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iButton


What is an iButton?

3 iButtons
---- An iButton is a computer chip which is enclosed in a 16mm thick durable weather resistant stainless steel can. Because of their small size and extreme durability, iButtons can travel virtually anywhere. iButtons are frequently attached to key fobs, rings, watches, or other personal items for applications such as access control to buildings and computers. Additionally, iButtons are commonly mounted to storage crates, trucks, and other equipment for asset management. Furthermore, iButtons are mounted to refrigeration units, outdoor environments, and even to animals for various data logging tasks. iButton varieties include:
  • Address Only - Guaranteed unique 64-bit serial numbers (i.e. address & ROM id) ideal for access control and route verification applications. Models include the DS1990A & DS1990R.
  • Memory - Data can be stored in NVRAM, EPROM (write once read many) and/or EEPROM.  Models range from 1K bits to 64K bits.  
  • Real Time Clock - Supplies a unique way to maintain time in applications e.g. calendar, stopwatch,  hour meter & Time/Date Stamps.
  • Secure - Data can be protected with SHA-1 (Secure Hash Algorithm) or password protection depending on the level of security required.
  • Temperature & Data Loggers - The Thermochrons provide a ideal logger for applications requiring an inexpensive and robust light weight logger.
Address Only iButtons:

DS1990A - The most popular iButton (by volume). It provides a guarenteed unique serial number at a very affordable price.

DS1990R - provides a guarenteed unique serial number. In applications where a presence pulse on contact is critical the DS1990R should be preferred over the DS1990A.


Memory iButtons:

Memory iButton Comparison Table
A brief overview of key Memory iButtons specifications.
Part Number Memory Capacity Memory Type Read/Write Secure Real-Time Clock Can Size
DS1963S 512 Bytes NV RAM Yes Yes, SHA1 No F5
DS1971 32 Bytes EEPROM Yes No No F3/F5
DS1973 512 Bytes EEPROM Yes No No F3/F5
DS1977 32K Bytes EEPROM Yes Yes, Password Protected No F5
DS1982 128 Bytes EPROM Yes, Write Once No No F3/F5
DS1992L 128 Bytes NV RAM Yes No No F5
DS1993L 512 Bytes NV RAM Yes No No F5
DS1994L 512 Bytes NV RAM Yes No Yes F5
DS1996L 8K Bytes NV RAM Yes No No F5
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The Memory iButtons are available with a number of types of Memory:


EEPROM - This memory can be written and rewritten many times. However, they do have a lower write cycle limit (and price tag typically) than NV RAM.

  • DS1971 - 256 Bit EEPROM iButton.
  • DS1973 - 4Kb Bit EEPROM iButton.
  • DS1977 - 32KB Password Protected EEPROM Memory iButton.

EPROM - This memory can be written once and read many times. It is ideal for applications were the data needs to be written permanently. To program EPROM memory, a higher programming voltage (12V) is required than most 1- Wire adapters provide. We suggest using the DS9097U-E25# programming/writing to the EPROM Memory.

  • DS1982 - 1Kb "Add Only" EPROM Memory iButton.

NV RAM - This memory can be rewritten to millions of times. They are ideal for applications requiring the memory to be constantly accessed and modified.

  • DS1963S - The Monetary iButton® provides 4Kb of SHA encypted NV RAM.
  • DS1992L - 1Kb NV RAM Memory iButton.
  • DS1993L - 4Kb NV RAM Memory iButton.
  • DS1994L - 4Kb NV RAM Memory iButton with Clock.
  • DS1996L - 64Kb NV RAM Memory iButton.


Secure Memory iButtons:

  • DS1963S - The Monetary iButton® provides 4Kb of SHA encypted NV RAM.
  • DS1977 - 32KB Password Protected EEPROM Memory iButton.
Temperature Data Logging iButtons:

Thermochron and Hygrochron Temperature Data Logger Comparison Table
A brief outline of the product specifications. Please refer to the data sheet for additional specifications.
Part Number Temperature Range Accuracy Resolution Values/Readings Logging Rate
DS1921G-F5# -40°C to +85°C ± 1°C: -30°C to +70°C 0.5°C 2048 1 to 255 min
DS1921H-F5# 15°C to 46°C ± 1°C 0.125°C 2048 1 to 255 min
DS1922Z-F5# -5°C to 26°C ± 1°C 0.125°C 2048 1 to 255 min
DS1922E-F5# 15°C to 140°C ±1.5°C: +110°C to +140°C 0.0625°C 0.5°C - 8 bit / 0.0625°C - 11 bit 1 sec to 273 hrs
DS1922L-F5# -40°C to +85°C ±0.5°C (-10 to 85°C) 0.0625°C 0.5°C - 8 bit / 0.0625°C - 11 bit 1 sec to 273 hrs
DS1922T-F5# 0°C to 125°C ± 0.5°C: +20°C to +75°C 0.0625°C 0.5°C - 8 bit / 0.0625°C - 11 bit 1 sec to 273 hrs
DS1923-F5# -20°C to +85°C ± 0.5°C: -10°C to +65°C 0.0625°C 0.5°C - 8 bit / 0.0625°C - 11 bit 1 sec to 273 hrs
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DS1921G-F5# - rugged temperature logger with ±1.0°C accuracy. The recording is done at a user-defined rate, as both a direct storage of temperature values and in the form of a histogram. Up to 2048 temperature values are taken and stored at equidistant intervals ranging from 1 to 255 minutes.

DS1921H-F5# - temperature logger with ±1.0°C accuracy and an operating range is 15°C to 46°C. This unit offers higher resolution (0.125°C) than the DS1921G model over a restricted temperature range. It makes the economical choice for applications which remain withing the operating range.

DS1921Z-F5# - temperature logger with ±1.0°C accuracy and an operating range of -5°C to 26°C. It offers a higher resolution (0.125°) than the DS1921G. This makes the DS1921Z preferrable in applications that will remain within th -5°C to 26°C operating range.

DS1922E-F5# - high temperature logger is designed to provide data logging in applications up to 140°C. When housed in the DS9107+ iButton capsule, it is capable of confirming autoclave performance.

DS1922L-F5# - this temperature logger covers the same wide general purpose temperature range of -40°C to 85°C as the DS1921G does, but it provides superior accuracy (±0.5°C), resolution (Up to 0.0625°C), and capacity (up to 8192 readings).

DS1922T-F5# - high temperature logger which monitors temperature from above boiling down to freezing (0°C to 125°C).

DS1923-F5# - this temperature and humidity logger has all the features of the DS1922L with humidity logging and a -20°C to 85°C operating range.


Thermometer iButton:

DS1920-F5+ - this iButton Thermometer covers a wide general purpose temperature range of -55°C to 100°C, but it does not provides any logging capacity. For applications requiring standalone logging, go to our Thermochron Data Loggers.


Real Time Clock iButtons:

iButton Accessories


iButton Accessories are a suite of products which enable the iButtons to read, written to, and deployeed in wide variety of applications. The accessories fall into a number of general categories:

  • Cables - These typically provide a connection between the iButton and the Reader.
  • Mounting Options - Provides an range of options for mounting iButtons which includes snap-in fobs, screw mounting brackets, adhesive pads, & more.
  • Readers - The provide the iButtons data over a variety of interfaces: USB, Ethernet, and RS232.
  • Software - These all have the capability to configure and download Temperature Data Logging iButtons. The 1-Wire Viewer package also has the capability to work with al iButton models.
  • Components - Miscellaneous items used with the iButtons.
iButton Cables:

iButton Cable Comparison Table
A brief overview of key iButton cable specifications.
Part Number Cable Length Starting Connector Terminating Connector Number of iButton Ports Retains iButton
DS1402-BP8+ 8 ft iButton Port iButton 1 Yes
DS1402-RP3+ 3 ft iButton Port RJ11 Plug 1 Yes
DS1402-RP8+ 8 ft iButton Port RJ11 Plug 1 Yes
DS1402-RPL+ 20 ft iButton Port RJ11 Plug 1 Yes
DS1402D-DB8+ 8 ft Dual iButton Port iButton 2 Yes
DS1402D-DR8+ 8 ft Dual iButton Port RJ11 Plug 2 Yes
DS9092GT+ 3.25 ft iButton Probe RJ11 Plug 1 No
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DS1402-BP8 with Connectors (iButton & iButton Probe) Visible
DS1402-BP8+ - This cable is part of the DS1402 series. DS1402-BP8+ enables an iButton socket to be extended 8ft with a Touch-and-Hold (retain) probe.

DS1402-RP3+ with RJ11 Plug & iButton Probe Visible
DS1402-RP3+ - This 3 ft cable provides RJ11 Plug to a Touch-and-Hold probe. It is compatible with the standard RJ11 jack of the iButton Readers.

DS1402-RP8+ with RJ11 Plug & iButton Probe Visible
DS1402-RP8+ - This 8ft cable provides a straightforward connection between the standard iButton Reader RJ11 jack and an iButton. It is the suggested cable when the connection to the iButton is made with a laptop in the field.

DS1402-RPL+ with RJ11 Plug & iButton Probe
DS1402-RPL+ - This 20ft cable provides a straightforward connection between the standard iButton Reader RJ11 jack and an iButton. It is advised in applications where the iButton will be near or over 8ft from the iButton Reader.

DS1402D-DB8+ - This cable provides an iButton socket to be extended 8ft with a Dual Blue-Dot iButton ports. It allows any parallel port 1-Wire adapter to connect with up to two iButtons simultaneously.

DS1402D-DR8+ - This cable provides an iButton socket to be extended 8ft with a Dual Blue-Dot iButton ports. It allows any 1-Wire adapter with the standard RJ11 jack to connect with up to two iButtons simultaneously.

DS9092GT+ - This cable provides an iButton probe for temporary connection which may be extended 3.25 ft. It also has a larger easy to grip handle.


iButton Readers:

iButton Readers Comparison Table
A brief overview of key iButton Reader specifications.
Part Number iButton Models Supported Writes to EPROM iButtons Software Support Stores Data within Reader Protocol / Connector Requires Power Supply
DS9490B# All No 1-Wire Viewer & Thermodata Viewer No USB (Type A) No
DS9490R# All No 1-Wire Viewer & Thermodata Viewer No USB (Type A) No
DS9097U-E25# All Yes 1-Wire Viewer & Thermodata Viewer No RS232 (DB25) Yes, when writing to EPROMs
DS9097U-009# All No 1-Wire Viewer & Thermodata Viewer No RS232 (DB9) No
DS9097U-S09# All No 1-Wire Viewer No RS232 (DB9) No
TC-SERVER-ENET-2 Thermochrons & Hygrochrons No Any Web Browser Yes Ethernet (RJ45) Yes
TDHC400 Thermochrons & Hygrochronsl No TDHC Manager Yes USB (Mini) No
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DS9490B# - The 1-Wire Humidity Sensor provides very accurate Humidity (±3%RH) and Temperature (±0.5°C) readings while also conditional search support, an LED, and optional relay.

DS9490R# - Compatible with the DS1402 RJ12 plug iButton cable readers, this USB to 1-Wire bridge creates an iButton PC reader. It reads all 1-Wire devices and writes to all except EPROM 1-Wire/iButton devices.

DS9097-E25# - This RS232 (DB25) to 1-Wire bridge w/o ID allows for 1-Wire device communication at regular and overdrive speeds. When supplied external power, it is the only commercially available iButton Reader able to write to EPROM memory. Under software control, the adapter can be set up for RS-232 data rates of 19200, 57600 and 115200bps.

DS9097-009# -This RS232 to 1-Wire bridge w/o ID allows for 1-Wire device communication at regular and overdrive speeds. It comes with an unique ID chip on board allowing for software to distinguish between each adapter. Under software control, the adapter can be set up for RS-232 data rates of 19200, 57600 and 115200bps.

DS9097-S09# - This RS232 to 1-Wire bridge with ID allows for 1-Wire device communication at regular and overdrive speeds. Under software control, the adapter can be set up for RS-232 data rates of 19200, 57600 and 115200bps.

Thermochron Server - This Thermochron monitoring system is designed to optimize core functions of the iButton Thermochrons and Hygrochron. It enables the Thermochron and Hygrochrons to be configured and the data analyzed using stand web browsers which allows smartphones, tablets, Windows PC, Macs, and Linux computers to access the data without specialized software. It can also be configured to push data via FTP or HTTP POST.

TDHC400 - This handheld iButton downloader designed to support all Thermochron & Hygrochron iButton models. When touched to a logger it instantly downloads data -- up to 1000 total downloads.

iButton Starters Kits:

iButton Start Kits Comparison Table
A brief overview of key iButton Starter Kits specifications.
Part Number Hardware Included Software Package Recommended # of Loggers Writes User Friendly Labels Data Reporting Capability Mission Start Delay Functionality Data Storage
SK-IB-R DS9490R# & DS1402D-DR8+ 1-Wire Viewer 25 or Less No View reports on screen Must calculate delay in minutes No
SK-TC1-R DS9490R#, DS1402D-DR8+, DS1921G-F5#, & DS9093A+ 1-Wire Viewer 25 or Less No View reports on screen Must calculate delay in minutes No
SK-TCDEL-BD DS9490R#, DS1402D-DR8+, & Choice of Logger Thermodata Viewer Unlimited Yes Print custom reports & graphs Delay selected by desired date & time Can save and reload CSV files
SK-TC-SERVER-2 TC-SERVER-ENET-2, DS1402D-DR8+, Choice of Logger, & Optional Power Supply Web Browser of Choice Unlimited Yes Print reports & graphs Delay selected by desired date & time Stores up to 1000 downloads locally
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SK-IB-R - iButton Connectivity Kit is ideal for familiarizing yourself with the iButtons functionality. The entry level software will allow you to work with all Maxim iButton models using a PC. The kit includes the following parts:
  • DS9490R# USB Adapter
  • DS1402D-DR8+
  • SW-DBV
SK-TC1-R - Thermochron Starter Kit (DS1921K equivalent) It is ideal for those wanting to familiarize themselves with Thermochron iButtons. It includes:
  • DS9490R# USB Adapter
  • DS1402D-DR8+
  • SW-DBV
  • DS1921G-F5#
  • DS9093A+
SK-TCDEL-BD - The Deluxe Thermochron Starter Kit features the Thermodata Viewer software's ser interface provides along with the necessary hardware for configuring and download Thermochron data through a Windows PC. It include the following items:
  • DS9490R# USB Adapter
  • DS1402D-DR8+
  • Thermodata Viewer Software CD
  • Your choice of Thermochron/Hygrochron
SK-TC-SERVER-2 - The 1-Wire Temperature, Humidity, Light & Pressure sensor provides a means to monitor many environmental factors in one form factor. Additional features include conditional search support, LED, and optional relay. The LED and relay may be controlled independently or in response to user selected alarm thresholds for greater flexibility.
iButton Mounting Options:

iButton Mounting Options Comparison Table
A brief outline of the product specifications. Please refer to the data sheet for additional specifications.
Part Number Mounting Surface iButton Removable Compatible With Multiple Colors Available Waterproof
DS1404+ Wall - DS1402 Cables No No
DS9093A Key Ring No F5 iButtons Yes No
DS9093F+ Key Ring Yes Any iButton No No
DS9093N+ Key Ring Yes F5 iButtons No No
DS9093RA+ Plastic Card Yes F5 iButtons No No
DS9093RB+ Plastic Card Yes F5 iButtons with DS9093RA+ No No
DS9093S+ Wall Yes F5 iButtons No No
DS9094F+ PCB Through Hole Yes F5 iButtons No No
DS9096P+ Flat Smooth Surface No Any iButton No No
DS9098P+ PCB Surface Mount Yes F5 iButtons No No
DS9107+ Clamps to Cable Yes F5 iButtons No Yes
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DS1404+ - This provides a dedicated location to hang the iButton Probe of the DS1402-RP3+, DS1402-RP8+, and DS1402-RPL when they are not in use. The DS1404 comes with double-sided adhesive tape which makes the installation simple. Merely, prepare a clean and dry surface then peal and stick.

DS9093A+ - This angled iButton key ring mount, available in multiple colors, supports F5 microcan iButtons. The fob securely holds the iButton which cannot be removed without damaging the fob.

DS9093F+ - allows for easy snap-in and removal of the iButtons. This key ring mount supports both the F5 & F3 microcan iButtons.

DS9093N+ - this angled fob provides a temporary hold to the iButtons which may be made permanent with the use of the DS9093RA+ (below). It also leaves the back of the iButton exposed while connected to the DS9093N+ allowing the iButton to read when inserted into a DS9094F+.

DS9093RA - This stainless steel lock ring allows for the mounting of an iButton onto a DS9093N+ permanently or onto items with a pre-punched hole. It is commonly used as a plastic card mount in conjunction with the DS9093RB+.

DS9093RB+ - This stainless steel washer when used in conjuction with the DS9093RA+ provides additional retention of the F5 microcan iButtons.

DS9093S+ - iButton mount's 2-hole design is perfect for permanently mounting iButtons onto walls and other flat objects using screws or rivets.

DS9096P+ - This small, low cost, double-sided adhesive pad offers excellent retention for use in exterior and interior based applications. It is cut to the exact diameter of the iButtons.

DS9098P+ - This iButton retainer is designed to secure an iButton F5 microcan onto a PCB board. It's three metal piece design allows for proper connection for two ground and a data connection.

DS9107+ - This iButton Capsule is designed to provide waterproof (IP68) protection to a Thermochron secured within it.


iButton Software:

iButton Software Comparison Table
A brief overview of key iButton software specifications.
Software Package Recommended # of Loggers Writes User Friendly Labels Data Reporting Capability Mission Start Delay Functionality Export Data Options Data Storage
1-Wire Viewer 25 or Less No View reports on screen Must calculate delay in minutes Yes, via *.csv format No
Thermodata Viewer Unlimited Yes Print custom reports & graphs Delay selected by desired date & time Yes, via *.csv format Can save and reload CSV files
Thermochron Server Unlimited Yes Print reports & graphs Delay selected by desired date & time Yes, via *.xml or *.csv format Stores up to 1000 downloads locally
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1-Wire Viewer - Designed to support all iButton models. It takes a more generic approach to memory & iButton management compared to software options dedicated to the Thermochron iButtons. It serves as the entry level software which is great for managing small numbers of Thermochrons.

Thermodata Viewer - 1-Wire Light Sensor which Provides an intuitive user interface (UI) which simplifies the management of larger quantities of Thermochron loggers. This is accomplished through simplifying the download & exporting process.

Thermochron Server - This Thermochron monitoring system is designed to optimize core functions of the iButton Thermochrons and Hygrochron. It enables the Thermochron and Hygrochrons to be configured and the data analyzed using stand web browsers which allows smartphones, tablets, Windows PC, Macs, and Linux computers to access the data without specialized software. It can also be configured to push data via FTP or HTTP POST.


Other iButton Accessories:

DS1404+ - This provides a dedicated location to hang the iButton Probe of the DS1402-RP3+, DS1402-RP8+, and DS1402-RPL when they are not in use. The DS1404 comes with double-sided adhesive tape which makes the installation simple. Merely, prepare a clean and dry surface then peal and stick.

DS9092+ - creates the necessary electrical contact with an iButton required for reading and writing to the iButtons. It features no moving parts for improve durability and is easily installed using a push nut.

DS9092L+ - Makes the necessary electrical contacts to the iButton. It features LED for visual confirmation and it is held in location using a threaded nut.

DS9092R+ - The iButtons port will make the electrical connection to DS1402 iButton Reader Cables. It can be used in applications where the actual iButton or 1-Wire device is not accessible to the reader cable.

DS9092T# - Provides a reliable electrical connection for reading/writing to iBut. It is ideal in applications where the iButtons will only be temporarily connected to the reader.

OR-DS9107+ - This is a replacement O-Ring for a worn or damaged O-Ring in the DS9107+.

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