Maxim DS1971-F3+ 256-bit eeprom ibuttonâ® Datasheet

19-4734; 7/09
DS1971
256-Bit EEPROM iButton®
www.maxim-ic.com
SPECIAL FEATURES
COMMON iButton FEATURES
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256-bit Electrically Erasable Programmable
Read Only Memory (EEPROM)
communicates with the economy of one
signal plus ground
EEPROM organized as one 256-bit page
64-bit one-time programmable application
register is automatically write-protected after
programming
Reduces control, address, data, power, and
programming signals to a single data pin
8-bit family code specifies DS1971
communications requirements to reader
Reads and writes over a wide voltage range
of 2.8V to 6.0V from -40°C to +85°C
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F3 MicroCan
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Unique, factory-lasered and tested 64-bit
registration number (8-bit family code + 48bit serial number + 8-bit CRC tester) assures
absolute traceability 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 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
ORDERING INFORMATION
DS1971-F3+
DS1971-F5+
F5 MicroCan
F3 MicroCan
F5 MicroCan
+Denotes a lead(Pb)-free/RoHS-compliant package.
EXAMPLES OF ACCESSORIES
DS9096P
DS9101
DS9093RA
DS9093F
DS9092
iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.
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Self-Stick Adhesive Pad
Multi-Purpose Clip
Mounting Lock Ring
Snap-in Fob
iButton Probe
DS1971
iButton DESCRIPTION
The DS1971 256-bit 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 microcontroller. The DS1971 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 (14H) plus 256 bits of EEPROM. The power to program and read the DS1971 is
derived entirely from the 1-Wire communication line. Data is transferred serially via the 1-Wire protocol
which requires only a single data lead and a ground return. The 48-bit serial number that is factorylasered into each DS1971 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
DS1971 to be used easily by human operators or automatic equipment. Accessories permit the DS1971 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 DS1971. The DS1971 has four main data components: 1) 64-bit lasered ROM, 2) 256-bit EEPROM
data memory with scratchpad, 3) 64-bit one-time programmable application register with scratchpad, and
4) 8-bit status memory. 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 DS1971 contains the same memory chip as the DS2430A. For a full description of the logical
behavior, please refer to the DS2430A data sheet.
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DS1971
DS1971 BLOCK DIAGRAM Figure 1
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DS1971
REVISION HISTORY
REVISION
DATE
071508
7/09
DESCRIPTION
PAGES
CHANGED
Updated the F3 MicroCan and F5 MicroCan face brands with the latest
per PCN H020201.
Conversion to lead(Pb)-free; removal of bullet “Designed to meet
UL#913 (4th Edit.)….”
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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
The Maxim logo is a registered trademark of Maxim Integrated Products, Inc.
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