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DS1985 Datasheet PDF

Dallas Semiconductor DS1985

The DS1985 16-kbit 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 DS1985 consists of a factory-lasered registration number that includes a unique 48-bit serial number, an 8-bit CRC, and an 8bit Family Code (0BH) plus 16k bit of EPROM which is user-programmable. The power to program and read the DS1985 is derived entirely from the 1-Wire communication line.
Part No. DS1985
Datasheet DS1985 Download
Manufacturer
Dallas Semiconductor
Description 16-kbit Add-Only iButton
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DS1985 datasheet page 1 preview

FEATURES

16384 bits Electrically Programmable Read Only Memory (EPROM) communicates with the economy of one signal plus ground § EPROM partitioned into sixty-four 256-bit pages for randomly accessing packetized data records § 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 DS1985 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 +85°C § § § § § § § § § § § § Multidrop controller for MicroLAN Digital identification and information by momentary contact Chip-based data carrier compactly stores information Data can be accessed while...
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