Document
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 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)
COMMON 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
F3 MICROCAN
3.10 0.36 0.51
c 1993
F5 MICROCAN
5.89 0.36
16.25
0.51
c 1993
16.25
YYWW REGISTERED RR
YYWW REGISTERED RR
97
09
17.35
17
09
17.35
000000FBC52B
000000FBD8B3
DATA GROUND
DATA GROUND
All dimensions shown in millimeters. 1 of 23 011800
DS1982
ORDERING INFORMATION
DS1982-F3 DS1982-F5 F3 MicroCan F5 MicroCan
EXAMPLES OF ACCESSORIES
DS9096P DS9101 DS9093RA DS9093F DS9092 Self-Stick Adhesive Pad Multi-Purpose Clip Mounting Lock Ring Snap-In Fob iButton Probe
iButton DESCRIPTION
The DS1982 1-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 DS1982 consists of a factorywww.DataSheet4U.com lasered registration number that includes an unique 48-bit serial number, an 8–bit CRC, and an 8-bit Family Code (09h) plus 1 kbit of EPROM which 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 1Wire protocol which 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. Note: Individual bits can be changed only from a logical 1 to a logical 0, never from a logical 0 to a logical 1. A provision is also included for indicating that a certain page or pages of data are no longer valid and have been replaced with new or updated data that is now residing at an alternate page address. This page address redirection allows software to patch data and enhance the flexibility of the device as a standalone database. The 48-bit serial number that is factory-lasered into each DS1982 provides a guaranteed unique identity which allows for absolute traceability. 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 DS1982 to be used easily by human operators or automatic equipment. Accessories permit the DS1982 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, storage of calibration constants, and debit tokens.
OVERVIEW
The block diagram in Figure 1 shows the relationships between the major control and memory sections of the DS1982. The DS1982 has three main data components: 1) 64-bit lasered ROM, 2) 1024-bit EPROM, and 3) EPROM Status Bytes. The device derives its power for read operations entirely from the 1-Wire communication line by storing energy on an internal capacitor during periods of time when the signal line is high and continues to operate off of this “parasite” .