DS1990R ibutton equivalent, serial number ibutton.
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* Upgrade of DS1990A Guarantees Presence Pulse on Contact Can be Read in Less Than 5ms Operating Range: 2.8V to 6.0V, -40°C to +85°C
COMMON iButton FEATU.
where a presence pulse on contact is critical the DS1990R should be preferred over the DS1990A.
SPECIAL FEATURES
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The DS1990R Serial Number iButton is a rugged data carrier that serves as an electronic registration number for automatic identification. Data is transferred serially through the 1-Wire protocol, which requires only a single data lead and a ground .
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