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DS1822 데이터시트(PDF) 13 Page - Dallas Semiconductor

부품명 DS1822
상세설명  Econo 1-Wire Digital Thermometer
PDF  20 Pages
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제조업체  DALLAS [Dallas Semiconductor]
홈페이지  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1822 데이터시트(HTML) 13 Page - Dallas Semiconductor

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DS1822
13 of 20
DS1822 FUNCTION COMMANDS FLOW CHART Figure 12
MASTER TX
FUNCTION
COMMAND
Y
N
44h
CONVERT
TEMPERATURE
?
PARASITE
POWER
?
N
Y
DS1822 BEGINS
CONVERSION
DEVICE
CONVERTING
TEMPERATURE
?
N
Y
MASTER
RX “0s”
MASTER
RX “1s”
MASTER ENABLES
STRONG PULLUP ON DQ
DS1822 CONVERTS
TEMPERATURE
MASTER DISABLES
STRONG PULLUP
Y
N
48h
COPY
SCRATCHPAD
?
PARASITE
POWER
?
N
Y
MASTER ENABLES
STRONG PULL-UP ON DQ
DATA COPIED FROM
SCRATCHPAD TO EEPROM
MASTER DISABLES
STRONG PULLUP
MASTER
RX “0s”
COPY IN
PROGRESS
?
Y
MASTER
RX “1s”
N
RETURN TO INITIALIZATION
SEQUENCE (FIGURE 11) FOR
NEXT TRANSACTION
B4h
READ
POWER SUPPLY
?
Y
N
PARASITE
POWERED
?
N
MASTER
RX “1s”
MASTER
RX “0s”
Y
MASTER TX TH BYTE
TO SCRATCHPAD
Y
N
4Eh
WRITE
SCRATCHPAD
?
MASTER TX TL BYTE
TO SCRATCHPAD
MASTER TX CONFIG. BYTE
TO SCRATCHPAD
Y
N
Y
BEh
READ
SCRATCHPAD
?
HAVE 8 BYTES
BEEN READ
?
N
MASTER
TX RESET
?
MASTER RX DATA BYTE
FROM SCRATCHPAD
N
Y
MASTER RX SCRATCHPAD
CRC BYTE
MASTER
RX “1s”
Y
N
B8h
RECALL E
2
?
MASTER BEGINS DATA
RECALL FROM E
2 PROM
DEVICE
BUSY RECALLING
DATA
?
N
Y
MASTER
RX “0s”



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