Optical Mouse-How it works+what are these components

Click For Summary
SUMMARY

The discussion focuses on the internal components of an optical mouse, specifically identifying and understanding the roles of various integrated circuits (ICs) and other components. The user inquires about the function of U3, a component related to the scroll wheel, and the main IC, B0863C, which is crucial for processing light reflection. The conversation also clarifies that "U" denotes IC reference designators, while "Y" indicates a crystal or oscillator. The optical mouse's light source is confirmed to be a standard LED, and the Avago Technologies ADNS-7050 is referenced as a comparable model.

PREREQUISITES
  • Understanding of electronic components such as ICs, resistors, and capacitors.
  • Familiarity with optical mouse technology and its components.
  • Basic knowledge of circuit diagrams and schematic symbols.
  • Ability to interpret datasheets for electronic components.
NEXT STEPS
  • Research the Avago Technologies ADNS-7050 datasheet for detailed specifications.
  • Learn about the function and design of optical sensors in mice.
  • Explore the role of light sources in optical devices, focusing on LED technology.
  • Investigate common IC reference designators and their meanings in circuit design.
USEFUL FOR

Electronics enthusiasts, hardware engineers, and students studying circuit design or optical technology will benefit from this discussion.

pat666
Messages
703
Reaction score
0

Homework Statement



Pictures of an optical mouse I took apart are attached. We had to find a circuit, take a picture, draw the circuit diagram and explain how it works.

I'm not sure what a few of the components are. U3 is for the scroll wheel but what is it? U1 (the big IC) is the guts of the circuit but when I google B0863C (number written on it) I can't even get a data sheet for it. I know it registers something to do with the light reflected back into it but what? does the wavelength change when I move the mouse or something? Also is the light source just a standard LED or is it special? Also there doesn't seem to be a U2 where would that be? And what is U standing for in general (R is resistor, C is capacitor etc) .

Finally, what is Y1 - it looks like a capacitor and is right beside the IC.

Thanks for any help
 

Attachments

  • MOUSE!.jpg
    MOUSE!.jpg
    28.2 KB · Views: 592
  • MOUSE@.jpg
    MOUSE@.jpg
    41.9 KB · Views: 693
Physics news on Phys.org
It is probably something similar to the Avago Technologies ADNS-7050.
Datasheet: http://www.avagotech.com/docs/AV02-1411EN"

"U" is the letter used for IC reference designators.

"Y" is used for crystal, oscillator, or resonator
 
Last edited by a moderator:

Similar threads

Engineering DC circuit analysis: conceptual mistake?
  • · Replies 1 ·
Replies
1
Views
2K
Engineering Is a career in Optics/Photonics engineering right for me?
  • · Replies 5 ·
Replies
5
Views
1K
How to wire an emergency flashlight?
  • · Replies 9 ·
Replies
9
Views
2K
Engineering How does this Bipolar RF Amplifier + Output Transformer circuit work?
  • · Replies 18 ·
Replies
18
Views
4K
Undergrad How to couple light from a very small source into spectrometer?
  • · Replies 10 ·
Replies
10
Views
2K
How to determine if electrical components are connected in parallel or in series?
  • · Replies 10 ·
Replies
10
Views
1K
Engineering How do short/open-circuit tests work for step-up transformers?
  • · Replies 7 ·
Replies
7
Views
3K
Engineering Is it possible for a low pass filter to have such a transfer function?
  • · Replies 16 ·
Replies
16
Views
2K
High School Multimode optical fiber, physics beginner help :D
  • · Replies 37 ·
2
Replies
37
Views
4K
Protecting PCB, multiplexers and MCU in vending machines
  • · Replies 11 ·
Replies
11
Views
2K