DS1922E datasheet(9/44 Pages) MAXIM

Part #	DS1922E

Description	High-Temperature Logger iButton with 8KB Data-Log Memory

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Manufacturer	MAXIM [Maxim Integrated Products]

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High-Temperature Logger iButton with 8KB

Data-Log Memory

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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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DS1922E Datasheet(PDF) 9 Page - Maxim Integrated Products

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