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參數(shù)資料
| 型號(hào)： | DS18S20Z/T&R |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 0.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 10/23頁 |
| 文件大小： | 252K |
| 代理商： | DS18S20Z/T&R |
DS18S20
18 of 23
DS18S20 OPERATION EXAMPLE 1
In this example there are multiple DS18S20s on the bus and they are using parasite power. The bus
master initiates a temperature conversion in a specific DS18S20 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
DS18S20s respond with presence pulse.
Tx
55h
Master issues Match ROM command.
Tx
64-bit ROM code
Master sends DS18S20 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
DS18S20s respond with presence pulse.
Tx
55h
Master issues Match ROM command.
Tx
64-bit ROM code
Master sends DS18S20 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.
DS18S20 OPERATION EXAMPLE 2
In this example there is only one DS18S20 on the bus and it is using parasite power. The master writes to
the TH and TL registers in the DS18S20 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
DS18S20 responds with presence pulse.
Tx
CCh
Master issues Skip ROM command.
Tx
4Eh
Master issues Write Scratchpad command.
Tx
2 data bytes
Master sends two data bytes to scratchpad (TH and TL)
Tx
Reset
Master issues reset pulse.
Rx
Presence
DS18S20 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
DS18S20 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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