先简单介绍下DS1982芯片的特征：
SPECIAL FEATURES
ß   1024 bits Electrically Programmable Read-Only Memory (EPROM) communicates with
the economy of one signal plus ground
ß   EPROM partitioned into four 256-bit pages
for randomly accessing packetized data
ß   Each memory page can be permanently
write-protected to prevent tampering
ß   Device is an “ add only” memory where
additional data can be programmed into
EPROM without disturbing existing data
ß   Architecture allows software to patch data by
superseding an old page in favor of a newly
programmed page
ß   Reduces control, address, data, power, and
programming signals to a single data pin
ß   8-bit family code specifies DS1982
communications requirements to reader
ß   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
COMMON iButton FEATURES
ß   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
ß   Multidrop controller for MicroLAN
ß   Digital identification and information by
momentary contact
ß   Chip-based data carrier compactly stores
information
ß   Data can be accessed while affixed to object
ß   Economically communicates to bus master
with a single digital signal at 16.3k bits per
second
ß   Standard 16 mm diameter and 1-Wire
TM
protocol ensure compatibility with iButton
family
ß   Button shape is self-aligning with cup-shaped probes
ß   Durable stainless steel case engraved with
registration number withstands harsh
environments
ß   Easily affixed with self-stick adhesive
backing, latched by its flange, or locked with
a ring pressed onto its rim
ß   Presence detector acknowledges when reader
first applies voltage
ß   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)
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