參數(shù)資料
型號: DS1820
英文描述: 1-Wire Digital Thermometer
文件頁數(shù): 21/27頁
文件大小: 151K
代理商: DS1820
DS1820
030598 21/27
MEMORY FUNCTION EXAMPLE
Table 3
Example: Bus Master initiates temperature conversion, then reads temperature (parasite power assumed).
MASTER MODE
DATA (LSB FIRST)
COMMENTS
TX
Reset
Reset pulse (480–960
μ
s).
RX
Presence
Presence pulse.
TX
55h
Issue “Match ROM” command.
TX
<64–bit ROM code>
Issue address for DS1820.
TX
44h
Issue “Convert T” command.
TX
<I/O LINE HIGH>
I/O line is held high for at least 500 ms by bus master to
allow conversion to complete.
TX
Reset
Reset pulse.
RX
Presence
Presence pulse.
TX
55h
Issue “Match ROM” command.
TX
<64–bit ROM code>
Issue address for DS1820.
TX
BEh
Issue “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 calculated and the CRC
read. If they match, the master continues; if not, this read
operation is repeated.
TX
Reset
Reset Pulse.
RX
Presence
Presence pulse, done.
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