1024-Bit EEPROM iButton

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Maxim Integrated Products

1

19-4888; Rev 3; 4/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

nized as four memory pages of 256 bits each in a

scratchpad, verified, and then copied to the EEPROM

memory. As a special feature, the four memory pages

can individually be write protected or put in EPROM-

emulation mode, where bits can only be changed from

a 1 to a 0 state. The DS1972 communicates over the

single-conductor 1-Wire bus. The communication fol-

lows the standard 1-Wire protocol. Each device has its

own unalterable and unique 64-bit ROM registration

number that is factory lasered into the device. The reg-

istration number is used to address the device in a mul-

tidrop, 1-Wire net environment.

Applications

Access Control/Parking Meter

Work-in-Progress Tracking

Tool Management

Inventory Control

Maintenance/Inspection Data Storage

Features

♦ 1024 Bits of EEPROM Memory Partitioned Into

Four Pages of 256 Bits

♦ Individual Memory Pages Can Be Permanently

Write Protected or Put in EPROM-Emulation Mode

(“Write to 0”)

♦ Switchpoint Hysteresis and Filtering to Optimize

Performance in the Presence of Noise

♦ IEC 1000-4-2 Level 4 ESD Protection (±8kV

Contact, ±15kV Air, Typical)

♦ Reads and Writes Over a Wide Voltage Range

from 2.8V to 5.25V from -40°C to +85°C

♦ Communicates to Host with a Single Digital

Signal at 15.4kbps or 125kbps Using 1-Wire

Protocol

Common iButton Features

♦ Unique Factory-Lasered 64-Bit Registration

Number Ensures Error-Free Device Selection and

Absolute Traceability Because No Two Parts are

Alike

♦ Built-In Multidrop Controller for 1-Wire Net

♦ Chip-Based Data Carrier Stores Digital

Identification and Information, Armored in a

Durable Stainless-Steel Case

♦ Data Can Be Accessed While Affixed to Object

♦ Button Shape is Self-Aligning with Cup-Shaped

Probes

♦ 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

16.25mm

5.89mm

0.51mm

3.10mm

0.51mm

17.35mm

BRANDING

F5 SIZE

GND

GND

IO

IO

F3 SIZE

52

2D

0000006234FB

®

u t

t o n

W

W

ZZZ DS197

2

Pin Configurations

+

Denotes a lead(Pb)-free/RoHS-compliant package.

PART

TEMP RANGE

PIN-PACKAGE

DS1972-F5+

-40°C to +85°C

F5 iButton

DS1972-F3+

-40°C to +85°C

F3 iButton

Examples of Accessories

PART

ACCESSORY

DS9096P

Self-Stick Adhesive Pad

DS9101

Multipurpose Clip

DS9093RA

Mounting Lock Ring

DS9093A

Snap-In Fob

DS9092

iButton Probe

1-Wire and iButton are registered trademarks of Maxim

Integrated Products, Inc.