DS1922E Maxim, DS1922E Datasheet - Page 40
DS1922E
Manufacturer Part Number
DS1922E
Description
The DS1922E temperature logger iButton is a rugged, self-sufficient system that measures temperature and records the result in a protected memory section
Manufacturer
Maxim
Datasheet
1.DS1922E.pdf
(44 pages)
- Current page: 40 of 44
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High-Temperature Logger iButton with 8KB
Data-Log Memory
Assumption: The previous mission has been ended by
using the Stop Mission command. Passwords are not
enabled.
Starting a mission requires three steps:
40
To read the result and to verify success, read the addresses 020Ch to 020Fh (results) and the device samples
counter at address 0223h to 0225h. If the count has incremented, the command was executed successfully.
Start Mission with Password
Stop Mission with Password
Forced Conversion
To verify success, read the General Status register at address 0215h. If MIP is 1 and MEMCLR is 0, the command
was executed successfully.
To verify success, read the General Status register at address 0215h. If MIP is 0, the command was executed
successfully.
RST
RST
RST
______________________________________________________________________________________
PD
PD
PD
MASTER MODE
Select
Select
Select
Mission Example: Prepare
and Start a New Mission
Rx
Rx
Tx
Tx
Tx
Tx
Tx
Tx
STP
SM
FC
FFh
<PW/Dummy>
<PW/Dummy>
FF Loop
FFh
FFh
1-Wire Communication Examples (continued)
FF Loop
FF Loop
DATA (LSB FIRST)
<8 FFh bytes>
(Presence)
(Presence)
(Reset)
(Reset)
CCh
96h
FFh
Step 1: Clear the data of the previous mission.
With only a single device connected to the bus master,
the communication of step 1 looks like this:
Step 1: Clear the data of the previous mission.
Step 2: Write the setup data to register page 1.
Step 3: Start the new mission.
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Clear Memory” command
Send dummy password
Send dummy byte
Reset pulse
Presence pulse
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