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DS1721: Digital Thermometer and Thermostat Data Sheet (Rev. 3)11/7/2005PDF257K
Overview
Features and Benefits
- ±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
Product Details
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.
Applications
- Alarm Systems
- Fibre Channel
- Instrumentation
- Networking
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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DS1721 Reliability Data1/12/2023PDF20K
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Understanding Multidrop Address Assignments for Thermal Sensors3/28/2014
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Thermal Management Handbook5/4/2010
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Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices11/16/2006
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Reverse Compatibility of the DS1721 Digital Temperature Sensor with the DS16215/31/2001
Tools & Simulations
IBIS Models
IBS
DS1721 IBIS Model
58.79K
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
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DS1721 Discussions
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