PixArt Imaging Inc.
PAW3203DI
Wireless Optical Mouse Single Chip
5.5 PCB Layout Consideration
z
z
z
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
z
Radiometric intensity of red LED
Bin limits (mW/Sr at 20mA)
LED Bin Grade
Min.
14.7
17.7
21.2
Typ.
Max.
17.7
21.2
25.4
N
P
-
-
-
Q
Note: Tolerance for each bin will be ± 15%
z
Suggested R1:
Red LED Bin Grade Suggested R1 (ohm)
N
P
12
12
12
Q
5.6.2 Using IR LED
z
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
IR LED
N, P, Q
TBD
2.7
1.8
12
0
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PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
11
V0.3 April. 2008
PIXART [ PIXART IMAGING INC. ]
