Rainbow-electronics DS1721 Uživatelský manuál stáhnout pdf (Strana 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

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