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DS1921G
Thermochron iButton Device
Step 2: Clear the data of the previous mission
Set the EMCLR bit to 1, enable the RTC, and then execute the Clear Memory command. The RTC oscillator must be
stable before the Clear Memory command is issued. Wait 500μs after issuing the Clear Memory command before
proceeding to step 3. This results in the following data to be written to the Status register:
ADDRESS
DATA
20Eh
40h
With only a single DS1921G connected to the bus master, the communication of step 2 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
40h
(Reset)
(Presence)
CCh
AAh
0Eh
02h
0Eh
40h
(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 status byte 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 = 0Eh, 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)
38
Tx
Tx
Rx
Tx
Tx
Tx
Rx
0Eh
(Reset)
(Presence)
CCh
3Ch
(Reset)
(Presence)
E/S
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Clear Memory command
Reset pulse
Presence pulse
Maxim Integrated
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相关PDF资料
DS1921H-F5# IBUTTON THERMOCHRON F5
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DS1961S-F3# IBUTTON EEPROM 1KBit F3
DS1963S-F5+ IBUTTON MONETARY SHA-1
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