DS1921G Просмотр технического описания (PDF) - Maxim Integrated
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DS1921G Datasheet PDF : 42 Pages
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Thermochron iButton
ADDRESS
0000h to 01FFh
0200h to 021Fh
0220h to 027Fh
0280h to 07FFh
0800h to 087Fh
0880h to 0FFFh
1000h to 17FFh
1800h to 1FFFh
Figure 5. Memory Map
32-BYTE INTERMEDIATE STORAGE SCRATCHPAD
GENERAL-PURPOSE SRAM (16 PAGES)
32-BYTE REGISTER PAGE
ALARM TIMESTAMPS AND DURATIONS
(RESERVED FOR FUTURE EXTENSIONS)
TEMPERATURE HISTOGRAM MEMORY
(RESERVED FOR FUTURE EXTENSIONS)
DATA-LOG MEMORY (64 PAGES)
(RESERVED FOR FUTURE EXTENSIONS)
PAGES 0 to 15
PAGE 16
PAGES 17 to 19
PAGES 20 to 63
PAGES 64 to 67
PAGES 68 to 127
PAGES128 to 191
PAGES 192 to 255
ADDRESS BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 FUNCTION ACCESS*
0200h
0
10 Seconds
Single Seconds
0201h
0
10 Minutes
Single Minutes
0202h
0203h
0204h
0
12/24 20 Hour 10 Hour
AM/PM
0
0
0
0
0
0
0
10 Date
Single Hours
Day of Week
Single Date
RTC
Registers
R/W R/W**
0205h CENT
0
0
10
Months
Single Months
0206h
10 Years
Single Years
0207h
0208h
0209h
MS
10 Seconds Alarm
MM
10 Minutes Alarm
MH
12/24
20 Hour
AM/PM
Alarm
10 Hour
Alarm
Single Seconds Alarm
Single Minutes Alarm
Single Hours Alarm
RTC Alarm
Registers
R/W R/W**
020Ah
MD
0
0
0
0
Day of Week Alarm
020Bh
020Ch
Temperature Low Alarm Threshold
Temperature High Alarm Threshold
Temperature
Alarms
R/W
R/W**
020Dh
020Eh
Number of Minutes Between Temperature Conversions
EOSC EMCLR
0
EM
RO
TLS
THS
Sample Rate R/W R**
TAS
Control
R/W R/W**
020Fh
(No function, reads 00h)
—
R
R**
*The left entry in the ACCESS column is valid between missions. The right entry shows the applicable access mode while a
mission is in progress.
**While a mission is in progress, these addresses can be read. The first attempt to write to these registers (even read-only
ones), however, ends the mission and overwrites selected writable registers.
Figure 6. Register Pages Map
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