DS1922E(2008) Просмотр технического описания (PDF) - Maxim Integrated
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DS1922E Datasheet PDF : 44 Pages
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High-Temperature Logger iButton with 8KB
Data-Log Memory
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.
ADDRESS
0000h TO 001Fh
0020h TO 01FFh
32-BYTE INTERMEDIATE STORAGE
SCRATCHPAD
32-BYTE GENERAL-PURPOSE SRAM
(R/W)
GENERAL-PURPOSE SRAM (R/W)
PAGE 0
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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