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DS18B20-PAR
 
16 of 19 
MASTER MODE
DATA (LSB FIRST)
COMMENTS
RX
9 data bytes
Master reads entire scratchpad including CRC. The master
then recalculates the CRC of the first eight data bytes from the
scratchpad and compares the calculated CRC with the read
CRC (byte 9). If they match, the master continues; if not, the
read operation is repeated.
 
DS18B20-PAR OPERATION EXAMPLE 2 
In this example there is only one DS18B20-PAR on the bus. The master writes to the T
H
, T
L
, and
configuration registers in the DS18B20-PAR scratchpad and then reads the scratchpad and recalculates
the CRC to verify the data. The master then copies the scratchpad contents to EEPROM.
 
MASTER MODE    DATA (LSB FIRST)
COMMENTS
TX
Reset
Master issues reset pulse.
RX
Presence
DS18B20-PAR responds with presence pulse.
TX
CCh
Master issues Skip ROM command.
TX
4Eh
Master issues Write Scratchpad command.
TX
3 data bytes
Master sends three data bytes to scratchpad (T
H
, T
L
, and config).
TX
Reset
Master issues reset pulse.
RX
Presence
DS18B20-PAR responds with presence pulse.
TX
CCh
Master issues Skip ROM command.
TX
BEh
Master issues Read Scratchpad command.
RX
9 data bytes
Master reads entire scratchpad including CRC. The master then
recalculates the CRC of the first eight data bytes from the
scratchpad and compares the calculated CRC with the read CRC
(byte 9). If they match, the master continues; if not, the read
operation is repeated.
TX
Reset
Master issues reset pulse.
RX
Presence
DS18B20-PAR responds with presence pulse.
TX
CCh
Master issues Skip ROM command.
TX
48h
Master issues Copy Scratchpad command.
TX
DQ line held high by
strong pullup
Master applies strong pullup to DQ for at least 10 ms while copy
operation is in progress.
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