Rainbow Electronics DS1985 User Manual

Special features, Common ibutton features, F3 microcan

1 of 25

090299

SPECIAL FEATURES

§ 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 “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

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 16.3k bits per
second

§ Standard 16 mm 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

§ 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)

F3 MICROCAN

F5 MICROCAN

DS1985

16-kbit Add-Only iButton

www.dalsemi.com

DATA

GROUND

0.36

0.51

3.10

1993

YYWW REGISTERED RR

000000FBC52B

16.25

17.35

5.89