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DS1922L/DS1922T
iButton Temperature Loggers
with 8KB Data-Log Memory
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
FUNCTION
ACCESS*
0200h
0201h
0
0
10 Seconds
10 Minutes
Single Seconds
Single Minutes
0202h
0203h
0204h
0
0
CENT
12/24
0
0
20 Hour
10 Hour
AM/PM
10 Date
10
0
Months
Single Hours
Single Date
Single Months
Real-
Time Clock
Registers
R/W
R
0205h
10 Years
Single Years
0206h
0207h
0
0
Low Byte
High Byte
Sample
Rate
R/W
R
0208h
0209h
020Ah
020Bh
Low Threshold
High Threshold
(No Function with the DS1922L/DS1922T)
(No Function with the DS1922L/DS1922T)
Temperature
Alarms
—
R/W
R/W
R
R
020Ch
020Dh
Low Byte
0 0
High Byte
0
0
0
Latest
Temperature
R
R
020Eh
020Fh
(No Function with the DS1922L/DS1922T)
(No Function with the DS1922L/DS1922T)
—
R
R
Temperature
0210h
0
0
0
0
0
0
ETHA
ETLA
Alarm
R/W
R
Enable
0211h
0212h
0213h
0214h
0215h
1
0
1
BOR
1
1
0
1
1
1
1
0
SUTA
1
0
1
0
RO
1
WFTA
1
0
(X)
0
MEMCLR
1
0
TLFS
0
0
0
EHSS
0
THF
MIP
0
EOSC
ETL
TLF
0
—
RTC Control
Mission
Control
Alarm Status
General
Status
R/W
R/W
R/W
R
R
R
R
R
R
R
0216h
Low Byte
Start
0217h
0218h
Center Byte
High Byte
Delay
Counter
R/W
R
*The left entry in the ACCESS column is valid between missions. The right entry shows the applicable access type while a
mission is in progress.
Figure 6. Register Pages Map
Maxim Integrated
17
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