DS1721U Maxim Integrated Products, DS1721U Datasheet - Page 11

• Manufacturer Part Number: DS1721U
• Description: IC THERMOMETER/STAT DIG HP 8USOP
• Manufacturer: Maxim Integrated Products

Specifications of DS1721U

• 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-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• 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

Stop Convert T [22h]
This command stops temperature conversion. No further data is required. This command may be used to
halt a DS1721 in continuous conversion mode. After issuing this command, the current temperature
measurement will be completed, stored and the DS1721 will remain idle until a Start Convert T is issued
to resume conversions.
DS1721 COMMAND SET Table 4
NOTES:
1. Data direction depends upon R/
2. In continuous conversion mode, a Stop Convert T command will halt continuous conversion. To
3. If the user only desires 8-bit thermometer readings, the master need only read 1 data byte and follow
Access
Configuration
Access TH
Access TL
Start Convert T
Stop Convert T
Read
Temperature
INSTRUCTION
restart, the Start Convert T command must be issued. In one-shot mode, a Start Convert T command
must be issued for every temperature reading desired.
with a NACK and STOP. If higher resolution is required, 2 bytes must be read.
Writes to/Reads from 8-bit
configuration/status register
Writes to/Reads from
12-bit TH register
Writes to/Reads from
12-bit TL register
Initiates temperature
conversion
Terminates continuous
conversions
Reads 12-bit
Temperature register
DESCRIPTION
W
CONVERSION COMMANDS
bit in the 2-wire control byte.
REGISTER COMMANDS
11 of 17
PROTOCOL
AAh
ACh
A1h
A2h
51h
22h
2-WIRE BUS DATA
Read 1 or 2 data bytes
AFTER ISSUING
1 or 2 data bytes
1 or 2 data bytes
PROTOCOL
1 data byte
idle
idle
NOTES
1, 3
1, 3
1
2
2
3