DS1994L-F5 / DS1994L-F5+ - 4KB PLUS TIME MEMORY IBUTTON BY DALLAS SEMICONDUCTOR 

DS1994L-F5 / DS1994L-F5+ - 4kb Plus Time Memory iButton by Dallas Semiconductor

Product Code: DS1994L-F5 Price: Check Latest 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 each DS1994 to provide a guaranteed unique identity that allows for absolute traceability. The durable MicroCan package is highly resistant to environmental hazards such as dirt, moisture, and shock. Its compact, coin-shaped profile is self-aligning with mating receptacles, allowing the DS1994 to be easily used by human operators. Accessories permit the DS1994 to be mounted on almost any surface including plastic key fobs, photo-ID badges, and PC boards. The DS1994 also includes time-keeping functions, a real-time clock/calendar, interval timer, cycle counter, and programmable interrupts, in addition to the nonvolatile memory. The internal clock can be programmed to deny memory access based on absolute time/date, total elapsed time, or the number of accesses. These features allow the DS1994 to be used to create a stopwatch, alarm clock, time and date stamp, logbook, hour meter, calendar, system power cycle timer, interval timer, and event scheduler. 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. Key Specifications: iButton Products Part Number Memory Type Memory Size Other Package DS1994 NV RAM 4K bits Alarms Interval Timer Power-Cycle Counter Real-Time Clock F5 Common iButton Features 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 MicroLAN. Digital identification by momentary contact. Chip-based data carrier compactly stores information. Data can be accessed while affixed to an object. Economically communicates to bus master with a single digital signal at 16.3k bits per second. Standard 16 mm diameter and 1-Wire protocol ensure compatibility with iButton family. Button shape is self-aligning with cupshaped 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 1, Division 1, Group A, B, C and D locations. iButton and 1-Wire are registered trademarks of Dallas Semiconductor Corporation.