DS18B20-SL DALLAS [Dallas Semiconductor], DS18B20-SL Datasheet - Page 14

• Manufacturer Part Number: DS18B20-SL
• Description: Programmable Resolution 1-Wire Digital Thermometer
• Manufacturer: DALLAS [Dallas Semiconductor]

Figure 12. DS18B20 Function Commands Flowchart
MASTER T
COMMAND
FUNCTION
MASTER
R
DS18B20 BEGINS
X
TEMPERATURE
N
CONVERTING
N
“1s”
CONVERSION
MASTER
DEVICE
R
Y
X
X
POWER SUPPLY
?
“0s”
POWERED
PARASITE
READ
B4h
?
?
Y
N
N
TEMPERATURE
MASTER
R
MASTER
Y
CONVERT
PARASITE
R
X
POWER
X
“0s”
“1s”
44h
?
?
Y
STRONG PULLUP ON DQ
Y
DS18B20 CONVERTS
N
MASTER DISABLES
MASTER ENABLES
STRONG PULLUP
TEMPERATURE
N
RECALL FROM E
MASTER BEGINS DATA
BUSY RECALLING
RECALL E
MASTER
DEVICE
R
SEQUENCE (FIGURE 11) FOR
Y
RETURN TO INITIALIZATION
DATA
B8h
X
?
?
“0s”
NEXT TRANSACTION
Y
2
2
PROM
14 of 22
N
MASTER
R
X
“1s”
PROGRESS
Y
MASTER
COPY IN
R
X
N
MASTER R
N
?
“0s”
MASTER R
FROM SCRATCHPAD
SCRATCHPAD
HAVE 8 BYTES
N
BEEN READ
CRC BYTE
T
MASTER
X
READ
X
RESET
BEh
SCRATCHPAD
X
?
?
?
SCRATCHPAD
N
DATA BYTE
N
Y
Y
PARASITE
POWER
MASTER
COPY
R
48h
X
?
?
“1s”
Y
Y
SCRATCHPAD TO EEPROM
STRONG PULL-UP ON DQ
DATA COPIED FROM
N
Y
MASTER DISABLES
MASTER ENABLES
STRONG PULLUP
MASTER T
N
MASTER T
MASTER T
TO SCRATCHPAD
TO SCRATCHPAD
TO SCRATCHPAD
SCRATCHPAD
X
WRITE
CONFIG. BYTE
4Eh
?
X
X
DS18B20
T
T
Y
L
H
BYTE
BYTE