DS1973

2 of 2

EXAMPLES OF ACCESSORIES

DS9096P

Self–Stick Adhesive Pad

DS9101

Multi–Purpose Clip

DS9093RA

Mounting Lock Ring

DS9093A

Snap–In Fob

DS9092

iButton Probe

iButton DESCRIPTION

The DS1973 4-kbit EEPROM iButton is 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 micro-controller. The DS1973 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 (23H) plus 4096 bits of EEPROM. The power to program and read the DS1973 is derived

entirely from the 1–Wire communication line. The memory is organized as sixteen pages of 256 bits

each. The 64–bit registration number provides a guaranteed unique identity which allows for absolute

traceability. Data is transferred serially via the 1–Wire protocol which requires only a single data lead and

a ground return. 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 DS1973 to be used easily by human operators or automatic equipment. Accessories permit

the DS1973 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.

OVERVIEW

The block diagram in Figure 1 shows the relationships between the major control and memory sections of

the DS1973. The DS1973 has three main data components: 1) 64–bit lasered ROM, 2) 256–bit

scratchpad, and 3) 4096–bit EEPROM. The bus master must first provide one of the ROM function

commands before the memory functions become accessible. All data is read and written least significant

bit first.

The DS1973 contains the same memory chip as the DS2433-Z01 (with 10000 write/erase cycles). For a

full description of the logical behavior, please refer to the DS2433-Z01 data sheet.

DS1973 BLOCK DIAGRAM Figure 1