DS90UB921TRHSRQ1

iButton
The DS1982 1Kb Add-Only iButton is a rugged read/write data carrier that identifies and stores relevant information about the product or person to which it is attached. This information can be accessed with minimal hardware, for example, a single port pin of a microcontroller.
The DS1982 consists of a factory lasered registration number that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family Code (09h) plus 1Kb of EPROM that is user-programmable.
The power to program and read the DS1982 is derived entirely from the 1-Wire communication line. Data is transferred serially via the 1-Wire protocol that requires only a single data lead and a ground return.
The entire device can be programmed and then write-protected if desired. Alternatively, the part may be programmed multiple times with new data being appended to, but not overwriting, existing data with each subsequent programming of the device.SPECIAL
FEATURES
• 1024 bits Electrically Programmable Read Only Memory (EPROM) communicates with the economy of one signal plus ground
• EPROM partitioned into four 256-bit pages for randomly accessing packetized data
• Each memory page can be permanently write protected to prevent tampering
• Device is an “add only” memory where additional data can be programmed into EPROM without disturbing existing data
• Architecture allows software to patch data by superseding an old page in favor of a newly programmed page
• Reduces control, address, data, power, and programming signals to a single data pin
• 8-bit family code specifies DS1982 communications requirements to reader
• Reads over a wide voltage range of 2.8V to 6.0V from -40°C to +85°C; programs at 11.5V to 12.0V from -40°C to +50°CCOMMON iButton
FEATURES
• Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
• Multidrop controller for MicroLAN
• Digital identification and information by momentary contact
• Chip-based data carrier compactly stores information
• Data can be accessed while affixed to object
• Economically communicates to bus master with a single digital signal at 16.3kbps
• Standard 16mm diameter and 1-Wire® protocol ensure compatibility with iButton® family
• Button shape is self-aligning with cup-shaped probes
• Durable stainless steel case engraved with registration number withstands harsh environments
• Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim
• Presence detector acknowledges when reader first applies voltage