DS1631/DS1631A/DS1731
15 of 15
OPERATION EXAMPLE
In this example, the master configures the DS1631/DS1631A/DS1731 (A
1
A
2
A
3
= 000) for continuous
conversions and thermostatic function.
MASTER
MODE
THERMETER*
MODE
DATA
(MSb first)
COMMENTS
TX
RX
START
START condition from MASTER.
TX
RX
90h
MASTER sends control byte with R/W?/SPAN>?/SPAN> = 0.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
ACh
MASTER sends Access Config command.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
02h
MASTER writes a data byte to the configuration register to
put the THERMOMETER in continuous conversion mode
and set the T
OUT
polarity to active high.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
STOP
STOP condition from MASTER.
TX
RX
START
START condition from MASTER.
TX
RX
90h
MASTER sends control byte with R/W?/SPAN>?/SPAN> = 0.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
A1h
MASTER sends Access TH command.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
28h
MASTER sends most significant data byte for T
H
= +40癈.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
00h
MASTER sends least significant data byte for T
H
= +40癈.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
STOP
STOP condition from MASTER.
TX
RX
START
START condition from MASTER.
TX
RX
90h
MASTER sends control byte with R/W?/SPAN>?/SPAN> = 0.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
A2h
MASTER sends Access TL command.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
0Ah
MASTER sends most significant data byte for T
L
= +10癈.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
00h
MASTER sends least significant data byte for T
L
= +10癈.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
STOP
STOP condition from MASTER.
TX
RX
START
START condition from MASTER.
TX
RX
90h
MASTER sends control byte with R/W?/SPAN>?/SPAN> = 0.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
51h
MASTER sends Start Convert T command.
RX
TX
ACK
Acknowledge bit from THERMOMETER.
TX
RX
STOP
STOP condition from MASTER.
*THERMOMETER = DS1631, DS1631A, or DS1731
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