9

Enabling the SROM

For best tracking performance,SROM is required to

be loaded into ADNS-3090. This architecture enables

immediate adoption of new features and improved per-

formance algorithms. The external program is supplied

by

PixArt Imaging as a file which may be burned

into a programmable device. A micro-controller with

sufficient memory may be used. On power-up and reset,

the ADNS-3090 program is downloaded into volatile

memory using the burst-mode procedure described in

the Synchronous Serial Port section. The program size

is 1986 x 8 bits.

Regulatory Requirements

 PassesFCCBandworldwideanalogousemissionlimits

when assembled into a mouse with shielded cable and

following

PixArt Imaging’ recommendations.

 Passes IEC-1000-4-3 radiated susceptibility level when

assembled into a mouse with shielded cable and fol-

lowing

PixArt Imaging’ recommendations.

 Passes EN61000-4-4/IEC801-4 EFT tests when assem-

bled into a mouse with shielded cable and following

PixArt Imaging’ recommendations.

 UL flammability level UL94 V-0.

 Provides sufficient ESD creepage/clearance distance

to avoid discharge up to 15kV when assembled into a

mouse according to usage instructions above.

Figure 9. Distance from lens reference plane to surface

Sensor

Lens

Object Surface

2.40

0.094

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PixArt Imaging Inc.

PixArt Imaging Inc.