DS1971.PDF

DS1971

256-Bit EEPROM i Button

www.dalsemi.com

SPECIAL FEATURES

256-bit Electrically Erasable Programmable

Read Only Memory (EEPROM)

communicates with the economy of one

signal plus ground

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 i Button

family

EEPROM organized as one 256-bit page

64-bit one-time programmable application

programming

Button shape is self–aligning with cup-

shaped probes

Reduces control, address, data, power, and

programming signals to a single data pin

Durable stainless steel case engraved with

registration number withstands harsh

environments

8-bit family code specifies DS1971

communications requirements to reader

Easily affixed with self-stick adhesive

backing, latched by its flange, or locked with

a ring pressed onto its rim

Reads and writes over a wide voltage range

of 2.8V to 6.0V from -40°C to +85°C

Presence detector acknowledges when reader

first applies voltage

COMMON i Button FEATURES

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)

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

ORDERING INFORMATION

DS1971-F3

Digital identification and information by

momentary contact

F3 MicroCan

DS1971-F5

F5 MicroCan

Chip-based data carrier compactly stores

information

Data can be accessed while affixed to object

F3 MICROCAN TM

F5 MICROCAN TM

5.89

3.10

0.36

0.51

c 1993

16.25

c 1993

16.25

YYWW REGISTERED RR

D4 14

000000FBD8B3

YYWW REGISTERED RR

54 14

000000FBC52B

17.35

DATA

GROUND

All dimensions shown in millimeters.

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082099

DS1971

EXAMPLES OF ACCESSORIES

DS9096P

Self-Stick Adhesive Pad

DS9093F

Snap-in Fob

DS9101

Multi-Purpose Clip

DS9092

i Button Probe

DS9093RA

Mounting Lock Ring

i Button DESCRIPTION

The DS1971 256-bit EEPROM i Button 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 factory-lasered 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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