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DS1921G
Thermochron iButton Device
Step 3: Set the search condition and Mission Start Delay and clear the alarm flags
In this example, the rollover is disabled and the search condition is set for a high temperature only. The mission is
to start with a delay of 90min (005Ah) and the alarm flags TLF, THF, and TAF are cleared. This results in the follow-
ing data to be written to the special function registers:
ADDRESS
DATA
20Eh
02h
20Fh
00h*
210h
00h*
211h
00h*
212h
5Ah
213h
00h
214h
00h
*Writing through address locations 20Fh to 211h is faster than accessing the Mission Start Delay register in a separate cycle. The
write attempt has no effect on the contents of these registers.
With only a single DS1921G connected to the bus master, the communication of step 3 is as follows:
MASTER MODE
Tx
Rx
Tx
Tx
Tx
Tx
Tx
Tx
Rx
Tx
Tx
Rx
Rx
Rx
Rx
Tx
Rx
Tx
Tx
Tx
DATA (LSB FIRST)
(Reset)
(Presence)
CCh
0Fh
0Eh
02h
<7 data bytes>
(Reset)
(Presence)
CCh
AAh
0Eh
02h
14h
<7 data bytes>
(Reset)
(Presence)
CCh
55h
0Eh
COMMENTS
Reset Pulse (480 μs to 960 μs)
Presence pulse
Issue Skip ROM command
Issue Write Scratchpad command
TA1, beginning offset = 0Eh
TA2, address = 020Eh
Write 7 bytes of data to scratchpad
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Read Scratchpad command
Read TA1, beginning offset = 0Eh
Read TA2, address = 020Eh
Read E/S, ending offset = 14h, flags = 0h
Read scratchpad data and verify
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Copy Scratchpad command
TA1
Tx
02h
TA2
(AUTHORIZATION CODE)
Tx
Tx
Rx
Maxim Integrated
13h
(Reset)
(Presence)
E/S
Reset pulse
Presence pulse
39
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相关PDF资料
DS1921H-F5# IBUTTON THERMOCHRON F5
DS1921K# KIT IBUTTON THERMOCHRON
DS1922E-F5# IBUTTON TEMP LOGGER 4KBit F5
DS1922L-F5# IBUTTON TEMP LOGGER
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
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