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DS1920
DS1920 MEMOR Y AND CONTROL FUNCTION COMMANDS Table 2
1-Wire BUS
INSTRUCTION
DESCRIPTION
PROTOCOL
AFTER ISSUING
NOTES
PROTOCOL
TEMPERATURE CONVERSION COMMANDS
Convert
Temperature
Initiates temperature
conversion
44h
strong pullup
1
MEMORY COMMANDS
Read Scratchpad
Write Scratchpad
Reads bytes from scratchpad
and reads CRC byte.
Writes bytes into scratchpad
at addresses 2 and 3 (TH and
TL temperature triggers).
BEh
4Eh
<read up to 9 data
bytes>
<write data into 2
bytes at addr. 2 and
addr. 3>
Copies Scratchpad into
Copy Scratchpad
nonvolatile memory
48h
strong pullup
2
(addresses 2 and 3 only).
Recalls values stored in
Recall
nonvolatile memory into
scratchpad (temperature
B8h
idle
triggers).
NOTES:
1. Temperature conversion takes up to 0.75 seconds. After receiving the Convert Temperature
command, the data line for the DS1920 must be held high for at least 0.75 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.
2. After receiving the Copy Scratchpad command, the data line for the DS1920 must be held high for at
least 10ms 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.
READ/WRITE TIMING DIAGRAM Figure 11
Write-1 Time Slot
RESISTOR
MASTER
60 μ s ≤ t SLOT < 120 μ s
1 μ s ≤ t LOW1 < 15 μ s
1 μ s ≤ t REC < ∞
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