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.
Key Features
Applications/Uses
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 PR35 and 8-pin SO packages
Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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