adns-4700 Avago Technologies, adns-4700 Datasheet - Page 6

• Manufacturer Part Number: adns-4700
• Description: Single Chip Usb Optical Mouse Sensor
• Manufacturer: Avago Technologies

IMPORTANT NOTE: U-bin LED or better is recommended.
Figure 6. Exploded View of Assembly
PCB Assembly Considerations
1. Insert the sensor and all other electrical components
2. Insert the LED into the assembly clip and bend the
3. Insert the LED clip assembly into PCB.
4. This sensor package is only qualifi ed for wave-solder
5. Wave solder the entire assembly in a no-wash solder
6. Place the lens onto the base plate.
6
into PCB.
leads 90 degrees.
process.
process utilizing solder fi xture. The solder fi xture is
needed to protect the sensor during the solder process.
It also sets the correct sensor-to-PCB distance as the
lead shoulders do not normally rest on the PCB surface.
The fi xture should be designed to expose the sensor
leads to solder while shielding the optical aperture
from direct solder contact.
LED
Clip
Sensor
Customer supplied PCB
Trim Lens
Customer supplied base plate with
recommended alignment features
per IGES drawing
7. Remove the protective Kapton tape from optical
8. Insert PCB assembly over the lens onto the base plate
9. The optical position reference for the PCB is set by the
10. Install mouse top case. There MUST be a feature in
aperture of the sensor. Care must be taken to keep
contaminants from entering the aperture. Recommend
not to place the PCB facing up during the entire mouse
assembly process. Recommend to hold the PCB fi rst
vertically for the Kapton removal process.
aligning post to retain PCB assembly. The sensor
aperture ring should self-align to the lens.
base plate and lens. Note that the PCB motion due to
button presses must be minimized to maintain optical
alignment.
the top case to press down onto the PCB assembly to
ensure all components are interlocked to the correct
vertical height.