DS1923
iButton Hygrochron Temperature/Humidity
Logger with 8KB Data-Log Memory
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 super-
vision 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
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
Low Threshold
High Threshold
Temperature
Alarms
Humidity
Alarms
R/W
R/W
R
R
020Ch
020Dh
Low Byte
0 0
High Byte
0
0
0
Latest
Temperature
R
R
020Eh
020Fh
Low Byte
High Byte
Latest
Humidity
R
R
Temperature
0210h
0
0
0
0
0
0
ETHA
ETLA
Alarm
R/W
R
Enable
Humidity
0211h
1
1
1
1
1
1
EHHA
EHLA
Alarm
R/W
R
Enable
0212h
0213h
0214h
0215h
0
1
BOR
1
0
1
1
1
0
SUTA
1
0
0
RO
1
WFTA
0
HLFS
HHF
MEMCLR
0
TLFS
HLF
0
EHSS
EHL
THF
MIP
EOSC
ETL
TLF
0
RTC Control
Mission
Control
Alarm Status
General
Status
R/W
R/W
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
15
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