Datasheet
DS1922L/DS1922T
Temperature Logger iButton with 8KB
Data-Log Memory
48 ______________________________________________________________________________________
Step 2: Write the setup data to register page 1.
During the setup, the device needs to learn the follow-
ing information:
• 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
The following data sets up the DS1922L for a mission
that logs temperature using 8-bit format.
ADDRESS DATA EXAMPLE VALUES FUNCTION
0200h 00h
0201h 30h
0202h 15h
15:30:00 hours Time
0203h 01h
0204h 04h
0205h 02h
1st of April in 2002 Date
0206h 0Ah
0207h 00h
Every 10 minutes (EHSS = 0) Sample rate
0208h 52h
0209h 66h
0°C low
10°C high
Temperature Alarm Thresholds
020Ah 00h
020Bh FFh
(Don’t care) (Not applicable with DS1922L/DS1922T)
020Ch FFh
020Dh FFh
020Eh FFh
020Fh FFh
(Don’t care) Clock through read-only registers
0210h 02h Enable high alarm Temperature Alarm Control
0211h FCh Disabled (Not applicable with DS1922L/DS1922T)
0212h 01h On (enabled), EHSS = 0 (low sample rate) RTC Oscillator Control, sample rate selection
0213h C1h Normal start; no rollover; 8-bit temperature log General Mission Control
0214h FFh
0215h FFh
(Don’t care) Clock through read-only registers
0216h 5Ah
0217h 00h
0218h 00h
90 minutes Mission Start Delay