PAW3204 Datasheet, PDF (25/27 Pages) Pixart Imaging Inc. – LOW COST WIRELESS MOUSE SENSOR

PixArt Imaging Inc.
PAW3204DB
8.5 PCB Layout Consideration
z Caps for pins7, 8 must have trace lengths less than 5mm.
Wireless Optical Mouse Sensor
8.6 Recommended Value for R1
8.6.1 Using Red LED for 2.7V
z Radiometric intensity of red LED
Bin limits (mW/Sr at 20mA)
LED Bin Grade
Min.
P
17.7
Q
21.2
Note: Tolerance for each bin will be ± 15%
Suggested R1(ohm):
Typ.
-
-
Max.
21.2
25.4
Red LED Bin Grade
P
Q
Min.
6.8
6.8
Typ.
22
22
Max.
-
-
8.6.2 Using IR LED for 1.8V
Suggested R1(ohm):
IR LED Bin Grade
TBD
Min.
3.3
Typ.
22
Max.
-
It is not guaranteed that the performance of the mouse sensor with IR LED is as good as the mouse sensor with
red LED. The mouse sensor is designed to a very good match with red LED, and this combination has the best
performance.
8.6.3 Summary
Light Source LED Bin Grade V_LED
Red LED
P, Q
2.7
IR LED
TBD
1.8
Min.
6.8
3.3
R1
Typ.
22
22
Max.
-
-
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PixArt Imaging Inc.
E-mail: [e-mail]
25
V3.0, Apr. 2008