DS1921H_11 datasheet, PDF - EEWORLD Datasheet

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DS1921H_11: DescriptionHigh-Resolution Thermochron iButton; File Size673KB，45 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1921H_11 Overview

High-Resolution Thermochron iButton

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19-4887; Rev 12/11

SPECIAL FEATURES



DS1921H/DS1921Z

High-Resolution Thermochron® iButton®

Range H: +15°C to +46°C, Z: -5°C to +26°C



COMMON iButton 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

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

PIN CONFIGURATION

5.89

0.51



16.25

3B2000FBC52B



Thermochron



17.35

1-Wire

GND

All dimensions are shown in millimeters.

ORDERING INFORMATION

PART

DS1921H-F5#

DS1921Z-F5#

TEMP RANGE

+15°C to +46°C

-5°C to +26°C

PIN-PACKAGE

F5 iButton

#Denotes a RoHS-compliant device that may include lead(Pb) that is

exempt under the RoHS requirements.

EXAMPLES OF ACCESSORIES

DS9096P

DS9101

DS9093RA

DS9093A

DS9092

Self-Stick Adhesive Pad

Multi-Purpose Clip

Mounting Lock Ring

Snap-In Fob

iButton Probe



Thermochron, iButton, and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.

1 of 45

DS1921H/Z

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.

The DS1921Z is an ideal device to monitor the temperature of any object it is attached to or shipped with,

such as fresh produce, medical drugs and supplies. It is also ideal for use in refrigerators. The DS1921H

is intended for monitoring the body temperature of humans and animals and for monitoring temperature

critical processes such as curing, powder coating, and painting. Alternatively, the DS1921H can be used

for monitoring the temperature of clean rooms, and computer and equipment rooms. It can also aid in

calculating the proportional share of heating cost of each party in buildings with central heating. The

DS1921H has a fixed range of +15°C to +46°C. The DS1921Z has a fixed range of -5°C to +26°C. The

high resolution makes the DS1921H and DS1921Z suitable for scientific research and development. The

read/write NV memory can store information such as shipping manifests, dates of manufacture, or other

relevant data written as ASCII or encrypted files. Note that the initial sealing level of DS1921H/Z

achieves the equivalent of IP56. Aging and use conditions can degrade the integrity of the seal over time,

so for applications with significant exposure to liquids, sprays, or other similar environments, it is

recommended to place the Thermochron in the DS9107 iButton capsule. The DS9107 provides a

watertight enclosure that has been rated to IP68 (refer to Application Note 4126).

iButton DESCRIPTION

APPLICATION

OVERVIEW

The block diagram in Figure 1 shows the relationships between the major control and memory sections of

the DS1921H/Z. The device has seven main data components: 1) 64-bit lasered ROM; 2) 256-bit

scratchpad; 3) 4096-bit general-purpose SRAM; 4) 256-bit register page of timekeeping, control, and

counter registers; 5) 96 bytes of alarm time stamp and duration logging memory; 6) 128 bytes of

histogram memory; and 7) 2048 bytes of data-logging memory. Except for the ROM and the scratchpad,

all other memory is arranged in a single linear address space. All memory reserved for logging purposes,

counter registers and several other registers are read-only for the user. The timekeeping and control

registers are write-protected while the device is programmed for a mission.

The hierarchical structure of the 1-Wire protocol is shown in Figure 2. The bus master must first provide

one of the seven ROM function commands: 1) Read ROM; 2) Match ROM; 3) Search ROM; 4)

Conditional Search ROM; 5) Skip ROM; 6) Overdrive-Skip ROM; or 7) Overdrive-Match ROM. Upon

completion of an Overdrive ROM command byte executed at standard speed, the device will enter

Overdrive mode, where all subsequent communication occurs at a higher speed. The protocol required for

these ROM function commands is described in Figure 13. After a ROM function command is

successfully executed, the memory functions become accessible and the master may provide any one of

2 of 44

DS1921H_11 Related Products

	DS1921H_11	DS1921H
Description	High-Resolution Thermochron iButton	High-Resolution Thermochron iButton

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