Datasheet

MAX31850/MAX31851
Cold-Junction Compensated, 1-Wire
Thermocouple-to-Digital Converters
18Maxim Integrated
Figure 8. MAX31850/MAX31851 Function Commands Flowchart
44h
CONVERT T?
Y
N
PARASITE
POWER?
MASTER Tx
FUNCTION COMMAND
DEVICE BEGINS
CONVERSION
MASTER Rx
“1s”
MASTER Rx
“0s”
YN
MASTER ENABLES
STRONG PULLUP ON DQ
DEVICE CONVERTS
TEMPERATURE
MASTER DISABLES
STRONG PULLUP
DEVICE
CONVERTING
TEMPERATURE?
Y
N
MASTER Rx
“0s”
MASTER Rx
“1s”
YN
Y
MASTER Rx DATA BYTE
FROM SCRATCHPAD
RETURN TO INITIALIZATION SEQUENCE
FOR NEXT TRANSACTION
MASTER Rx
SCRATCHPAD CRC BYTE
Y
BEh
READ
SCRATCHPAD?
Y
B4h
READ
POWER SUPPLY?
PARASITE
POWER?
NN
Y
N
N
MASTER Tx
RESET?
HAVE 8 BYTES
BEEN READ?