DS2422 Maxim, DS2422 Datasheet - Page 47

• Manufacturer Part Number: DS2422
• Description: The DS2422 temperature/data logger combines the core functions of a fully featured data logger in a single chip
• Manufacturer: Maxim

STEP 2
During the setup, the device needs to learn the following information:
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The following data will setup the DS2422 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.
With only a single DS2422 connected to the bus master, the communication of step 2 looks like this:
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
020Ch
020Dh
020Eh
020Fh
0200h
0201h
0202h
0203h
0204h
0205h
0206h
0207h
0208h
0209h
0210h
0211h
0212h
0213h
0214h
0215h
0216h
0217h
0218h
MASTER MODE
RX
TX
TX
TX
TX
TX
TX
DATA
FCh
C1h
0Ah
FFh
FFh
FFh
FFh
FFh
FFh
FFh
5Ah
00h
30h
15h
01h
04h
02h
00h
52h
66h
00h
02h
01h
00h
00h
Enable high alarm
Normal start; no rollover; 8-bit temp. log
15:30:00 hours
1
Every 10 minutes (EHSS = 0)
0°C low
10°C high
(Don’t care)
(Don’t care)
Disabled
On (enabled), EHSS = 0 (low sample rate)
(Don’t care)
90 minutes
st
of April in 2002
DATA (LSB FIRST)
<25 data bytes>
(Presence)
EXAMPLE VALUES
(Reset)
CCh
0Fh
00h
02h
47 of 49
Reset pulse
Presence pulse
Issue “skip ROM” command
Issue “write scratchpad” command
TA1, beginning offset=00h
TA2, address=0200h
Write 25 bytes of data to scratchpad
Temp. Alarm Control
Time
Date
Sample rate
Temperature Alarm
Threshold
External Data Alarm
Threshold
Clock through read-only registers
Data Alarm Control
RTC Oscillator Control, sample
rate selection
General Mission Control
Clock through
read-only registers
Mission Start Delay
COMMENTS
FUNCTION