Memory Ibuttons

EEPROM iButtons are a rugged read/write data carrier that identifies and stores relevant information about the product or person to which it is attached. This information can be accessed with minimal hardware: for example, a single port pin of a microcontroller. The EEPROM iButtons consists of a factory-lasered registration number that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family Code (14H) plus 256 bits of EEPROM. The power to program and read the EEPROM iButtons is derived entirely from the 1-Wire communication line. Data is transferred serially via the 1-Wire protocol which requires only a single data lead and a ground return. The 48-bit serial number that is factory-lasered into each EEPROM iButtons provides a guaranteed unique identity which allows for absolute traceability. The durable MicroCan package is highly resistant to harsh environments such as dirt, moisture, and shock. Its compact button-shaped profile is self-aligning with cup-shaped receptacles, allowing the EEPROM iButtonsto be used easily by human operators or automatic equipment. Accessories permit the EEPROM iButtons to be mounted on printed circuit boards, plastic key fobs, photo-ID badges, ID bracelets, and many other objects. Applications include work-in-progress tracking, electronic travelers, access control and storage of calibration constants.

Key Features

256-bit Electrically Erasable Programmable Read Only Memory (EEPROM) communicates with the economy of one signal plus ground EEPROM organized as one 256-bit page 64-bit one-time programmable application register is automatically write-protected after programming Reduces control, address, data, power, and programming signals to a single data pin 8-bit family code specifies DS1971 communications requirements to reader Reads and writes over a wide voltage range of 2.8V to 6.0V from -40C to +85C