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DS1922E-F5 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS1922E-F5 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 44 page High-Temperature Logger iButton with 8KB Data-Log Memory _______________________________________________________________________________________ 9 Memory Figure 5 shows the DS1922E memory map. Pages 0 to 15 contain 512 bytes of general-purpose SRAM. The various registers to set up and control the device fill pages 16 and 17, called register pages 1 and 2 (see Figure 6 for details). Pages 18 and 19 can be used as extension of the general-purpose memory. The data-log logging memory starts at address 1000h (page 128) and extends over 256 pages. The memory pages 20 to 127 are reserved for future extensions. The scratchpad is an additional page that acts as a buffer when writing to the SRAM memory or the register page. The data memory can be written at any time. The access type for the register pages is register-specific and depends on whether the device is programmed for a mission. Figure 6 shows the details. The data-log memory is read only for the user. It is written solely under supervi- sion of the on-chip control logic. Due to the special behavior of the write access logic (write scratchpad, copy scratchpad), it is recommended to only write full pages at a time. This also applies to the register pages. See the Address Registers and Transfer Status section for details. 32-BYTE INTERMEDIATE STORAGE SCRATCHPAD ADDRESS 0000h TO 001Fh 32-BYTE GENERAL-PURPOSE SRAM (R/W) PAGE 0 0020h TO 01FFh GENERAL-PURPOSE SRAM (R/W) PAGES 1 TO 15 0200h TO 021Fh 32-BYTE REGISTER PAGE 1 PAGE 16 0220h TO 023Fh 32-BYTE REGISTER PAGE 2 PAGE 17 0240h TO 025Fh GENERAL-PURPOSE SRAM (R/W) PAGE 18 0260h TO 027Fh GENERAL-PURPOSE SRAM (R/W) PAGE 19 0280h TO 0FFFh (RESERVED FOR FUTURE EXTENSIONS) PAGES 20 TO 127 1000h TO 2FFFh DATA-LOG MEMORY (READ ONLY) PAGES 128 TO 383 Figure 5. Memory Map |
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