Features and Benefits

  • 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

Product Details

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.


  • Remote Sensing Applications

Product Lifecycle icon-recommended 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.

Product Recommendations

DS1822-PAR Companion Parts

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