DS1721S/T&R Maxim Integrated Products, DS1721S/T&R Datasheet - Page 12

• Manufacturer Part Number: DS1721S/T&R
• Description: IC THERMOMETER/STAT DIG HP 8SOIC
• Manufacturer: Maxim Integrated Products

Specifications of DS1721S/T&R

• Function: Thermometer, Thermostat
• Topology: ADC, Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Full Temp Accuracy: +/- 2 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 12 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SAMPLE COMMAND SEQUENCE Table 5
Example: After power-up, initiates a temperature conversion, bus master reads temperature
BUS MASTER
MODE
RX
RX
RX
RX
RX
RX
RX
TX
TX
TX
TX
TX
TX
TX
TX
TX
DS1721
MODE
RX
RX
RX
RX
RX
RX
RX
RX
RX
TX
TX
TX
TX
TX
TX
TX
DATA (MSB
<1 data byte>
<1 data byte>
<address, 0>
<address, 0>
<address, 1>
FIRST)
START
START
START
ACK
ACK
ACK
ACK
ACK
ACK
AAh
51h
12 of 17
COMMENTS
Bus Master initiates a START condition
Bus Master sends DS1721 address; R/
DS1721 generates acknowledge bit
Bus Master sends start convert T protocol
DS1721 generates acknowledge bit
Bus Master initiates a repeated START condition
Bus Master sends DS1721 address; R/
DS1721 generates acknowledge bit
Bus Master sends read temperature protocol
DS1721 generates acknowledge bit
Bus Master initiates a repeated START condition
Bus Master sends DS1721 address; R/
DS1721 generates acknowledge bit
DS1721 transmits MSB of temperature
Bus Master generates acknowledge bit
DS1721 transmits LSB of temperature
W
W
W
= 0
= 0
=1