Datasheet

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.
*THERMOMETER = DS1631, DS1631A, or DS1731
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 = 0.
RX TX ACK Acknowledge bit from THERMOMETER.
TX RX ACh MASTER sends Access Cong command.
RX TX ACK Acknowledge bit from THERMOMETER.
TX RX 02h
MASTER writes a data byte to the conguration 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 = 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 signicant data byte for T
H
= +40°C.
RX TX ACK Acknowledge bit from THERMOMETER.
TX RX 00h MASTER sends least signicant data byte for T
H
= +40°C.
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 = 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 signicant data byte for T
L
= +10°C.
RX TX ACK Acknowledge bit from THERMOMETER.
TX RX 00h MASTER sends least signicant data byte for T
L
= +10°C.
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 = 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.
DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
www.maximintegrated.com
Maxim Integrated │ 12