DS1973 DALLAS | Alldatasheet
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Technical content
/elevenoclock 4096 bits Electrically Erasable Programmable Read Only Memory (EEPROM) /elevenoclock Overdrive mode boosts communication speed to 142 kbits per second /elevenoclock 256–bit scratchpad ensures integrity of data transfer /elevenoclock Memory partitioned into 256–bit pages for packetizing data /elevenoclock Reduces control, address, data and power to a single data pin /elevenoclock 8–bit family code specifies DS1973 communication requirements to reader /elevenoclock Reads and writes over a wide voltage range of 2.8V to 6.0V from –40°C to +85°C COMMON iButton FEATURES /elevenoclock Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute identity because no two parts are alike /elevenoclock Multidrop controller for MicroLAN /elevenoclock Digital identification and information by momentary contact /elevenoclock Chip-based data carrier compactly stores information /elevenoclock Data can be accessed while affixed to object /elevenoclock Economically communicates to bus master with a single digital signal at 16.3 kbits per second /elevenoclock Standard 16 mm diameter and 1–Wire protocol ensure compatibility with iButton family /elevenoclock Button shape is self–aligning with cup– shaped probes /elevenoclock Durable stainless steel case engraved with registration number withstands harsh environments /elevenoclock Easily affixed with self–stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim /elevenoclock Presence detector acknowledges when reader first applies voltage /elevenoclock Meets UL#913 (4 th Edit.); Intrinsically Safe Apparatus, Approved under Entity Concept for use in Class I, Division 1, Group A, B, C and D Locations (application pending)
ORDERING INFORMATION
www.iButton.com DATA GROUND 0.36 0.51 3.10 c 1993 YYWW REGISTERED RR F3 23 000000FBC52B 16.25 17.35 DATA GROUND 0.36 0.51 5.89 c 1993 YYWW REGISTERED RR 73 23 000000FBD8B3 16.25 17.35 All dimensions shown in millimeters.
DS9096P Self–Stick Adhesive Pad DS9101 Multi–Purpose Clip DS9093RA Mounting Lock Ring DS9093A Snap–In Fob DS9092 iButton Probe iButton DESCRIPTION The DS1973 4-kbit EEPROM 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 micro-controller. The DS1973 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 (23H) plus 4096 bits of EEPROM. The power to program and read the DS1973 is derived entirely from the 1–Wire communication line. The memory is organized as sixteen pages of 256 bits each. The 64–bit registration number provides a guaranteed unique identity which allows for absolute traceability. Data is transferred serially via the 1–Wire protocol which requires only a single data lead and a ground return. The durable MicroCan package is highly resistant to harsh environments such as dirt, moisture, and shock. Its compact button–shaped profile is self–aligning with cup–shaped receptacles, allowing the DS1973 to be used easily by human operators or automatic equipment. Accessories permit the DS1973 to be mounted on printed circuit boards, plastic key fobs, photo–ID badges, ID bracelets, and many other objects. Applications include work–in–progress tracking, electronic travelers, access control and storage of calibration constants. OVERVIEW The block diagram in Figure 1 shows the relationships between the major control and memory sections of the DS1973. The DS1973 has three main data components: 1) 64–bit lasered ROM, 2) 256–bit scratchpad, and 3) 4096–bit EEPROM. The bus master must first provide one of the ROM function commands before the memory functions become accessible. All data is read and written least significant bit first. The DS1973 contains the same memory chip as the DS2433-Z01 (with 10000 write/erase cycles). For a full description of the logical behavior, please refer to the DS2433-Z01 data sheet. DS1973 BLOCK DIAGRAM Figure 1