(1) Unit of NEW DS1994L-F5+ 4kb Time Memory iButton DALLAS/MAXIM - Fast Shipping

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Seller: roell_trading ✉️ (214) 100%, Location: South El Monte, California, US, Ships to: US & many other countries, Item: 204120990455 (1) Unit of NEW DS1994L-F5+ 4kb Time Memory iButton DALLAS/MAXIM - Fast Shipping. Genuine Dallas/Maxim Products You are purchasing a single unit (1) of NEW DS1994L-F5+ 4kb Time Memory iButton DALLAS/MAXIM. The condition is BRAND NEW and Ready To Ship.  International shipping available, please reach out with any questions prior to placing your order. These items are discontinued by the manufacturer, all sales are FINAL. Please message me if you have any questions or concerns. Shop with confidence! Shipping to PR/Hawaii currently not available Manufacturer Product Details: The DS1994 Memory i Button 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 i Button 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. OPERATION
The DS1994 has four main data components: 1) 64-bit lasered ROM, 2) 256-bit scratchpad, 3) 4096-bit
SRAM, and 4) timekeeping registers. The timekeeping section utilizes an on-chip oscillator that is
connected to a 32.768kHz crystal. The SRAM and time-keeping registers reside in one contiguous
address space referred to hereafter as memory. All data is read and written least significant bit first.
The memory functions are not available until the ROM function protocol has been established. This
protocol is described in the ROM functions flowchart (Figure 9). The master must first provide one of
four ROM function commands: 1) read ROM, 2) match ROM, 3) search ROM, or 4) skip ROM. After a
ROM function sequence has been successfully executed, the memory functions are accessible and the
master can then provide any one of the four memory function commands (Figure 6).
  • Condition: New
  • Brand: DALLAS/MAXIM
  • Unit Type: Unit
  • Model: DS1994L

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