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(yè)數(shù)： 11/23頁(yè)
文件大?。?/td> 252K
代理商： DS18S20Z/T&R
DS18S20
19 of 23
DS18S20 OPERATION EXAMPLE 3
In this example there is only one DS18S20 on the bus and it is using parasite power. The bus master
initiates a temperature conversion then reads the DS18S20 scratchpad and calculates a higher resolution
result using the data from the temperature, COUNT REMAIN and COUNT PER °C registers.
MASTER MODE
DATA (LSB FIRST)
COMMENTS
Tx
Reset
Master issues reset pulse.
Tx
Presence
DS18S20 responds with presence pulse.
Tx
CCh
Master issues Skip ROM command.
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
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. The master also calculates the
TEMP_READ value and stores the contents of the COUNT
REMAIN and COUNT PER °C registers.
Tx
Reset
Master issues reset pulse.
Rx
Presence
DS18S20 responds with presence pulse.
—
CPU calculates extended resolution temperature using the
equation in the Operation—Measuring Temperature section.
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