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| DS1981U/DS1982U DS1981U/DS1982U UniqueWareTM iButtonTM SPECIAL FEATURES * 512 bits (DS1981U) or 1024 bits (DS1982U) Electrically Programmable Read Only Memory (EPROM) communicates with the economy of one signal plus ground Unique, factory lasered and tested 64-bit registration number (8-bit family code, 36-bit serialization, 12-bit UniqueWareTM Identifier 5E7H, 8-bit CRC tester) assures absolute traceability because no two parts are alike. Family code 91H for the DS1981U, 89H for the DS1982U EPROM partitioned into two (DS1981U) or four (DS1982U) 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 Reduces control, address, data, power and programming signals to a single pin 8-bit family code specifies DS1981U or DS1982U communications requirements to reader Reads over a wide voltage range of 2.8V to 6.0V from -40C to +85C; programs at 11.5V to 12.0V from -40C to + 50C COMMON iButton FEATURES * Multidrop controller for MicroLANTM * Digital identification and information * * * * Economically * * * * * * by momentary contact Chip-based data carrier compactly stores information Data can be accessed while affixed to object communicates to bus master with a single digital signal at 16.3k bits per second Standard 16 mm 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 Meets UL#913 (4th edit.); Intrinsically Safe Apparatus, Approved under Entity Concept for use in Class I, Division 1, Group A, B, C and D Locations (application pending) * * * * * * iButton DESCRIPTION The DS1981U and DS1982U are factory programmed versions of the DS1982 1K-bit Add-Only iButton. They differ from the standard DS1982 in their custom ROM family code 91H (DS1981U) and 89H (DS1982U) respectively, and the UniqueWareTM Identifier 5E7 in place of the upper 12 bits of the standard serialization field. With the DS1981U the upper two memory pages are not accessible; they always read FFH and cannot be programmed. Otherwise, the electrical and logical behavior is identical to that of the DS1982. For technical details please refer to the DS1982 data sheet. The DS1981U and DS1982U are only available preprogrammed with customer specific and write-protected UniqueWareTM data. Memory pages not used for UniqueWareTM data can be programmed in the application. For more details on UniqueWareTM, please refer to the UniqueWareTM Project Setup Manual, available as Application Note 99 from Dallas Semiconductor. YYWW REGISTERED RR F2 2U 89 5E7000FBD8B3 DATA GROUND MSB DS1981U DS1982U BYTES CRC CRC 1 5E7 5E7 11/2 SERIAL # SERIAL # 41/2 LSB 91H 89H 1 ORDERING INFORMATION DS1981U-F5 DS1982U-F5 DS1981U-F3 DS1982U-F3 F5 MicroCan F5 MicroCan F3 MicroCan F3 MicroCan 072498 1/1 |
Price & Availability of DS1982U
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