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DS1922L 데이터시트(PDF) 13 Page - Dallas Semiconductor

부품명 DS1922L
상세설명  Temperature Logger iButton With 8kB Datalog Memory
PDF  48 Pages
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제조업체  DALLAS [Dallas Semiconductor]
홈페이지  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1922L 데이터시트(HTML) 13 Page - Dallas Semiconductor

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DS1922L/DS1922T
13 of 48
Figure 2. Hierachical Structure for 1-Wire Protocol
1-Wire net
Other
Devices
BUS
Master
DS1922L, DS1922T
Available
Commands:
Command
Level:
Data Field
Affected:
1-Wire ROM Function
Commands
DS1922-Specific
Memory Function
Commands
Read ROM
Match ROM
Search ROM
Conditional Search ROM
Skip ROM
Resume
Overdrive Skip
Overdrive Match
64-bit ROM, RC-Flag
64-bit ROM, RC-Flag
64-bit ROM, RC-Flag
64-bit ROM, RC-Flag, Alarm Flags,
Search Conditions
RC-Flag
RC-Flag
RC-Flag, OD-Flag
64-bit ROM, RC-Flag, OD-Flag
Write Scratchpad
Read Scratchpad
Copy Scratchpad w/PW
Read Memory w/PW &
w/CRC
Clear Memory w/PW
Forced Conversion
Start Mission w/PW
Stop Mission w/PW
256-bit Scratchpad, Flags
256-bit Scratchpad
512 byte Data Memory, Registers,
Flags, Passwords
Memory, Registers, Passwords
Mission Time Stamp, Mission Samples
Counter, Start Delay, Alarm
Flags, Passwords
Memory addresses 020Ch to 020Dh
Flags, Timestamp, Memory addresses
020Ch to 020Dh (when logging)
Flags
Figure 3. 64-Bit Lasered ROM
MSB
LSB
8-Bit
CRC Code
48-Bit Serial Number
8-Bit Family
Code (41h)
MSB
LSB
MSB
LSB
MSB
LSB
Figure 4. 1-Wire CRC Generator
X
0
X
1
X
2
X
3
X
4
X
5
X
6
X
7
X
8
Polynomial = X
8 + X5 + X4 + 1
1
st
STAGE
2
nd
STAGE
3
rd
STAGE
4
th
STAGE
6
th
STAGE
5
th
STAGE
7
th
STAGE
8
th
STAGE
INPUT DATA



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