DS1922T-F5 MAXIM [Maxim Integrated Products], DS1922T-F5 Datasheet - Page 47

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

With only a single device connected to the bus master, the communication of step 2 looks like this:
ADDRESS
020Ch
020Dh
020Eh
020Fh
0210h
0211h
0212h
0213h
0214h
0215h
0216h
0217h
0218h
MASTER MODE
RX
RX
RX
RX
RX
RX
RX
RX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
DATA
FFh
FFh
FFh
FCh
C1h
FFh
5Ah
FFh
02h
01h
FFh
00h
00h
(Don’t care)
Enable high alarm
Disabled
On (enabled), EHSS = 0 (low sample rate)
Normal start; no rollover; 8-bit temp. log
(Don’t care)
90 minutes
DATA (LSB FIRST)
<25 data bytes>
<32 data bytes>
<7 FFh bytes>
<8 FFh bytes>
(Presence)
(Presence)
(Presence)
(Presence)
EXAMPLE VALUES
(Reset)
(Reset)
(Reset)
(Reset)
CCh
CCh
CCh
AAh
0Fh
1Fh
1Fh
00h
02h
00h
02h
99h
00h
02h
47 of 50
COMMENTS
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
Write through the end of the scratchpad
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Read Scratchpad” command
Read TA1, beginning offset = 00h
Read TA2, address = 0200h
Read E/S, ending offset = 1Fh, flags = 0h
Read scratchpad data and verify
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Copy Scratchpad” command
TA1
TA2
E/S
Send dummy password
Reset pulse
Presence pulse
(AUTHORIZATION CODE)
Clock through
read-only registers
Temperature Alarm Control
(Not applicable with DS1922L/T)
RTC Oscillator Control, sample
rate selection
General Mission Control
Clock through
read-only registers
Mission Start Delay
FUNCTION
DS1922L/DS1922T