Rainbow Electronics DS1721 - 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 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 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 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