Econo Parasite-Power Digital Thermometer

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The DS1822-PAR is a digital thermometer with ±2°C accuracy over a -10°C to +85°C range and an operating temperature range of -55°C to +100°C. Data is read out over a 1-Wire® serial bus in 2's complement format with 9 to 12 bits of resolution (user-programmable).

The DS1822-PAR is a parasite-power only version of the DS1822 that is ideal for use in remote-sensing applications such as temperature probes. Parasite power eliminates the need for a local power supply since power is derived directly from the 1-Wire bus. The DS1822-PAR provides mechanical simplicity over the DS1822 for parasite-power applications because no VDD connection is required—the DS1822 must have VDD connected to ground for operation in parasite-power mode.

The DS1822-PAR offers thermostatic functionality with user-programmable over-temperature (TH) and under-temperature (TL) set points stored in on-chip EEPROM. Each DS1822-PAR features a unique and unchangeable 64-bit silicon serial number, which serves as the bus address for the sensor. This allows multiple DS1822-PAR devices to coexist on the same 1-Wire bus.

The DS1822-PAR is offered a 3-pin TO-92 package. Also available is the high-precision DS18B20-PAR, which provides ±0.5°C accuracy and is software-compatible with the DS1822-PAR.
DS1822-PAR: Block Diagram DS1822-PAR: Block Diagram Enlarge+

Key Features

  • Derives power from data line (parasite power)—does not need a local power supply
  • ±2°C accuracy from -10°C to +85°C
  • Measures temperatures from -55°C to +100°C (-67°F to +212°F)
  • 9- to 12-bit user-configurable resolution
  • 1-Wire interface requires only one port pin for communication
  • Multidrop capability for simplified distributed temperature sensing
  • 64-bit unique and unchangeable electronic serial number
  • Alarm function with user-defined nonvolatile alarm settings
  • Converts temperature to 12-bit digital word in 750ms (max)
  • No external components required to measure temperature
  • Ideal for remote sensing applications (e.g., temperature probes)
  • 3-pin TO-92 package


  • Remote Sensing Applications

See parametric specs for Temperature Sensors (113)

Part NumberSensor TypeInterfaceChannelsAccuracy
Parasite Pwr.Temp. Thresh.Temp. Resolution
Multi DroppableOper. Temp.
See Notes
DS1822-PAR Local1-WireOne2YesProgrammable (NV)
Yes-55 to +100
$2.06 @500

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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