory of Operation

The sensor 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, USB, or RF

signals before sending them to the host PC or game console.

Features



Small form factor QFN package



VDDIO range: 1.65 – 3.3V



16-bits motion data registers



Maximum speed motion detection of 200ips and acceleration

up to 50g



Variable Frame Rate for optimum power performance



Motion detect pin output



Internal oscillator – no external clock input needed



Enhanced Programmability



Frame rate up to 12500fps



Lift Detection



Default lift cut-off height – typical 3mm from tracking

surface



Manually calibrated lift cut-off height – optimized for

individual surface



Resolution up to 6400cpi with step of ~50cpi



X and Y axis independent resolution setting



Register enabled Rest Modes



Angle Snap and Angle Tunabilty

Applications

 Corded and cordless gaming mice

 Motion input devices