DS1972 Datasheet

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Package Description

• 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

The iButton^® 256-bit EEPROM (DS1972) is a 1024-bit, 1-Wire^® EEPROM chip 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 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.