Single-wire serial EEPROM enables remote identification

November 08, 2017 //By Julien Happich
Microchip's AT21CS11 is a single-wire, two-pin Electrically Erasable Programmable Read-Only Memory (EEPROM) device with a 2.7 to 4.5V operational voltage range.

Designed for identifying and authenticating remote items, such as cartridges or cables, where space for electronic components is limited, the chip has 1 Kbit of EEPROM memory (four sectors of 256 bits each), a 64-bit serial number and 128 bits for extra user-programmable tracking memory. The extra memory allows designers to add unique identification and operating parameters, such as consumption and usage information, in locations that can be remote from the main electronics.

Any, or all, of the memory sections can be permanently locked by the end-equipment manufacturer to allow tracking of products and the identification of attachments to assist with counterfeit prevention. The EEPROM will help customers to warranty their product or prevent counterfeits and ensure proper continued operation of their goods through authorised replacements. The chip connects to a system through a Single Input/Output (SI/O) wire that serves as both the communication and the power supply to the part. Needing only one wire and a ground allows makers of Fibre to the Home (FTTH) cable-ends to add critical cable characteristic parameters to different cable types. The SI/O wire also enables a simple two-point mechanical snap-in or twist-on connector for disposable devices where larger three-, five- or eight-wire solutions become impractical. 

Microchip -  www.microchip.com