Datasheet

DS1922L/DS1922T
Temperature Logger iButton with 8KB
Data-Log Memory
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MISSION START
DELAY PROCESS
FROM FIGURE 9b
TO FIGURE 9b
Y
START DELAY
COUNTER = 0?
N
N
SUTA = 1?
Y
N
TEMPERATURE
ALARM?
Y
MIP = 0?
N
N
N
Y
MASTER Tx
FFh DUMMY BYTE
MASTER Tx
64 BITS [PASSWORD]
DS1922 WAITS FOR 1 MINUTE
DS1922 SETS WFTA = 1
DS1922 SETS WFTA = 0
DS1922 DECREMENTS
START DELAY COUNTER
DS1922 WAITS ONE
SAMPLE PERIOD
DS1922 PERFORMS 8-BIT
TEMPERATURE CONVERSION
DS1922 WAITS ONE
SAMPLE PERIOD
MISSION IN
PROGRESS?
N
Y
MASTER Tx RESET?
Y
PASSWORD
ACCEPTED?
N
Y
Y
MEMCLR = 1?
Y
N
DS1922 SETS
MIP = 1,
MEMCLR = 0
DS1922 COPIES RTC DATA TO
MISSION TIMESTAMP REGISTER
DS1922 STARTS LOGGING
TAKING FIRST SAMPLE
DS1922 INITIATES MISSION
START DELAY PROCESS
CCh
START MISSION
[WITH PW]
N
Y
MASTER Tx
FFh DUMMY BYTE
MASTER Tx
64 BITS [PASSWORD]
MISSION IN
PROGRESS?
Y
Y
MASTER Tx RESET?
Y
PASSWORD
ACCEPTED?
DS1922 SETS
MIP = 0,
WFTA = 0
33h
STOP MISSION
[WITH PW]
N
N
N
END OF PROCESS
Figure 9c. Memory/Control Function Flowchart (continued)