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DS1921G
Thermochron iButton Device
Command-Specific 1-Wire Communication Protocol—Legend
(continued)
SYMBOL
<data>
CRC-16
FF loop
AA loop
Busy
00 loop
DESCRIPTION
Transfer of an undetermined amount of data
Transfer of an inverted CRC-16
Indefinite loop where the master reads FFh bytes
Indefinite loop where the master reads AAh bytes
Interval during Copy Scratchpad where the DS1921G does not respond. Any bits read during this time
are logic 1.
Indefinite loop where the master reads 00h bytes
Command-Specific 1-Wire Communication Protocol—Color Codes
Master-to-Slave
Slave-to-Master
1-Wire Communication Examples
Write Scratchpad, Reaching the End of the Scratchpad
RST PD Select WS
TA
<data to EOS> CRC-16
FF loop
Write Scratchpad, Not Reaching the End of the Scratchpad
RST PD Select WS
Read Scratchpad
TA <data> RST PD
RST PD Select RS
TA-E/S
<data to EOS> CRC-16
FF loop
Copy Scratchpad (Success)
RST PD Select CPS
TA-E/S
Busy
AA loop
Copy Scratchpad (Invalid TA-E/S)
RST PD Select CPS
TA-E/S
FF loop
Read Memory (Success)
RST PD Select RM
TA <data to EOM>
00 loop
Read Memory (Invalid Address)
RST PD Select RM
TA
00 loop
Reading reserved pages 20 through 63 or 68 through 127 or pages 192 and higher (beyond data-log memory)
results in 00h bytes.
Maxim Integrated
35
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相关PDF资料
DS1921H-F5# IBUTTON THERMOCHRON F5
DS1921K# KIT IBUTTON THERMOCHRON
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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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