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Status
Part Number	Status
DS1921H	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.
DS1921Z	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet

FULL DATA SHEET (PDF, 276kB) Download   E-Mail

Description

The DS1921H/Z Thermochron® iButtons® are rugged, self-sufficient systems that measure temperature and record 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 255 minutes can be stored. The histogram provides 64 data bins with a resolution of 0.5°C. If the temperature leaves a user-programmable range, the DS1921H/Z will also record when this happened, for how long the temperature stayed outside the permitted range, and if the temperature was too high or too low. Additional 512 bytes of read/write NV memory allow storing information pertaining to the object to which the DS1921H/Z is associated. Data is transferred serially via the 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1921H/Z 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 hazards such as dirt, moisture, and shock. Accessories permit the DS1921H/Z to be mounted on almost any object, including containers, pallets, and bags.

This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.

Key Features

Digital thermometer measures temperature 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 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 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

Key Specifications:  iButton Products

Part Number

Overview

Memory Type

Memory Size

Data Logger Type

Data Logger Size

Data Logger Sample Rate

Data Logger Histogram

Data Logger Accuracy

Data Logger Resolution

Data Logger Measuremt. Range

Prog. Alarm

Unique Ware

Real Time Clock

Smallest Available Pckg. (mm2)

Price

max w/pins

See Notes

DS1921H

Temperature Sensor iButton

NV SRAM

4Kbits

Temperature

2048 Byte

1min to 255min

64-bin

±1°C

0.125°C

+15°C to +46°C

Temperature High/Low

No

Yes

301

$14.25 @1k

DS1921Z

63-bin

-5°C to +26°C

$14.25 @1k

See All iButton Products (26)

Diagram

High Resolution Thermochron

Application Notes

Application Note 74: Reading and Writing 1-Wire® Devices Through Serial Interfaces - DS1921H, DS1921Z Application Note 155: 1-Wire® Software Resource Guide Device Description - DS1921H, DS1921Z Application Note 244: Advanced 1-Wire Network Driver - DS1921H, DS1921Z Application Note 1200: White Paper 7: Thermochron® Mission Authentication and Security - DS1921H, DS1921Z Application Note 3808: What Is an iButton? - DS1921H, DS1921Z Application Note 3809: Exporting DS192x Logger Data from the OneWireViewer into Excel - DS1921H, DS1921Z Application Note 3892: Overview of iButton Sensors and Temperature/Humidity Dataloggers - DS1921H, DS1921Z Application Note 4126: Understanding the IP (Ingress Protection) Ratings of iButton Data Loggers and Capsule - DS1921H, DS1921Z Application Note 4477: Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V - DS1921H, DS1921Z

Design Guides

1-Wire® Products (PDF)

Reliability Reports

Reliability Report: DS1921H.pdf Request Reliability Report for: DS1921Z

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-9 of 9

DS1921H	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1921H+F50			N/A	No Longer Available		CAN-F5;2 pin;301 mm² Outline Drawing: 21-0266 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB#5CP*	0°C to +70°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1921H-F5+A1C			N/A	No Longer Available		Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1921H-F5/A1C			N/A	No Longer Available	DS1921H-F5#A1C	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1921H-F5#				Active		CAN-F5;2 pin;301 mm² Outline Drawing: 21-0266 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB#5CP*	Special - See Data Sheet	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1921H-F50	F5 MicroCan		N/A	No Longer Available	DS1921H-F5#	Land Pattern: Not Available	Special - See Data Sheet	See data sheet
DS1921Z	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1921Z+F50			N/A	No Longer Available		CAN-F5;2 pin;301 mm² Outline Drawing: 21-0266 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB#5CP*	0°C to +70°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1921Z-F5+A1D			N/A	No Longer Available		Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1921Z-F5#				Active		CAN-F5;2 pin;301 mm² Outline Drawing: 21-0266 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB#5CP*	Special - See Data Sheet	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1921Z-F50	F5 MicroCan		N/A	No Longer Available	DS1921Z-F5#	Land Pattern: Not Available	Special - See Data Sheet	See data sheet

More Information

New Product Press Release 2002-02-04  Evaluation Kit: DS1921K

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