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Description
4Kb Plus Time Memory iButton?
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DS1994L 1kb/4kb Memory iButton
Manufacturer: DALLAS
1.Description
The DS1992/DS1993 memory iButtons (hereafter referred to as DS199_) are rugged read/write data carriers that act 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 DS199_ 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 DS199_ to be easily used by human operators. Accessories permit the DS199_ to be mounted on almost any surface including plastic key fobs, photo–ID badges, and PC boards.
Applications include access control, work-in-progress tracking, electronic travelers, storage of calibration constants, and debit tokens.
2.Features
1.4096 bits of Read/Write Nonvolatile Memory (DS1993)
2.1024 bits of Read/Write Nonvolatile Memory (DS1992)
3.256-bit Scratchpad Ensures Integrity of Data Transfer
4.Memory Partitioned into 256-bit Pages for Packetizing Data
5.Data Integrity Assured with Strict Read/Write Protocols
6.Operating Temperature Range from -40°C to +70°C
7.Over 10 years of data retention
3.64-bit LASERED ROM
Each DS199_ contain a unique ROM code that is 64 bits long. The first 8 bits are a 1-Wire family code. The next 48 bits are a unique serial number. The last 8 bits are a CRC of the first 56 bits. (See Figure 2.) The 1-Wire CRC is generated using a polynomial generator consisting of a shift register and XOR gates as shown in Figure 3. The polynomial is X8 + X5 + X4 + 1. Additional information about the Dallas 1-Wire Cyclic Redundancy Check is available in the Book of DS19xx iButton Standards. The shift register bits are initialized to zero. Then starting with the least significant bit of the family code, 1 bit at a time is shifted in. After the 8th bit of the family code has been entered, then the serial number is entered. After the 48th bit of the serial number has been entered, the shift register contains the CRC value. Shifting in the 8 bits of CRC should return the shift register to all zeros.
Preview of the first 3 pages of the data sheet
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10000 buyer reviews from United States
Brian Evans
Length of registration:7 years
The DS1994L-F5 integrated circuit from Utsource is a great choice for applications requiring a secure and reliable data storage solution. It features a unique 4-byte ID code that can be used to identify and authenticate the device, as well as a non-volatile memory that can store up to 32 bytes of data. The device also supports a variety of communication protocols, making it an ideal choice for a w
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03/17/2023
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DS1994L-F5
DS1994L-F5 has several brands around the world that may have alternate names for DS1994L-F5 due to regional differences or acquisition. DS1994L-F5 may also be known as the following names:
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