5

Sensor

Clip

Lens / Light Pipe

Base Plate

Surface

LED

PCB

Figure 7. Sectional view of PCB assembly highlighting optical mouse components

ADNS-3040

NCS

SCLK

MOSI

MISO

MOTION

VDD

Oscillator

LED Drive

XY_LED

GND

DSP

SHTDWN

Image Array

AVDD

AGND

Figure 6. Block diagram of ADNS-3040 optical mouse sensor

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. 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

Note

that the lens material is polycarbonate and therefore, cyanoacrylate based adhesives or other adhesives that may damage the lens should NOT be used.

Typical Distance

Millimeters

Creepage

16.0

Clearance

2.1

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.

5. Place the lens onto the base

plate.

6. 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.

7. 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.

8. 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.

9. Install mouse top case.

There MUST be a feature in

the top case to press down

onto the clip to ensure all

components are interlocked

to the correct vertical

height.

Design considerations for improved

ESD Performance

For improved electrostatic

discharge performance, typical

creepage and clearance

distance are shown in the

table below. Assumption: base

plate construction as per the

Agilent supplied IGES file and

ADNS-3120-001 lens.