25

SQUAL Value (White Paper) after SROM download

At Z = 2.4mm, 1100cpi, Circle@7.5" diameter, Speed=6ips

Mean SQUAL vs Z (White Paper) after SROM download

1100cpi, Circle@7.5" diameter, Speed=6ips

0

40

80

120

160

200

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

Delta from Nominal Focus (mm)

Avg-3sigma

Avg

Avg+3sigma

0

40

80

120

160

200

1

56

111 166 221 276 331 386 441 496 551 606 661 716 771 826 881

Count

SQUAL

Address: 0x07

Access: R

Reset Value: 0x00

Bit

76543210

Field

SQ7

SQ6

SQ5

SQ4

SQ3

SQ2

SQ1

SQ0

Data Type: Upper 8-bits of a 11-bit unsigned integer.

USAGE:

The SQUAL (Surface quality) register is a measure of the number of valid features visible by the sensor in the

current frame. Use the following formula to find the total number of valid features.

Number of Features = SQUAL Register Value * 8

The maximum SQUAL register value is 40(Dec) (0x28). Since small changes in the current frame can result in

changes in SQUAL, variations in SQUAL when looking at a surface are expected. The graph below shows 900

sequentially acquired SQUAL values, while a sensor was moved slowly over white paper.

Figure 18. SQUAL Values (White Paper)

Figure 19. Mean SQUAL vs. Z (White Paper)

PixArt Imaging Inc.

Track-on-Glass Laser Sensor

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PixArt Imaging Inc.