參數(shù)資料
型號: DS1820
英文描述: 1-Wire Digital Thermometer
文件頁數(shù): 22/27頁
文件大?。?/td> 151K
代理商: DS1820
DS1820
030598 22/27
MEMORY FUNCTION EXAMPLE
Table 4
Example: Bus Master writes memory (parasite power and only one DS1820 assumed).
MASTER MODE
DATA (LSB FIRST)
COMMENTS
TX
Reset
Reset pulse.
RX
Presence
Presence pulse.
TX
CCh
Skip ROM command.
TX
4Eh
Write Scratchpad command.
TX
<2 data bytes>
Writes two bytes to scratchpad (TH and TL).
TX
Reset
Reset pulse.
RX
Presence
Presence pulse.
TX
CCh
Skip ROM command.
TX
BEh
Read Scratchpad command.
RX
<9 data bytes>
Read entire scratchpad plus CRC. The master now recal-
culates the CRC of the eight data bytes received from the
scratchpad, compares the CRC and the two other bytes
read back from the scratchpad. If data match, the master
continues; if not, repeat the sequence.
TX
Reset
Reset pulse.
RX
Presence
Presence pulse.
TX
CCh
Skip ROM command.
TX
48h
Copy Scratchpad command; after issuing this command,
the master must wait 6 ms for copy operation to complete.
TX
Reset
Reset pulse.
RX
Presence
Presence pulse, done.
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參數(shù)描述
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