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050200
SPECIAL FEATURES
4096 bits Electrically Erasable
Programmable Read Only Memory
(EEPROM)
Overdrive mode boosts communication
speed to 142 kbits per second
256bit scratchpad ensures integrity of data
transfer
Memory partitioned into 256bit pages for
packetizing data
Reduces control, address, data and power to
a single data pin
8bit family code specifies DS1973
communication requirements to reader
Reads and writes over a wide voltage range
of 2.8V to 6.0V from 40C to +85C
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 identity because no two
parts are alike
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 1Wire
protocol ensure compatibility with iButton
family
Button shape is selfaligning with cup
shaped probes
Durable stainless steel case engraved with
registration number withstands harsh
environments
Easily affixed with selfstick 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 (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
DS1973-F3
F3 MicroCan
DS1973-F5
F5 MicroCan
F3 MICROCAN
F5 MICROCAN
DS1973
4-kbit EEPROM iButton
TM
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.
DS1973
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EXAMPLES OF ACCESSORIES
DS9096P
SelfStick Adhesive Pad
DS9101 MultiPurpose
Clip
DS9093RA Mounting
Lock
Ring
DS9093A SnapIn
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 48bit serial number, an 8bit CRC, and an 8bit
Family Code (23H) plus 4096 bits of EEPROM. The power to program and read the DS1973 is derived
entirely from the 1Wire communication line. The memory is organized as sixteen pages of 256 bits
each. The 64bit registration number provides a guaranteed unique identity which allows for absolute
traceability. Data is transferred serially via the 1Wire 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 buttonshaped profile is selfaligning with cupshaped 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, photoID badges, ID bracelets, and
many other objects. Applications include workinprogress 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) 64bit lasered ROM, 2) 256bit
scratchpad, and 3) 4096bit 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
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