iButton Reader An iButtonTM is a chip housed in a stainless steel enclosure.
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iButton Reader Description

EditBy While I was searching in one of my junk boxes, I saw an old battery; at least it looked like a battery. After a close examination it turned out to be an "iButton" type number: DS1990A-F4, made by Dallas. After reading the PDF manuals on Internet, I decided to make a small interface with a Delphi program to see if the iButton was still Readable. Well, it works! The iButton An iButtonTM is a chip housed in a Stainless steel enclosure. The electrical interface is reduced to the absolute minimum, i.e., a single data line plus a ground reference. The energy needed for operation is "stolen" from the data line ("parasitic power"). The logical function of the DS1990A is a simple serial number. This globally unique registration number is common to all iButtons. For read operations all devices are satisfied with a 5kOhm pull-up resistor to supply energy and to terminate the 1-Wire bus.

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