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Maxim Integrated Semiconductor Electronic Components Datasheet

DS1921G Datasheet

Thermochron iButton Device

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DS1921G
EVALUATION KIT AVAILABLE
Thermochron iButton Device
General Description
The Thermochron® iButton® device (DS1921G) 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 intervals ranging from 1 to 255min
can be stored. The histogram 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 out-
side the permitted range, and if the temperature was too
high or too low. An additional 512 bytes of battery-
backed SRAM allow 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 absolute traceability. The durable stainless
steel package is highly resistant to environmental haz-
ards such as dirt, moisture, and shock. Accessories per-
mit the DS1921G to be mounted on almost any object
including containers, 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 Can
DS1921G-F5N#
-40°C to +85°C F5 Can
#Denotes a RoHS-compliant device that 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.
Benefits and Features
High Accuracy, Full-Featured Digital Temperature
Logger Simplifies Temperature Data Collection and
Dissemination of Electronic Temperature Record
Accuracy ±1°C from -30°C to +70°C (See the
Electrical Characteristics for Accuracy Specification)
Digital Thermometer Measures Temperature in
0.5°C Increments
Built-In Real-Time Clock (RTC) and Timer Has
Accuracy of ±2 Minutes per Month from 0°C to +45°C
Automatically Wakes Up and Measures
Temperature at User-Programmable Intervals from
1 Minute to 255 Minutes
Logs Consecutive Temperature Measurements in
2kB of Datalog Memory
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
Individually Calibrated in a NIST-Traceable Chamber
Complies to Standard EN12830
512 Bytes of General-Purpose Battery-Backed SRAM
Rugged Construction Survives Harsh Environments
Water Resistant Enclosure (IP56) or Waterproof if
Placed Inside DS9107 iButton Capsule (Exceeds
Water Resistant 3 ATM Requirements)
CE, FCC, and UL913 Certifications
Simple Serial Port Interfaces to Most Microcontrollers
for Rapid Data Transfer
Communicates to Host with a Single Digital Signal
Up to 15.4kbps at Standard Speed or Up to
125kbps in Overdrive Mode Using 1-Wire Protocol
Common iButton Device Features appear at end of data
sheet.
19-5101; Rev 9; 3/15


Maxim Integrated Semiconductor Electronic Components Datasheet

DS1921G Datasheet

Thermochron iButton Device

No Preview Available !

DS1921G
Thermochron iButton Device
Absolute Maximum Ratings
IO Voltage Range Relative to GND ..........................-0.5V to +6V
IO Sink Current....................................................................20mA
Operating Temperature Range ..........................-40°C to +85°C*
Storage Temperature Range..............................-40°C to +50°C*
*Storage or operation above +50°C significantly reduces battery life.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
(VPUP = +2.8V to +5.25V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
IO PIN: GENERAL DATA
1-Wire Pullup Resistance
Input Capacitance
Input Load Current
High-to-Low Switching Threshold
(Notes 4, 6, 7, 8)
RPUP
CIO
IL
VTL
(Notes 1, 2)
(Notes 3, 4)
IO pin at VPUP (Note 5)
VPUP > 4.5V
Input Low Voltage
Low-to-High Switching Threshold
(Notes 4, 6, 7, 10)
VIL (Notes 1, 6, 9)
VTH VPUP > 4.5V
Output Low Voltage at 4mA
VOL (Notes 6, 11)
Standard speed, RPUP = 2.2k
Recovery Time (Notes 1, 4)
tREC
Overdrive speed, RPUP = 2.2k
Overdrive speed, directly prior to reset
pulse; RPUP = 2.2k
Time-Slot Duration (Notes 1, 12)
tSLOT
Standard speed
Overdrive speed
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
Reset Low Time (Notes 1,12)
Presence-Detect High
Time (Note 12)
Presence-Detect Low
Time (Note 12)
tRSTL
tPDH
tPDL
Standard speed, VPUP > 4.5V
Standard speed
Overdrive speed, VPUP > 4.5V
Overdrive speed
Standard speed
Overdrive speed
Standard speed
Overdrive speed, VPUP > 4.5V
Overdrive speed
Presence-Detect
Sample Time (Notes 1, 4)
tMSP
Standard speed
Overdrive speed
MIN TYP MAX UNITS
2.2
100 800
10
1.14 2.70
0.71 2.70
0.30
1.00 2.70
0.66 2.70
0.4
5
2
5
65
8
k
pF
μA
V
V
V
V
μs
μs
480 640
540 640
μs
48 80
58 80
15 60
μs
1.1 6
60 270
7.5 24 μs
7.5 32
60 75
μs
6 8.6
www.maximintegrated.com
Maxim Integrated | 2


Part Number DS1921G
Description Thermochron iButton Device
Maker Maxim Integrated
Total Page 30 Pages
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