DS1985 Datasheet, PDF (1/26 Pages) Dallas Semiconductor – 16-kbit Add-Only iButton

19-4892; Rev 8/09
SPECIAL FEATURES
 16384 bits Electrically Programmable Read Only
Memory (EPROM) communicates with the
economy of one signal plus ground
 EPROM partitioned into 64 256-bit pages for
randomly accessing packetized data records
 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 DS1985
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 +85°C
F3 MicroCan
F5 MicroCan
DS1985
16Kb Add-Only iButton
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
 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
ORDERING INFORMATION
PART
PIN-PACKAGE
DS1985-F3+
F3 MicroCan
DS1985-F5+
F5 MicroCan
+Denotes a lead(Pb)-free/RoHS-compliant package.
EXAMPLES OF ACCESSORIES
DS9096P
Self-Stick Adhesive Pad
DS9101
Multi-Purpose Clip
DS9093RA
Mounting Lock Ring
DS9093F
Snap-In Fob
DS9092
iButton Probe
iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.
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