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>

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>

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>

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