DS1922T-F5 MAXIM [Maxim Integrated Products], DS1922T-F5 Datasheet - Page 46

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

MISSION EXAMPLE: PREPARE AND START A NEW MISSION
Assumption: The previous mission has been ended by using the Stop Mission command. Passwords are not
enabled. The device is a DS1922L.
Starting a mission requires three steps:
STEP 1
Clear the previous mission.
With only a single device connected to the bus master, the communication of step 1 looks like this:
STEP 2
During the setup, the device needs to learn the following information:
The following data will setup the DS1922L for a mission that logs temperature using 8-bit format. Such a mission
could last up to 56 days until the 8192-byte datalog memory is full.
Step 1: Clear the data of the previous mission
Step 2: Write the setup data to register page 1
Step 3: Start the mission
ADDRESS
Time and Date
Sample Rate
Alarm Thresholds
Alarm Controls (Response to Conditional Search)
General Mission Parameters (e. g., channels to log and logging format, rollover, start mode)
Mission Start Delay
020Ah
020Bh
0200h
0201h
0202h
0203h
0204h
0205h
0206h
0207h
0208h
0209h
MASTER MODE
RX
RX
TX
TX
TX
TX
TX
TX
DATA
0Ah
00h
30h
15h
01h
04h
02h
00h
52h
66h
00h
FFh
15:30:00 hours
1
Every 10 minutes (EHSS = 0)
0°C low
10°C high
(Don’t care)
st
of April in 2002
DATA (LSB FIRST)
<8 FFh bytes>
(Presence)
(Presence)
EXAMPLE VALUES
(Reset)
(Reset)
CCh
FFh
96h
46 of 50
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Clear Memory” command
Send dummy password
Send dummy byte
Reset pulse
Presence pulse
Time
Date
Sample rate
Temperature Alarm
Threshold
(Not applicable with DS1922L/T)
(Not applicable with DS1922L/T)
COMMENTS
FUNCTION
DS1922L/DS1922T