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DS1985 Datasheet

  • DS1985

  • 16-kbit Add-Only iButtonTM

  • 440.85KB

  • Dallas   Dallas

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DS1985
16-kbit Add-Only iButton
TM
www.dalsemi.com
SPECIAL FEATURES
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16384 bits Electrically Programmable Read
Only Memory (EPROM) communicates with
the economy of one signal plus ground
EPROM partitioned into sixty-four 256-bit
pages for randomly accessing packetized
data records
Each memory page can be permanently
write-protected to prevent tampering
Device is an 鈥渁dd only鈥?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擄C to +85擄C; programs at
11.5V to 12.0V from -40擄C to +85擄C
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
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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 16.3k bits per
second
Standard 16 mm diameter and 1-Wire
TM
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
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)
COMMON iButton FEATURES
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F3 MICROCAN
TM
3.10
0.36
0.51
c
1993
F5 MICROCAN
TM
5.89
0.36
16.25
0.51
c
1993
16.25
YYWW REGISTERED RR
YYWW REGISTERED RR
ED
0B
17.35
6D
0B
17.35
000000FBC52B
000000FBD8B3
DATA
GROUND
DATA
GROUND
All dimensions shown in millimeters.
1 of 25
090299

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DS1985-F3,DS1985-F5

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