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Identity iButtons

iButtons of this type are used to identity items or people. Like all iButtons they have a unique 64bit serial number but they have no additional functions
DS1990A-F5+ ROM (identity) iButton

DS1990A-F5+ ROM (identity) iButton
DS1990R-F5# ROM iButton (with presence pulse)

DS1990R-F5# ROM iButton (with presence pulse)
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DS1990A-F3+ ROM (identity) iButton (old stock)

DS1990A-F3+ ROM (identity) iButton (old stock)