Rainbow Electronics DS1721 User Manual
Page 12
DS1721
12 of 16
SAMPLE COMMAND SEQUENCE Table 5
Example: After power-up, initiates a temperature conversion, bus master reads temperature
BUS MASTER
MODE
DS1721
MODE
DATA (MSB
FIRST)
COMMENTS
TX
RX
START
Bus Master initiates a START condition
TX
RX
<address, 0>
Bus Master sends DS1721 address; R/
W
= 0
RX
TX
ACK
DS1721 generates acknowledge bit
TX
RX
51h
Bus Master sends start convert T protocol
RX
TX
ACK
DS1721 generates acknowledge bit
TX
RX
START
Bus Master initiates a repeated START condition
TX
RX
<address, 0>
Bus Master sends DS1721 address; R/
W
= 0
RX
TX
ACK
DS1721 generates acknowledge bit
TX
RX
AAh
Bus Master sends read temperature protocol
RX
TX
ACK
DS1721 generates acknowledge bit
TX
RX
START
Bus Master initiates a repeated START condition
TX
RX
<address, 1>
Bus Master sends DS1721 address; R/
W
=1
RX
TX
ACK
DS1721 generates acknowledge bit
RX
TX
<1 data byte>
DS1721 transmits MSB of temperature
TX
RX
ACK
Bus Master generates acknowledge bit
RX
TX
<1 data byte>
DS1721 transmits LSB of temperature