DS1921G_1109 Datasheet, PDF (1/42 Pages) Maxim Integrated Products – Thermochron iButton

19-5101; Rev 5; 9/11
Thermochron iButton
General Description
The DS1921G Thermochron^® iButton^® is a rugged, self-
sufficient system that measures temperature and records
the result in a protected memory section. The recording
is done at a user-defined rate, both as a direct storage of
temperature values as well as in the form of a histogram.
Up to 2048 temperature values taken at equidistant inter-
vals ranging from 1 to 255min can be stored. The his-
togram provides 63 data bins with a resolution of 2.0°C.
If the temperature leaves a user-programmable range,
the DS1921G also records when this happened, for how
long the temperature stayed outside the permitted range,
and if the temperature was too high or too low. An addi-
tional 512 bytes of read/write nonvolatile (NV) memory
allows storing information pertaining to the object to
which the DS1921G is associated. Data is transferred
serially through the 1-Wire^® protocol, which requires only
a single data lead and a ground return. Every DS1921G
is factory lasered with a guaranteed unique, electrically
readable, 64-bit registration number that allows for abso-
lute traceability. The durable stainless steel package is
highly resistant to environmental hazards such as dirt,
moisture, and shock. Accessories permit the DS1921G
to be mounted on almost any object including contain-
ers, pallets, and bags.
Applications
Temperature Logging in Cold Chain, Food Safety,
Pharmaceutical, and Medical Products
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS1921G-F5#
-40°C to +85°C
F5 iButton
DS1921G-F5N#
-40°C to +85°C
F5 iButton
#Denotes a RoHS-compliant device that may include lead(Pb)
that is exempt under the RoHS requirements.
A NIST traceability certificate is available for the DS1921G-F5N.
See Application Note 4629 for details.
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 Configuration appears at end of data sheet.
Thermochron, iButton, and 1-Wire are registered trademarks of
Maxim Integrated Products, Inc.
Features
♦ Digital Thermometer Measures Temperature in
0.5°C Increments
♦ Accuracy ±1°C from -30°C to +70°C (See the
Electrical Characteristics for Accuracy
Specification)
♦ Built-In Real-Time Clock (RTC) and Timer Has
Accuracy of ±2 Minutes per Month from 0°C to +45°C
♦ Water Resistant or Waterproof if Placed Inside
DS9107 iButton Capsule (Exceeds Water
Resistant 3 ATM Requirements)
♦ Automatically Wakes Up and Measures Temperature
at User-Programmable Intervals from 1 Minute to
255 Minutes
♦ Logs Up to 2048 Consecutive Temperature
Measurements in Protected NV RAM
♦ Records a Long-Term Temperature Histogram
with 2.0°C Resolution
♦ Programmable Temperature High and
Temperature Low Alarm Trip Points
♦ Records Up to 24 Timestamps and Durations
When Temperature Leaves the Range Specified
by the Trip Points
♦ 512 Bytes of General-Purpose Read/Write NV RAM
♦ Communicates to Host with a Single Digital Signal
at 15.4kbps or 125kbps Using 1-Wire Protocol
Common iButton Features
♦ Digital Identification and Information by
Momentary Contact
♦ 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 1-Wire Net
♦ Chip-Based Data Carrier Compactly Stores Information
♦ Data Can Be Accessed While Affixed to Object
♦ 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, 5th Ed., Rev. 1997-02-24; Intrinsically
Safe Apparatus: Approved Under Entity Concept for
Use in Class I, Division 1, Group A, B, C, and D
Locations
________________________________________________________________ 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.