DS1921H Datasheet, PDF (1/45 Pages) Maxim Integrated Products – High-Resolution Thermochron iButton

19-4887; Rev 8/09
DS1921H/DS1921Z
High-Resolution Thermochron® iButton®
Range H: +15°C to +46°C, Z: -5°C to +26°C
SPECIAL FEATURES
 Digital thermometer measures temperature in
1/8°C increments with ±1°C accuracy
 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 to 255 minutes
 Logs up to 2048 consecutive temperature
measurements in protected nonvolatile (NV)
random access memory
 Records a long-term temperature histogram
with 1/2°C resolution
 Programmable temperature-high and
temperature-low alarm trip points
 Records up to 24 time stamps and durations
when temperature leaves the range specified
by the trip points
 512 bytes of general-purpose read/write NV
random access memory
 Communicates to host with a single digital
signal at 15.4kbits or 125kbits per second
using 1-Wire^® protocol
 Fixed range: H: +15°C to +46°C;
Z: -5°C to +26°C
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
F5 MICROCAN
5.89
0.51

16.25
D6
 21
3B2000FBC52B
1-Wire^
Thermochron^®
17.35
IO
GND
All dimensions are shown in millimeters.
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS1921H-F5# +15°C to +46°C F5 iButton
DS1921Z-F5# -5°C to +26°C F5 iButton
#Denotes a RoHS-compliant device that may include lead(Pb) that is
exempt under the RoHS requirements.
EXAMPLES OF ACCESSORIES
DS9096P
Self-Stick Adhesive Pad
DS9101
Multi-Purpose Clip
DS9093RA Mounting Lock Ring
DS9093A
Snap-In Fob
DS9092
iButton Probe
Thermochron, iButton, and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.
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