Datasheet

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MAX31826
1-Wire Digital Temperature Sensor
with 1Kb Lockable EEPROM
Figure 8. MAX31826 Function Commands Flowchart
44h
CONVERT T?
Y
N
PARASITE
POWER?
MASTER Tx
FUNCTION COMMAND
MAX31826 BEGINS
CONVERSION
MASTER Tx
START ADDRESS
MASTER Tx
TOKEN A5h
MASTER Rx DATA BYTE
FROM EEPROM
MASTER Rx
“1s”
MASTER Rx
“0s”
YN
MASTER ENABLES
STRONG PULLUP ON DQ
MAX31826 CONVERTS
TEMPERATURE
MASTER DISABLES
STRONG PULLUP
MASTER ENABLES
STRONG PULLUP ON DQ
DATA COPIED FROM
SCRATCHPAD 2 TO EEPROM
MASTER DISABLES
STRONG PULLUP
DATA COPIED FROM
SCRATCHPAD 2 TO EEPROM
DEVICE
CONVERTING
TEMPERATURE?
Y
N
MASTER Rx
“0s”
MASTER Rx
“1s”
55h
COPY
SCRATCHPAD 2?
N
PARASITE
POWER?
YN
YN
N
F0h
READ
MEMORY?
Y
N
Y
MASTER Tx
RESET?
MASTER Tx EEPROM
PAGE ADDRESS
0Fh
WRITE
SCRATCHPAD 2?
Y
MASTER Tx 8 DATA
BYTES
MASTER Rx
CRC BYTE
MASTER Tx
START ADDRESS
AAh
READ
SCRATCHPAD 2?
YY
MASTER Rx DATA BYTE
FROM SCRATCHPAD 2
MASTER Rx DATA BYTE
FROM SCRATCHPAD 1
RETURN TO INITIALIZATION SEQUENCE
FOR NEXT TRANSACTION
MASTER Rx
SCRATCHPAD 2 CRC BYTE
Y
N
N
N
MASTER Tx
RESET?
Y
MASTER Rx
SCRATCHPAD 1 CRC BYTE
Y
HAVE 8 BYTES
BEEN READ?
BEh
READ
SCRATCHPAD 1?
Y
N
B4h
READ
POWER SUPPLY?
PARASITE
POWER?
NN
Y
N
N
MASTER Tx
RESET?
HAVE 8 BYTES
BEEN READ?