DS1972 Datasheet, PDF (1/23 Pages) Maxim Integrated Products – 1024-Bit EEPROM iButton

DS1972
1024-Bit EEPROM iButton
www.maxim-ic.com
iButton DESCRIPTION
The DS1972 is a 1024-bit, 1-Wire^® EEPROM
organized as four memory pages of 256 bits each in
a rugged iButton package. Data is written to an 8-
byte 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 follows the standard Dallas
Semiconductor 1-Wire protocol. Each device has its
own unalterable and unique 64-bit ROM registration
number that is factory lasered into the device. The
registration number is used to address the device in
a multidrop 1-Wire net environment.
APPLICATIONS
Access Control/Parking Meter
Work-In-Progress Tracking
Tool Management
Inventory Control
Maintenance/Inspection Data Storage
F5 AND F3 MicroCAN
F3 size F5 size
3.10
5.89
0.51
0.51
Branding
â
16.25
51
â 2D
0000006234FB
1-Wire^â
17.35
IO GND IO GND
Commands, Registers, and Modes are capitalized for
clarity.
IButton, 1-Wire, and MicroCAN are registered trademarks of Dallas
Semiconductor Corp.
SPECIAL 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 of
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 Assures 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 Identifi-
cation 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
§ Designed to meet UL#913 (4th Edit.); Intrinsically
Safe Apparatus: Under Entity Concept for use in
Class I, Division 1, Group A, B, C, and D
Locations, contact Dallas Semiconductor for
certification schedule
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS1972-F5#
-40°C to 85°C F5 iButton
DS1972-F3#
-40°C to 85°C F3 iButton
# indicates RoHS complience
Contact factory lead-free compliance
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 083006