DS1621

Digital Thermometer and Thermostat


Description

The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate the temperature of the device. The thermal alarm output, TOUT is active when the temperature of the device exceeds a user-defined temperature TH. The output remains active until the temperature drops below user defined temperature TL, allowing for any hysteresis necessary. User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to insertion in a system. Temperature settings and temperature readings are all communicated to/from the DS1621 over a simple 2-wire serial interface.
DS1621: Functional Block Diagram DS1621: Functional Block Diagram Enlarge+

Key Features

  • Temperature measurements require no external components
  • Measures temperatures from -55°C to +125°C in 0.5°C increments. Fahrenheit equivalent is -67°F to 257°F in 0.9°F increments
  • Temperature is read as a 9-bit value (2-byte transfer)
  • Wide power supply range (2.7V to 5.5V)
  • Converts temperature to digital word in less than 1 second
  • Thermostatic settings are user definable and nonvolatile
  • Data is read from/written via a 2-wire serial interface (open drain I/O lines)
  • Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermal sensitive system
  • 8-pin DIP or SO package (150mil and 208mil)

Applications/Uses

  • Medical
  • Networking
  • Personal Computing
  • Routers/Switches
  • Test Measurement Systems
  • Wireless Base Stations
Part Number Sensor Type Functions Interface Accuracy
(±°C)
Parasite Pwr. Temp. Thresh. Temp. Resolution
(bits)
Multi Droppable Oper. Temp.
(°C)
Budgetary
Price
See Notes
DS1621  Local Single Temperature Alarm 2-Wire/I2C/SMBus 0.5 No Programmable (NV)
9
10
11
12
Yes -55 to +125 $2.13 @1k
See All Temperature Sensors (111)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Tools & Models

DS1621 IBIS Model

 

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