DS1821
Programmable Digital Thermostat and Thermometer
Overview
- Requires no external components
- Unique 1-Wire interface requires only one port pin for communication
- Operates over a -55°C to +125°C (-67°F to +257°F) temperature range
- Functions as a standalone thermostat with user-definable trip-points
- Provides 8-bit (1°C resolution) centigrade temperature measurements
- Accuracy is ±1°C over 0°C to +85°C range
- Converts temperature to a digital word in 1 second (max)
- Available in 3-pin TO92 and 8-pin SO packages
- Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system
The DS1821 can function as a standalone thermostat with user-programmable trip-points or as 8-bit temperature sensor with a 1-Wire® digital interface. The thermostat trip-points are stored in nonvolatile memory, so DS1821 units can be programmed prior to system insertion for true standalone operation. The DS1821 has an operating temperature range of –55°C to +125°C and is accurate to ±1°C over a range of 0°C to +85°C. Communication with the DS1821 is accomplished through the open-drain DQ pin; this pin also serves as the thermostat output.
Applications
- Consumer Products
- Industrial Systems
- Thermometers
- Thermostatic Controls
Documentation
Data Sheet 1
Reliability Data 1
Technical Articles 3
This is the most up-to-date revision of the Data Sheet.