DS1923-F5 Maxim Integrated Products, DS1923-F5 Datasheet - Page 14

• Manufacturer Part Number: DS1923-F5
• Description: Board Mount Temperature Sensors
• Manufacturer: Maxim Integrated Products

Specifications of DS1923-F5

• Full Temp Accuracy: +/- 0.5 C
• Package / Case: F5 MicroCan
• Digital Output - Bus Interface: Serial (1-Wire)
• Digital Output - Number Of Bits: 12 bit
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 20 C
• Output Type: Digital
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Hygrochron Temperature/Humidity Logger
iButton with 8KB Data-Log Memory
Figure 5 shows the DS1923 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
storage space for calibration data. The data-log log-
ging 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 pages. The calibra-
tion memory holds data from the device calibration that
can be used to further improve the accuracy of temper-
ature and humidity readings. See the Software
Correction Algorithm sections for details. The last byte
Figure 5. Memory Map
14
______________________________________________________________________________________
0000h TO 001Fh
0020h TO 01FFh
0200h TO 021Fh
0220h TO 023Fh
0240h TO 025Fh
0260h TO 027Fh
0280h TO 0FFFh
1000h TO 2FFFh
ADDRESS
CALIBRATION MEMORY PAGE 1 (R/W)
CALIBRATION MEMORY PAGE 2 (R/W)
(RESERVED FOR FUTURE EXTENSIONS)
32-BYTE GENERAL-PURPOSE SRAM
32-BYTE INTERMEDIATE STORAGE
DATA-LOG MEMORY (READ ONLY)
GENERAL-PURPOSE SRAM (R/W)
Memory
32-BYTE REGISTER PAGE 1
32-BYTE REGISTER PAGE 2
SCRATCHPAD
(R/W)
of the calibration memory page stores an 8-bit CRC of
the preceding 31 bytes. Page 19 is an exact copy of
the data in page 18. While the user can overwrite the
calibration memory, this is not recommended. See the
Security by Password section for ways to protect the
memory. The access type for the register pages is reg-
ister-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 writ-
ten solely under supervision of the on-chip control
logic. Due to the special behavior of the write access
logic (write scratchpad, copy scratchpad), it is recom-
mended 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.
PAGES 128 TO 383
PAGES 20 TO 127
PAGES 1 TO 15
PAGE 16
PAGE 17
PAGE 18
PAGE 19
PAGE 0