19-4889; Rev 8/09
DS1973
4Kb EEPROM iButton
SPECIAL FEATURES
4096 bits Electrically Erasable Programmable
Read Only Memory (EEPROM)
Overdrive mode boosts communication speed
to 142kbps
256-bit scratchpad ensures integrity of data
transfer
Memory partitioned into 256-bit pages for
packetizing data
Reduces control, address, data and power to a
single data pin
8-bit family code specifies DS1973
communication requirements to reader
Reads and writes over a wide voltage range of
2.8V to 6.0V from -40°C to +85°C
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 16.3kbps
Standard 16mm 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
F3 MicroCan
F5 MicroCan
ORDERING INFORMATION
PART
PIN-PACKAGE
DS1973-F3+
F3 MicroCan
DS1973-F5+
F5 MicroCan
+
Denotes a lead(Pb)-free/RoHS-compliant package
.
EXAMPLES OF ACCESSORIES
DS9096P
DS9101
DS9093RA
DS9093A
DS9092
Self-Stick Adhesive Pad
Multi-Purpose Clip
Mounting Lock Ring
Snap-In Fob
iButton Probe
iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.
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DS1973
iButton DESCRIPTION
The DS1973 4Kb 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. For a full description of the logical
behavior, please refer to the DS2433 data sheet.
DS1973 BLOCK DIAGRAM
Figure 1
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DS1973
REVISION HISTORY
REVISION
DATE
071508
DESCRIPTION
Updated the
F3 MicroCan
and
F5 MicroCan
face brands with the latest
per PCN H020201.
Added the + sign to the PART numbers in the
Ordering Information
table, indicating lead(Pb)-free/RoHS-compliant packages.
Removed the UL#913 bullet from the
Common iButton Features
section.
PAGES
CHANGED
1
1
1
8/09
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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. Maxim cannot assume responsibility for use of
any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and
specifications without notice at any time.
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© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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