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Digital Thermometer and Thermostat

Product Details

Key Features

Parametric specs for Temperature Sensors
Sensor Type Local
# Channels One
Interface 2-Wire/I2C/SMBus
Accuracy (±°C) 1
Parasite Pwr. No
Temp. Thresh. Programmable
Temp. Resolution (bits) 9
10
11
12
Oper. Temp. (°C) -55 to +125
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
2
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Simplified Block Diagram

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Parameters

Parametric specs for Temperature Sensors
Sensor Type Local
# Channels One
Interface 2-Wire/I2C/SMBus
Accuracy (±°C) 1
Parasite Pwr. No
Temp. Thresh. Programmable
Temp. Resolution (bits) 9
10
11
12
Oper. Temp. (°C) -55 to +125
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
2

Key Features

  • ±1°C accuracy from -10°C to +85°C
  • Measures temperatures from -55°C to +125°C (-67°F to +257°F)
  • 9- to 12-bit user-configurable resolution
  • Dedicated thermostatic logic output
  • Thermostatic settings are user-programmable
  • Data is transferred over 2-wire/SMBus interface
  • Three address inputs allow up to eight DS1721 to operate on one bus
  • 2.7V to 5.5V supply range
  • 150mil 8-pin SO (DS1721S) and 8-pin µMAX/µSOP (DS1721U) packages

Applications/Uses

  • Alarm Systems
  • Fibre Channel
  • Instrumentation
  • Networking

Description

The DS1721 digital thermometer and thermostat features ±1°C accuracy over a -10°C to +85°C range. Thermometer data is read out over a 2-wire serial bus in 2's complement format with 9 to 12 bits of resolution (user-programmable). The DS1721 features three address inputs, allowing users to multidrop up to eight DS1721 devices on one bus.

The DS1721 offers thermostatic functionality with over-temperature (TH) and under-temperature (TL) user-programmable trip-points stored in on-chip SRAM. The two trip-points provide programmable thermostat hysteresis: the thermostat output is asserted when the measured temperature exceeds TH and it remains active until the temperature falls below TL.

The DS1721 is available in 150mil 8-pin SO (DS1721S) and 8-pin µMAX/µSOP (DS1721U) packages. For applications requiring higher precision, the DS1631 provides ±0.5°C accuracy and is functionally compatible with the DS1721.

Simplified Block Diagram

DS1721: Functional Block Diagram DS1721: Functional Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .