PixArt Imaging Inc.
PAN101B
CMOS Optical Navigation Sensor
8.4 PCB layout consideration
1. Caps for pins 9, 10 MUST have trace lengths LESS than 5mm.
2. The ground wires of pin1(VSS_LED), pin5(VSSD), pin6(VSSA) must be separated from PS2/USB
connector ground node in PCB layout.
3. VSS_LED and VSSD must have trace lengths less than 100mm, VSSA must have trace lengths less
than 80mm, and typical trace width is 30mil.
4. The trace lengths of OSCOUT, OSCIN must less than 6mm.
PS2/USB onnector
D+/SCLK
PIN1
(VSS_LED)
D-/SDATA
DGND
VCC
PIN5
(VSSD)
GND
DGND
PIN6
(VSSA)
AGND
Figure 25. PCB layout consideration
8.5 Recommended value for R1
Radiometric intensity of LED
Bin limits (mW/Sr at 20mA)
Bin
N
P
Min
14.7
17.7
21.2
25.4
30.5
36.6
Max
17.7
21.2
25.4
30.5
36.6
43.9
Q
R
S
T
Note: Tolerance for each bin will be ± 15%
@5V:
LED bin
N
P
Q
R
S
T
R1 value (ohm)
100
100
100
120
120
120
Figure 26. Recommended value for R1
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PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
22
V1.4, FEB. 2003
PIXART [ PIXART IMAGING INC. ]
