DS1721S Product Details
The DS1721S 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 DS1721S features three address inputs, allowing users to multidrop up to eight DS1721S devices on one bus. The DS1721S 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 DS1721S 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.
Feature
- ±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
- Alarm Systems
- Fibre Channel
- Instrumentation
- Networking
(Picture: Diagram)
