DS1920-F3 Maxim Integrated Products, DS1920-F3 Datasheet - Page 17

• Manufacturer Part Number: DS1920-F3
• Description: Temperature Ibutton
• Manufacturer: Maxim Integrated Products

DS1920 MEMORY AND CONTROL FUNCTION COMMANDS Table 2
NOTES:
1. Temperature conversion takes up to 0.5 seconds. After receiving the Convert Temperature command,
2. After receiving the Copy Scratchpad command, the data line for the DS1920 must be held high for at
READ/WRITE TIMING DIAGRAM Figure 11
Write-1 Time Slot
INSTRUCTION
Convert
Temperature
Read Scratchpad
Write Scratchpad
Copy Scratchpad
Recall
the data line for the DS1920 must be held high for at least 0.5 seconds to provide power during the
conversion process. As such, no other activity may take place on the 1-Wire bus for at least this
period after a Convert Temperature command has been issued.
least 10 ms to provide power during the copy process. As such, no other activity may take place on
the 1-Wire bus for at least this period after a Copy Scratchpad command has been issued.
DESCRIPTION
Initiates temperature
conversion
Reads bytes from scratchpad
and reads CRC byte.
Writes bytes into scratchpad
at addresses 2 and 3 (TH and
TL temperature triggers).
Copies Scratchpad into
nonvolatile memory
(addresses 2 and 3 only).
Recalls values stored in
nonvolatile memory into
scratchpad (temperature
triggers).
TEMPERATURE CONVERSION COMMANDS
RESISTOR
MASTER
MEMORY COMMANDS
17 of 22
60 s
1 s
1 s
PROTOCOL
t
t
t
REC
LOW1
SLOT
BEH
B8H
4EH
44H
48H
<
< 120 s
< 15 s
1-WIRE BUS
AFTER ISSUING
PROTOCOL
bytes at addr. 2 and
<read up to 9 data
<write data into 2
strong pullup
strong pullup
addr. 3>
bytes>
idle
NOTES
DS1920
1
2