The Presentation Explains about the iButton and its various applications and Specifications....

1. WELCOME

2. iButton
Presented By,
Afigith.S
13111001

3. Contents :
WHAT IS AN iBUTTON..???
iButton Components
Technology
Block Diagram of iButton
Data Transfer
Blue Dot Receptor
Application
Advantages
Disadvantages
Conclusion

4. WHAT IS AN iBUTTON..???
The iButton is a computer chip enclosed
in a 16mm thick stainless steel can.
Because of this unique and durable container, up-to-date
information can travel with a person or object anywhere
they go.

5. It was developed by Dallas/Maxim Semiconductor.

6. iButton Components:
An iButton uses its stainless steel 'can' as an electronic
communications interface.
Each can has a data contact, called the 'lid', and a ground
contact, called the 'base'. Each of these contacts is
connected to the silicon chip inside.

7. The two contacts are separated by a
polypropylene grommet.
The base forms the sides and the bottom of the can
and includes a flange to simplify attaching the button
to just about anything.
The lid is the top of the can.

8. Structure of iButton:

9. Technology:
No internal power source required.
Energy is ‘stolen’ from the data line called parasitic power.
Needs connection to reader for power and data transfer.
A signaling protocol that can communicate bidirectionally using 1-
Wire protocol.

10. Electrical interface reduced to a minimum.
Transmission of information via the same
connection .
The data line is designed as an open drain output.

11. Block diagram of iButton:

12. Exterior of iButton:

13. Data Transfer:
Whenever the user pushes his iButton on a reader(Blue Dot Receptor),
the corresponding application such as updating ,data transfer etc.
It uses 1-wire protocol for communication with the host and the
iButton.
1-wire is the protocol can provide device communications with low
speed data,signal or power.

14. Information is transferred between your iButton and a PC with a
momentary contact at up to 142kbps.
A network with an associated master is called microlan.
One distinctive feature of the bus is the possibility to use only two
wires: data and ground

15. The Blue Dot receptor is cabled to a 1-Wire adapter that is attached to a
spare PC port.
Systems of sensors and actuators can be built by wiring together 1-Wire
components.
Each component contains all of the logic needed to operate on the 1-Wire
bus.

16. Each 1-Wire chip has a unique ID code.
This feature makes the chips, especially in an iButton package, suitable
for use as a key to open a lock, authenticate computer systems etc.
The Blue Dot receptor and 1-Wire Adapter are inexpensive.

17. Blue Dot Receptor… :
The Blue Dot Receptors are iButton reader/probes that provide a
convenient pipeline into the PC for iButton-to-PC communication.
The receptor's cable connects to a USB, serial, or parallel-port 1-Wire
adapter, whichever type of port you wish to use.
To accomplish this, 1-wire devices include an 800 pf capacitor to store
charge, and power the device during periods when the data line is
active.

18. Blue Dot Receptor… :

19. Special Features.. :
The silicon chip within the iButton is protected by the ultimate
durable material: stainless steel.
You can drop an iButton, step on it, or scratch it.
Water Proof and wide Temperature range.
The iButton is wear-tested for 10-year durability

20. Applications.. :
Access Control
Attendance
eCash
Thermochron Applications
Gaming Systems

21. Advantages.. :
A very easy and convenient way for users.
More secure than using passwords.
Portable and wearable.
Ruggedness ,Durable and WaterProof.

22. Other Advantages.. :
Clam-shell steel container, the Microcan is suitable for harsh
environments.
Programming using the same probe that reads it.
Smaller, lighter and less expensive.
Virtually no energy is needed to read information.
Reading/writing needs only a single I/O line of the computer

23. Disadvantages.. :
Parents and teachers will have less control
over children and students
Loss of privacy

24. A video on the Door lock application of iButton

25. Conclusion.. :
The iButton is an excellent solution for tracking monetary transactions.
Also mentioned the accuracy and usefulness
of iButtons for measuring temperature , eCash , Access control.
The main advantages are that the iButtons are wireless, suitable for long
measurement periods, sturdy, and easy to sterilize.
The software is user-friendly.
There are numerous other interesting applications as well!

26. References.. :
1)www.maxim-ic.com ›Products›iButton›Overview
2)www.maxim-ic.com/products/ibutton/applications/
3) www.wikipedia.org
4)whatis.techtarget.com
5)www.ibuttonlink.com
6)http://www.lothar.com/tech/iButtons/
7)http://www.dalsemi.com

28. THANK YOU