DS1972 1024-Bit EEPROM iButton®
The DS1972 is a 1024-bit, 1-Wire® EEPROM organized as four memory pages of 256 bits each in a rugged iButton® package. 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 individually be write protected or put in EPROM-emulation mode, where bits can only be changed from a 1 to a 0 state. The DS1972 communicates over the single-conductor 1-Wire® bus.The communication follows the standard Maxim 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.
SPECIAL FEATURES
1024 Bits of EEPROM Memory Partitioned into Four Pages of 256 Bits
Individual Memory Pages can be Permanently Write Protected or Put in EPROM-EmulationMode ("Write to 0")
Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise
IEC 1000-4-2 Level 4 ESD Protection (8kV Contact, 15kV Air, typical)
Reads and Writes Over a Wide Voltage Range of 2.8V to 5.25V from -40°C to +85°C
Communicates to Host with a Single Digital Signal at 15.4kbps or 125kbps Using 1-Wire® Protocol