DS1922L/DS1922T
iButton Temperature Loggers
with 8KB Data-Log Memory
FROM FIGURE 9a
69h
READ MEMORY [WITH
PW] AND CRC
N
96h
CLEAR MEMORY
[WITH PW]
N
55h
FORCED CONVERSION?
N
TO FIGURE 9c
Y
MASTER Tx
TA1 [T7:T0], TA2 [T15:T8]
MASTER Tx
Y
MASTER Tx
64 BITS [PASSWORD]
MASTER Tx
Y
MASTER Tx
FFh DUMMY BYTE
DECISION MADE
64 BITS [PASSWORD]
FFh DUMMY BYTE
MISSION IN
Y
BY DS1922
PROGRESS?
N
PASSWORD
ACCEPTED?
N
PASSWORD
ACCEPTED?
N
DS1922 PERFORMS A
TEMPERATURE CONVERSION
DECISION MADE
BY MASTER
Y
DS1922 SETS
Y
DS1922 COPIES RESULT TO
MEMORY ADDRESS = [T15:T0]
MISSION IN
Y
ADDRESS 020C/Dh
PROGRESS?
MASTER Rx DATA BYTE FROM
MEMORY ADDRESS
N
DS1922 CLEARS
N
MASTER Tx RESET?
MISSION TIMESTAMP,
DS1922
MISSION SAMPLES COUNTER,
ALARM FLAGS
Y
Y
MASTER Tx RESET?
N
END OF PAGE?
Y
MASTER Rx CRC-16 OF
COMMAND, ADDRESS, DATA
(1ST PASS); CRC-16 OF DATA
(SUBSEQUENT PASSES)
N
INCREMENTS
ADDRESS
COUNTER
N
DS1922 SETS
MEMCLR = 1
MASTER Tx RESET?
Y
MASTER Tx RESET
N
CRC OK?
Y
END OF MEMORY?
N
Y
MASTER Rx "1"s
TO FIGURE 9a
MASTER Tx RESET?
Y
N
FROM FIGURE 9c
Figure 9b. Memory/Control Function Flowchart (continued)
32
Maxim Integrated
相关PDF资料
DS1923-F5# IBUTTON TEMP/HUMIDITY LOGGER F5
DS1961S-F3# IBUTTON EEPROM 1KBit F3
DS1963S-F5+ IBUTTON MONETARY SHA-1
DS1971-F3+ IBUTTON EEPROM 256KBIT F3
DS1972-F3+ IBUTTON EEPROM 1KBit F3
DS1973-F3+ IBUTTON EEPROM 4KBit F3
DS1977-F5# IBUTTON EEPROM 32KBit F5
DS1982-F5+ IBUTTON 1KBit ADD-ONLY F5
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