Electronics > Projects, Designs, and Technical Stuff
Thought this would be interesting to look at: The iButton 1Wire 64bit ROM
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Bobertsawesome:
I went to replace a battery in my AstroPhysics remote control and found what looked like another battery that would need replacing. To my shock, it wasn't a battery at all, in fact, it was a type of serial key/unique id system, all contained in what looked like a fat button cell. Doing some research on it, I found that this was pretty advanced for the time (MFG date 2004). I thought this would be interesting enough to share.

From the mfg:

--- Quote ---The DS1990A-F5+ provides a guaranteed unique ID in a small iButtonĀ® form. This iButton can be used as a key in access control systems, inventory control applications, work-in-progress tracking, or other applications that require a low-cost, reliable method of validating identification.
--- End quote ---




Note: These images below pertain to a different model of iButton, but probably the same construction.


https://www.cl.cam.ac.uk/~sjm217/projects/ibutton/
ArthurDent:
Around the mid 1990s the company I worked for used these to uniquely identify units on a production line. One of these was paired with each unit until it got through final test. They were then reused the next day.
coromonadalix:
Do i see a small coin cell inside the ibutton ?? i tought thes ibuttons had a parasite supply mode ?
todd_fuller:
Depends on the model. Some are just crypto authentication or unique serial numbers while others log temp, humidity, etc.
ale500:
I worked with them mid 90s, we had developed an application based on the DS1994, they had a lithium battery in them, because they had an RTC. They were called "Touch memories" in those times... Pretty neat devices with internal RAM and RTC and scratpads.
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