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iButton 1024-Bit EEPROM

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

Product Details

Key Features

Parametric specs for iButton Products
Technology iButton
End Equipment Asset Management
Memory Type EEPROM
Memory Size 1K bits
Unique Ware No
Real Time Clock No
Budgetary
Price (See Notes)
2.89
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Parameters

Parametric specs for iButton Products
Technology iButton
End Equipment Asset Management
Memory Type EEPROM
Memory Size 1K bits
Unique Ware No
Real Time Clock No
Budgetary
Price (See Notes)
2.89

Key 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-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

Applications/Uses

  • Access Control/Parking Meter
  • Inventory Control
  • Maintenance/Inspection Data Storage
  • Tool Management
  • Work-in-Progress Tracking

Description

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.

Simplified Block Diagram

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Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .