DS1972_10 Datasheet, PDF (1/23 Pages) Maxim Integrated Products – 1024-Bit EEPROM iButton

19-4888; Rev 3; 4/10
1024-Bit EEPROM iButton
General Description
The DS1972 is a 1024-bit, 1-Wire^® EEPROM chip orga-
nized 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 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
Examples of Accessories
PART
DS9096P
DS9101
DS9093RA
DS9093A
DS9092
ACCESSORY
Self-Stick Adhesive Pad
Multipurpose Clip
Mounting Lock Ring
Snap-In Fob
iButton Probe
Pin Configurations
F3 SIZE
3.10mm
0.51mm
F5 SIZE
5.89mm
0.51mm
BRANDING
u ^{t t o n®. c}
16.25mm
52
® 2D
0000006234FB
1-Wire^®
WW _{ZZZ DS1972}
17.35mm
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
PART
TEMP RANGE PIN-PACKAGE
DS1972-F5+
-40°C to +85°C F5 iButton
DS1972-F3+
-40°C to +85°C F3 iButton
+Denotes a lead(Pb)-free/RoHS-compliant package.
IO
GND
IO
GND
1-Wire and iButton are registered trademarks of Maxim
Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
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.