6

PCB Assembly Considerations

1. Insert the sensor and all other electrical components

into PCB.

2. Insert the LED into the assembly clip and bend the

leads 90 degrees.

3. Insert the LED clip assembly into PCB.

4. This sensor package is only qualified for wave-solder

process.

5. Wave solder the entire assembly in a no-wash solder

process utilizing solder fixture. The solder fixture 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 fixture should be designed to expose the sensor

leads to solder while shielding the optical aperture

from direct solder contact.

6. Place the lens onto the base plate.

7. Remove the protective Kapton tape from optical

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 first

vertically for the Kapton removal process.

8. Insert PCB assembly over the lens onto the base plate

aligning post to retain PCB assembly. The sensor

aperture ring should self-align to the lens.

9. The optical position reference for the PCB is set by the

base plate and lens. Note that the PCB motion due to

button presses must be minimized to maintain optical

alignment.

10. Install mouse top case. There MUST be a feature in

the top case to press down onto the PCB assembly to

ensure all components are interlocked to the correct

vertical height.

IMPORTANT NOTE: P-bin LED or better is recommended.

Figure 6. Exploded View of Assembly

Customer supplied base plate with

recommended alignment features

per IGES drawing

Trim Lens

Customer supplied PCB

Sensor

Clip

LED

PixArt Imaging Inc.

ADNS-2700 Single Chip USB Optical Mouse Sensor

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PixArt Imaging Inc.