Data Sheet

DS18B20
18 of 27
INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES” Figure 11
DS18B20 COMMAND SET Table 4
INSTRUCTION DESCRIPTION PROTOCOL
1-WIRE BUS
AFTER ISSUING
PROTOCOL NOTES
TEMPERATURE CONVERSION COMMANDS
Convert T Initiates temperature
conversion.
44h <read temperature busy
status>
1
MEMORY COMMANDS
Read Scratchpad Reads bytes from
scratchpad and reads
CRC byte.
BEh <read data up to 9 bytes>
Write Scratchpad Writes bytes into
scratchpad at addresses 2
through 4 (TH and TL
temperature triggers and
config).
4Eh <write data into 3 bytes
at addr. 2 through. 4>
3
Copy Scratchpad Copies scratchpad into
nonvolatile memory
(addresses 2 through 4
only).
48h <read copy status> 2
Recall E
2
Recalls values stored in
nonvolatile memory into
scratchpad (temperature
triggers).
B8h <read temperature busy
status>
Read Power Supply Signals the mode of
DS18B20 power supply
to the master.
B4h <read supply status>