Maxim's iButton^® devices are small, durably packaged modules with globally unique digital addresses. Enhanced by Maxim's 1-Wire communications protocol, they provide the ability to deliver or record data where other products cannot, such as in very harsh environments. An iButton device is ideal for any application where information needs to follow a person or object, such as temperature and humidity data logging, access control, asset tracking, and electronic cash (eCash) transactions. Learn more about iButton Devices

iButton Products By Application

Data Loggers
Asset Management
eCash

Electronic Access Control
Guard Tour

iButton Design Resources

Software Resources
iButton Accessories
Authorized Solution Developers

What Is an iButton?
iButton FAQs
iButton Certifications

Also see:
NFC/RFID Products

Featured

DS1922E
Low-cost data logger measures and logs temperatures up to 140°C

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DS1972
iButton^® 1024-bit EEPROM with EPROM-emulation mode for protection against accidental erasure or tampering of data

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DS1990R
iButton^® device includes unique 64-bit serial number for automatic identification

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Resources

Product Tree

New Products

DS1964S
DeepCover Secure Authenticator iButton with SHA-256

Symmetric-Key-Based Bidirectional Secure Authentication Model Based on SHA-256
Strong Authentication with a High-Bit-Count User-Programmable Secret and Input Challenge
512 Bits of User EEPROM Partitioned Into Two Pages of 256 Bits

Reference Designs

Type	ID	Title
Reference Circuit	4477	Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
Reference Circuit	4206	Choosing the Right 1-Wire® Master for Embedded Applications
Reference Circuit	244	Advanced 1-Wire Network Driver

Reference Designs