DS1922T-F5# Maxim Integrated Products, DS1922T-F5# Datasheet - Page 49

• Manufacturer Part Number: DS1922T-F5#
• Description: IBUTTON TEMP LOGGER
• Manufacturer: Maxim Integrated Products
• Series: iButton®r

Specifications of DS1922T-F5#

• Rohs Information: IButton RoHS Compliance Plan
• Memory Size: 512B
• Memory Type: NVSRAM (Non-Volatile SRAM)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

With only a single device connected to the bus master,
the communication of step 2 looks like this:
Step 3: Start the new mission.
With only a single device connected to the bus master,
the communication of step 3 looks like this:
MASTER MODE
MASTER MODE
______________________________________________________________________________________
Rx
Rx
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
Tx
Tx
Tx
Tx
Tx
Tx
Temperature Logger iButton with 8KB
DATA (LSB FIRST)
DATA (LSB FIRST)
<25 Data Bytes>
<32 Data Bytes>
<7 FFh Bytes>
<8 FFh Bytes>
<8 FFh Bytes>
(Presence)
(Presence)
(Presence)
(Presence)
(Presence)
(Presence)
(Reset)
(Reset)
(Reset)
(Reset)
(Reset)
(Reset)
CCh
CCh
AAh
CCh
CCh
CCh
0Fh
00h
02h
00h
02h
1Fh
99h
00h
02h
1Fh
FFh
If step 3 was successful, the MIP bit in the General
Status register is 1, the MEMCLR bit is 0, and the
Mission Start Delay counts down.
Data-Log Memory
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
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Start Mission” command
Send dummy password
Send dummy byte
Reset pulse
Presence pulse
(AUTHORIZATION CODE)
COMMENTS
COMMENTS
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