DS1825 Maxim Integrated Products, DS1825 Datasheet - Page 14

• Manufacturer Part Number: DS1825
• Description: Programmable Resolution 1-Wire Digital Thermometer
• Manufacturer: Maxim Integrated Products

Figure 12. DS1825 FUNCTION COMMANDS FLOW CHART
MASTER T
COMMAND
FUNCTION
MASTER
R
X
TEMPERATURE
DS1825 BEGINS
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
R
PARASITE
X
POWER
X
“0s”
“1s”
44h
?
?
Y
STRONG PULLUP ON DQ
Y
N
DS1825 CONVERTS
MASTER DISABLES
MASTER ENABLES
STRONG PULLUP
TEMPERATURE
N
RECALL FROM E
MASTER BEGINS DATA
BUSY RECALLING
RECALL E
MASTER
DEVICE
SEQUENCE (FIGURE 11) FOR
R
Y
RETURN TO INITIALIZATION
DATA
B8h
X
?
?
“0s”
NEXT TRANSACTION
Y
2
2
PROM
14 of 21
N
MASTER
R
X
“1s”
PROGRESS
Y
COPY IN
MASTER
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
Y
N
Y
PARASITE
POWER
MASTER
COPY
R
48h
X
?
?
“1s”
Y
Y
SCRATCHPAD TO EEPROM
STRONG PULL-UP ON DQ
N
DATA COPIED FROM
Y
MASTER DISABLES
MASTER ENABLES
STRONG PULLUP
MASTER T
N
MASTER T
MASTER T
TO SCRATCHPAD
TO SCRATCHPAD
TO SCRATCHPAD
SCRATCHPAD
WRITE
X
4Eh
CONFIG. BYTE
?
X
X
T
T
Y
H
L
BYTE
BYTE