The product is a 1024-bit, 1-Wire® EEPROM chip packaged in a rugged iButton® package, organized as four 256-bit memory pages. Data is written to an 8-byte scratchpad, verified, and then copied to the EEPROM memory. As a special feature, the four memory pages can be individually written to protect or put in EPROM emulation mode, where bits can only be changed from 1 to 0. The DS1972 communicates over the single-conductor 1-Wire bus. The communication follows the standard 1-Wire protocol. Each device has its own unalterable and unique 64-bit ROM registration number that is factory lasered into the device. The registration number is used to address the device in a multidrop, 1-Wire net environment. The product has applications in access control/parking meter, work-in-progress tracking, tool management, inventory control, maintenance/inspection, and data storage. The product has features such as 1024 bits of EEPROM memory partitioned into four pages of 256 bits, individually memory pages can be permanently write protected or put in EPROM emulation mode (write to 0), switchpoint hysteresis and filtering to optimize performance in the presence of noise, IEC 1000-4-2 level 4 ESD protection ( ±8 kV contact, ±15 kV air).
The DS1972 is a 1024‑bit EEPROM iButton that communicates over a single‑wire 1‑Wire bus. It provides four 256‑bit memory pages, each of which can be write‑protected or placed in EPROM‑emulation mode. The device includes a unique 64‑bit factory‑lasered ROM registration number for absolute traceability and supports a wide voltage range from 2.8 V to 5.25 V.
The datasheet details electrical characteristics, absolute maximum ratings, memory map, command set, and timing specifications. It also lists typical applications such as access control, parking meters, tool management, inventory control, and maintenance data storage.
| Memory Capacity | 1024 bits (four 256‑bit pages) |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Write/Erase Endurance | 200 k cycles (at +25 °C) |
| ESD Protection | IEC 1000‑4‑2 Level 4 (±8 kV contact, ±15 kV air) |
The DS1972 provides 1024 bits of EEPROM memory organized into four 256‑bit pages.
The device is rated for 200 k write/erase cycles at 25 °C.