DS1921H-F5-A1C datasheet, PDF - EEWORLD Datasheet

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DS1921H-F5-A1C: DescriptioniButtons; Categorystorage; File Size421KB，45 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1921H/DS1921Z

High-Resolution Thermochron

iButton Devices

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 consecutive temperature measurements

in 2KB of datalog 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 battery-backed

SRAM

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



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 Can

COMMON iButton DEVICE

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

#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 Device Probe



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

1 of 45

19-4887; Rev 11/13

DS1921H/Z

iButton DEVICE DESCRIPTION

The DS1921H/Z Thermochron® iButton devices 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 general-purpose battery-backed SRAM 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.

APPLICATION

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

general-purpose battery-backed SRAM 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).

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 datalog 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

the seven available commands. The protocol for these memory function commands is described in Figure

10.

All data is read and written least significant bit first.

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DS1921H/Z

DS1921H/Z BLOCK DIAGRAM

Figure 1

1-Wire

Port

ROM

Function

Control

64-Bit

Lasered

ROM

Parasite

Powered

Circuitry

Memory

Function

Control

256-Bit

Scratchpad

General-Purpose

SRAM

Internal

Timekeeping &

Control Reg. &

Counters

32.768kHz

Oscillator

Alarm Time Stamp

and Duration

Logging Memory

Temperature

Sensor

Control

Logic

Histogram Memory

3V Lithium

Datalog

Memory

PARASITE POWER

The block diagram (Figure 1) shows the parasite-powered circuitry. This circuitry “steals” power

whenever the IO input is high. IO will provide sufficient power as long as the specified timing and

voltage requirements are met. The advantages of parasite power are two-fold: 1) By parasiting off this

input, battery power is not consumed for 1-Wire ROM function commands, and 2) if the battery is

exhausted for any reason, the ROM may still be read normally. The remaining circuitry of the DS1921 is

solely operated by battery energy. As a consequence, if the battery is exhausted, all memory data is lost

including the data of the last mission, and no new mission can be started. Application Note 5057:

OneWireViewer Tips and Tricks

explains how to check the battery status.

64-BIT LASERED ROM

Each DS1921 contains a unique ROM code that is 64 bits long. The first eight bits are a 1-Wire family

code. The next 36 bits are a unique serial number. The next 12 bits, called temperature range code, allow

distinguishing the DS1921H and DS1921Z from each other and from other DS1921 versions. The last

eight bits are a CRC of the first 56 bits. See Figure 3 for details. The 1-Wire CRC is generated using a

polynomial generator consisting of a shift register and XOR gates as shown in Figure 4. The polynomial

is X

+ X

+ 1. Additional information about the Maxim 1-Wire Cyclic Redundancy Check is

available in Application Note 27.

The shift register bits are initialized to 0. Then starting with the least significant bit of the family code,

one bit at a time is shifted in. After the eighth bit of the family code has been entered, then the serial

number followed by the temperature range code is entered. After the range code has been entered, the

shift register contains the CRC value. Shifting in the eight bits of CRC returns the shift register to all 0s.

3 of 45

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