DS1922T-F5 MAXIM [Maxim Integrated Products], DS1922T-F5 Datasheet - Page 14

• Manufacturer Part Number: DS1922T-F5
• Description: Temperature Logger iButton With 8kB Datalog Memory
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 2. Hierachical Structure for 1-Wire Protocol
Figure 3. 64-Bit Lasered ROM
MSB
MSB
Figure 4. 1-Wire CRC Generator
X
0
STAGE
CRC Code
1
st
8-Bit
X
1
LSB
STAGE
Master
Command
Level:
2
BUS
nd
1-Wire ROM Function
MSB
X
Memory Function
DS1922-Specific
2
STAGE
Commands
Commands
3
rd
X
3
STAGE
4
th
1-Wire net
Polynomial = X
48-Bit Serial Number
DS1922L, DS1922T
Available
Commands:
Read ROM
Match ROM
Search ROM
Conditional Search ROM
Skip ROM
Resume
Overdrive Skip
Overdrive Match
Write Scratchpad
Read Scratchpad
Copy Scratchpad w/PW
Read Memory w/PW &
Clear Memory w/PW
Forced Conversion
Start Mission w/PW
Stop Mission w/PW
w/CRC
X
8
14 of 50
4
+ X
STAGE
5
5
th
+ X
4
+ 1
Data Field
Affected:
64-bit ROM, RC-Flag
64-bit ROM, RC-Flag
64-bit ROM, RC-Flag
64-bit ROM, RC-Flag, Alarm Flags,
RC-Flag
RC-Flag
RC-Flag, OD-Flag
64-bit ROM, RC-Flag, OD-Flag
256-bit Scratchpad, Flags
256-bit Scratchpad
512 byte Data Memory, Registers,
Memory, Registers, Passwords
Mission Time Stamp, Mission Samples
Memory addresses 020Ch to 020Dh
Flags, Timestamp, Memory addresses
Flags
Devices
Other
Search Conditions
Flags, Passwords
Counter, Start Delay, Alarm
Flags, Passwords
020Ch to 020Dh (when logging)
LSB
X
5
STAGE
6
MSB
th
8-Bit Family
Code (41h)
INPUT DATA
X
6
STAGE
7
th
LSB
LSB
X
DS1922L/DS1922T
7
STAGE
8
th
X
8