Datasheet

DS18S20-PAR
10 of 20
DS18S20-PAR FUNCTION COMMAND SET Table 4
Command Description Protocol
1-Wire Bus Activity
After Command is Issued Notes
TEMPERATURE CONVERSION COMMANDS
Convert T Initiates temperature
conversion.
44h None 1
MEMORY COMMANDS
Read Scratchpad Reads the entire scratchpad
including the CRC byte.
BEh DS18S20-PAR transmits up
to 9 data bytes to master.
2
Write Scratchpad Writes data into scratchpad
bytes 2 and 3 (T
H
and T
L
).
4Eh Master transmits 2 data
bytes to DS18S20-PAR.
3
Copy Scratchpad Copies T
H
and T
L
data from the
scratchpad to EEPROM.
48h None 1
Recall E
2
Recalls T
H
and T
L
data from
EEPROM to the scratchpad.
B8h DS18S20-PAR transmits
recall status to master.
NOTES:
1. The master must enable a strong pullup on the 1-Wire bus during temperature conversions and copies
from the scratchpad to EEPROM. No other bus activity may take place during this time.
2. The master can interrupt the transmission of data at any time by issuing a reset.
3. Both bytes must be written before a reset is issued.