DS1982

DS1982 1-kbit Add-Only iButtonTM www.iButton.com SPECIAL FEATURES 1024 bits Electrically Programmable ReadOnly Memory (EPROM) communicates with the economy of one signal plus ground EPROM partitioned into four 256-bit pages www.DataSheet4U.com 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°C 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 16.3 kbits per second Standard 16 mm diameter and 1-Wire® protocol ensure compatibility with iButton family Button shape is self-aligning with cupshaped 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...