DS1972 1024-Bit EEPROM iButton

EPROM-Emulation Mode for Protection Against Accidental Erasure or Tampering of Data

Status
Part Number	Status
DS1972	Active: In production, but some versions are no longer available. See Ordering Information.

Description

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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 Dallas Semiconductor 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.

Key Features		Applications/Uses
1024 Bits of EEPROM Memory Partitioned into Four Pages of 256 Bits Individual 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 (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		Access Control/Parking Meter Inventory Control Maintenance/Inspection Data Storage Tool Management Work-in-Progress Tracking