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DS1972-F5 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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DS1972-F5 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 23 page 1024-Bit EEPROM iButton _______________________________________________________________________________________ 5 Detailed Description The DS1972 combines 1024 bits of EEPROM, an 8-byte register/control page with up to 7 user read/write bytes, and a fully featured 1-Wire interface in a rugged iButton package. Each DS1972 has its own 64-bit ROM registration number that is factory lasered into the chip to provide a guaranteed unique identity for absolute traceability. Data is transferred serially through the 1- Wire protocol, which requires only a single data contact and a ground return. The DS1972 has an additional memory area called the scratchpad that acts as a buffer when writing to the main memory or the register page. Data is first written to the scratchpad from which it can be read back. After the data has been verified, a Copy Scratchpad command transfers the data to its final memory location. Applications of the DS1972 include access control/parking meter, work-in-progress tracking, tool management, inventory control, and maintenance/inspection data storage. Free software for communication with the DS1972 is available at www.maxim-ic.com/ibutton. Overview The block diagram in Figure 1 shows the relationships between the major control and memory sections of the DS1972. The DS1972 has four main data components: 64-bit lasered ROM, 64-bit scratchpad, four 32-byte pages of EEPROM, and a 64-bit register page. The hierarchical structure of the 1-Wire protocol is shown in Figure 2. The bus master must first provide one of the seven ROM function commands: Read ROM, Match ROM, Search ROM, Skip ROM, Resume, Overdrive-Skip ROM, or Overdrive-Match ROM. Upon completion of an Overdrive-Skip ROM or Overdrive- Match ROM command byte executed at standard speed, the device enters overdrive mode where all subsequent communication occurs at a higher speed. The protocol required for these ROM function MEMORY FUNCTION CONTROL UNIT DATA MEMORY 4 PAGES OF 256 BITS EACH CRC-16 GENERATOR 64-BIT SCRATCHPAD 1-Wire FUNCTION CONTROL 64-BIT LASERED ROM PARASITE POWER IO REGISTER PAGE 64 BITS DS1972 Figure 1. Block Diagram DS1972 COMMAND LEVEL: AVAILABLE COMMANDS: DATA FIELD AFFECTED: READ ROM MATCH ROM SEARCH ROM SKIP ROM RESUME OVERDRIVE-SKIP ROM OVERDRIVE-MATCH ROM 64-BIT REG. #, RC-FLAG 64-BIT REG. #, RC-FLAG 64-BIT REG. #, RC-FLAG RC-FLAG RC-FLAG RC-FLAG, OD-FLAG 64-BIT REG. #, RC-FLAG, OD-FLAG 1-Wire ROM FUNCTION COMMANDS (SEE FIGURE 9) WRITE SCRATCHPAD READ SCRATCHPAD COPY SCRATCHPAD READ MEMORY 64-BIT SCRATCHPAD, FLAGS 64-BIT SCRATCHPAD DATA MEMORY, REGISTER PAGE DATA MEMORY, REGISTER PAGE DS1972-SPECIFIC MEMORY FUNCTION COMMANDS (SEE FIGURE 7) Figure 2. Hierarchical Structure for 1-Wire Protocol |
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Similar Description - DS1972-F5 |
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