PixArt Imaging Inc.

PAW3203DI

Wireless Optical Mouse Single Chip

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11

PixArt Imaging Inc.

V0.3 April. 2008

5.5 PCB Layout Consideration

Caps for pins 8, 10, 11, 12 must have trace lengths less than 5mm.

The trace lengths of OSCOUT, OSCIN must less than 6mm.

The trace length of RFosc, RFcarrier must as short as possible.

5.6 Recommended Value for R1

5.6.1 Using Red LED

Radiometric intensity of red LED

Bin limits (mW/Sr at 20mA)

Note: Tolerance for each bin will be ± 15%

Suggested R1:

Red LED Bin Grade

Suggested R1 (ohm)

N

12

P

12

Q

12

5.6.2 Using IR LED

Suggested R1:

IR LED Bin Grade

Suggested R1 (ohm)

TBD

0

It is not guaranteed that the performance of PAW3203DI with IR LED is as good as PAW3203DI with red LED.

PAW3203DI is designed to a very good match with red LED, and this combination has the best performance.

5.6.3 Summary

Light Source

LED Bin Grade

VDD

R1 (ohm)

Red LED

N, P, Q

2.7

12

IR LED

TBD

1.8

0

LED Bin Grade

Min.

Typ.

Max.

N

14.7

-

17.7

P

17.7

-

21.2

Q

21.2

-

25.4