DS1921G Datasheet, PDF (1/45 Pages) Dallas Semiconductor – Thermochron iButton

www.maxim-ic.com
DS1921G
Thermochron iButton
SPECIAL FEATURES
ƒ Digital thermometer measures temperature in
0.5°C increments
ƒ Accuracy ±1°C from -30°C to +70°C. See EC
table for accuracy specification
ƒ Built-in real-time clock (RTC) and timer has
accuracy of ±2 minutes per month from 0°C
to 45°C
ƒ Water resistant or waterproof if placed inside
DS9107 iButton^® capsule (Exceeds Water
Resistant 3 ATM requirements)
ƒ Automatically wakes up and measures tem-
perature at user-programmable intervals from
1 to 255 minutes
ƒ Logs up to 2048 consecutive temperature
measurements in protected nonvolatile (NV)
random access memory
ƒ Records a long-term temperature histogram
with 2.0°C resolution
ƒ Programmable temperature-high and
temperature-low alarm trip points
ƒ Records up to 24 time stamps and durations
when temperature leaves the range specified
by the trip points
ƒ 512 bytes of general-purpose read/write NV
random access memory
ƒ Communicates to host with a single digital
signal at 15.4kbits or 125kbits per second
using 1-Wire^® protocol
ƒ Button shape is self-aligning with cup-shaped
probes
ƒ Durable stainless-steel case engraved with
registration number withstands harsh
environments
ƒ Easily affixed with self-stick adhesive
backing, latched by its flange, or locked with
a ring pressed onto its rim
ƒ Presence detector acknowledges when reader
first applies voltage
ƒ Meets UL#913 (4th Edit.). Intrinsically Safe
Apparatus: approved under Entity Concept
for use in Class I, Division 1, Group A, B, C
and D Locations
F5 MICROCAN
5.89
0.51
®
16.25
89
® 21
000000FBC52B
1-Wire^®
Thermochron^®
17.35
IO
GND
All dimensions are shown in millimeters.
COMMON iButton FEATURES
ƒ Digital identification and information by
momentary contact
ƒ Unique, factory-lasered and tested 64-bit reg-
istration number (8-bit family code + 48-bit
serial number + 8-bit CRC tester) assures ab-
solute traceability because no two parts are
alike
ƒ Multidrop controller for 1-Wire net
ƒ Chip-based data carrier compactly stores
information
ƒ Data can be accessed while affixed to object
ORDERING INFORMATION
DS1921G-F5 -40°C to +85°C F5 iButton
EXAMPLES OF ACCESSORIES
DS9096P
Self-Stick Adhesive Pad
DS9101
Multi-Purpose Clip
DS9093RA Mounting Lock Ring
DS9093A
Snap-In Fob
DS9092
iButton Probe
1-Wire, Microcan, and iButton are registered trademarks of
Dallas Semiconductor, Corp., a wholly owned subsidiary of
Maxim Integrated Products, Inc.
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