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
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.
- Alarm Systems
- Fibre Channel
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
DS1721 Reliability Data1/12/2023
Understanding Multidrop Address Assignments for Thermal Sensors3/28/2014
Thermal Management Handbook5/4/2010
Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices11/16/2006
Reverse Compatibility of the DS1721 Digital Temperature Sensor with the DS16215/31/2001
Tools & Simulations
DS1721 Companion Parts
Recommended Related Parts
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