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DS18B20 データシート(PDF) 18 Page - Dallas Semiconductor

部品番号 DS18B20
部品情報  Programmable Resolution 1-Wire Digital Thermometer
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メーカー  DALLAS [Dallas Semiconductor]
ホームページ  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS18B20 データシート(HTML) 18 Page - Dallas Semiconductor

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DS18B20
18 of 22
DS18B20 OPERATION EXAMPLE 1
In this example there are multiple DS18B20s on the bus and they are using parasite power. The bus
master initiates a temperature conversion in a specific DS18B20 and then reads its scratchpad and
recalculates the CRC to verify the data.
MASTER MODE
DATA (LSB FIRST)
COMMENTS
Tx
Reset
Master issues reset pulse.
Rx
Presence
DS18B20s respond with presence pulse.
Tx
55h
Master issues Match ROM command.
Tx
64-bit ROM code
Master sends DS18B20 ROM code.
Tx
44h
Master issues Convert T command.
Tx
DQ line held high by
strong pullup
Master applies strong pullup to DQ for the duration of the
conversion (tCONV).
Tx
Reset
Master issues reset pulse.
Rx
Presence
DS18B20s respond with presence pulse.
Tx
55h
Master issues Match ROM command.
Tx
64-bit ROM code
Master sends DS18B20 ROM code.
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.
DS18B20 OPERATION EXAMPLE 2
In this example there is only one DS18B20 on the bus and it is using parasite power. The master writes to
the TH, TL, and configuration registers in the DS18B20 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 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 (TH, TL, and config).
Tx
Reset
Master issues reset pulse.
Rx
Presence
DS18B20 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 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 10ms while copy
operation is in progress.


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