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DS18S20-PAR
DS18S20-PAR OPERATION EXAMPLE 1
In this example there is only one DS18S20-PAR on the bus. The master writes to the T H and T L registers
in the DS18S20-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
TX
RX
TX
TX
TX
TX
RX
TX
TX
RX
TX
RX
TX
TX
TX
DATA (LSB FIRST)
Reset
Presence
CCh
4Eh
2 data bytes
Reset
Presence
CCh
BEh
9 data bytes
Reset
Presence
CCh
48h
DQ line held high by
strong pullup
COMMENTS
Master issues reset pulse.
DS18S20-PAR responds with presence pulse.
Master issues Skip ROM command.
Master issues Write Scratchpad command.
Master sends two data bytes to scratchpad (T H and T L ).
Master issues reset pulse.
DS18S20-PAR responds with presence pulse.
Master issues Skip ROM command.
Master issues Read Scratchpad command.
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.
Master issues reset pulse.
DS18S20-PAR responds with presence pulse.
Master issues Skip ROM command.
Master issues Copy Scratchpad command.
Master applies strong pullup to DQ for at least 10 ms while copy
operation is in progress.
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