DALLAS DS1822-PAR

the ds1822-par is a digital thermometer with 2c accuracy over a -10c to 85c range and an operating temperature range of -55c to 100c. data is read out over a 1-wire serial bus in 2s 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 requiredthe 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 0.5c accuracy and is software-compatible with the ds1822-par.