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DS1921G
Thermochron iButton Device
Step 1: Set the RTC
Let the actual time be 15:30:00 hours on Monday, the 1st of April in 2002. This results in the following data to be writ-
ten to the RTC registers:
ADDRESS
DATA
200h
00h
201h
30h
202h
15h
203h
01h
204h
81h
205h
04h
206h
02h
With only a single DS1921G connected to the bus master, the communication of step 1 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
00h
02h
<7 data bytes>
(Reset)
(Presence)
CCh
AAh
00h
02h
06h
<7 data bytes>
(Reset)
(Presence)
CCh
55h
00h
COMMENTS
Reset pulse (480 μs to 960 μs)
Presence pulse
Issue Skip ROM command
Issue Write Scratchpad command
TA1, beginning offset = 00h
TA2, address = 0200h
Write 7 bytes of data to scratchpad
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Read Scratchpad command
Read TA1, beginning offset = 00h
Read TA2, address = 0200h
Read E/S, ending offset = 6h, 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
06h
(Reset)
(Presence)
E/S
Reset pulse
Presence pulse
37
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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
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