Key Features
• 4096 bits of read/write nonvolatile memory. • 256-bit scratchpad ensures integrity of data transfer. • Memory partitioned into 256-bit pages for packetizing data. • Data integrity assured with strict read/write protocols. • Contains real-time clock/calendar in binary format. • Interval timer can automatically accumulate time when power is applied. • Programmable cycle counter can accumulate the number of system power-on/off cycles. • Programmable alarms can be set to generate interrupts for interval timer, real-time clock, and/or cycle counter write-protect feature provides tamperproof time data. • Programmable expiration date that limits access to SRAM and timekeeping. • Clock accuracy is better than ±2 minutes/month at 25°C. • Operating temperature range from -40°C to +70°C. • Over 10 years of data retention. Common iButton Features
• Digital Identification and Information by Momentary Contact. • Unique, Factory-Lasered and Tested 64-Bit Registration Number (8-Bit Family Code + 48-Bit Serial Number + 8-Bit CRC Tester) - Assures Absolute Traceability Because no Two Parts are alike. • Multidrop Controller for 1-Wire Net. • Chip-Based Data Carrier Compactly Stores Information. • Data Can be Accessed While Affixed to Object. • Button Shape is Self-Aligning with Cup-Shaped Probes. • Durable Stainless Steel Case Engraved with Registration Number Withstands Harsh Environments. • Easily Affixed with Self-Stick Adhesive Backing, Latched by its Flange, or Locked with a Ring Pressed Onto its Rim. • Presence Detector Acknowledges When Reader First Applies Voltage. • Meets UL#913 (4th Edit.). Intrinsically Safe Apparatus: Approved Under Entity Concept for Use in Class I, Division 1, Group A, B, C and D Locations (application pending).
DS1994 Memory iButton is a rugged read/write data carrier that acts as a localized database, easily accessible with minimal hardware. The nonvolatile memory and optional timekeeping capability offer a simple solution to storing and retrieving vital information pertaining to the object to which the iButton is attached. Data is transferred serially through the 1-Wire protocol that requires only a single data lead and a ground return. The scratchpad is an additional page that acts as a buffer when writing to memory. Data is first written to the scratchpad where it can be read back. After the data has been verified, a copy scratchpad command transfers the data to memory. This process ensures data integrity when modifying the memory. A 48-bit serial number is factory lasered into ea…
| Key Features
• 4096 bits of read/write nonvolatile memory.
• 256-bit scratchpad ensures integrity of data transfer.
• Memory partitioned into 256-bit pages for packetizing data.
• Data integrity assured with strict read/write protocols.
• Contains real-time clock/calendar in binary format.
• Interval timer can automatically accumulate time when power is applied.
• Programmable cycle counter can accumulate the number of system power-on/off cycles.
• Programmable alarms can be set to generate interrupts for interval timer, real-time clock, and/or cycle counter write-protect feature provides tamperproof time data.
• Programmable expiration date that limits access to SRAM and timekeeping.
• Clock accuracy is better than ±2 minutes/month at 25°C.
• Operating temperature range from -40°C to +70°C.
• Over 10 years of data retention. | Common iButton Features
• Digital Identification and Information by Momentary Contact.
• Unique, Factory-Lasered and Tested 64-Bit Registration Number (8-Bit Family Code + 48-Bit Serial Number + 8-Bit CRC Tester) - Assures Absolute Traceability Because no Two Parts are alike.
• Multidrop Controller for 1-Wire Net.
• Chip-Based Data Carrier Compactly Stores Information.
• Data Can be Accessed While Affixed to Object.
• Button Shape is Self-Aligning with Cup-Shaped Probes.
• Durable Stainless Steel Case Engraved with Registration Number Withstands Harsh Environments.
• Easily Affixed with Self-Stick Adhesive Backing, Latched by its Flange, or Locked with a Ring Pressed Onto its Rim.
• Presence Detector Acknowledges When Reader First Applies Voltage.
• Meets UL#913 (4th Edit.). Intrinsically Safe Apparatus: Approved Under Entity Concept for Use in Class I, Division 1, Group A, B, C and D Locations (application pending). |
DS1994 Memory iButton is a rugged read/write data carrier that acts as a localized database, easily accessible with minimal hardware. The nonvolatile memory and optional timekeeping capability offer a simple solution to storing and retrieving vital information pertaining to the object to which the iButton is attached. Data is transferred serially through the 1-Wire protocol that requires only a single data lead and a ground return.
The scratchpad is an additional page that acts as a buffer when writing to memory. Data is first written to the scratchpad where it can be read back. After the data has been verified, a copy scratchpad command transfers the data to memory. This process ensures data integrity when modifying the memory. A 48-bit serial number is factory lasered into ea…
