DS1822-PAR

Output Type : Digital
Configuration : Local
Device Function : Sensor
Accuracy : +/- 3 C
Supply Voltage - Min : 3 V
Supply Voltage - Max : 5.5 V
Minimum Operating Temperature : - 55 C
Shutdown : No
Temperature Threshold : None
Mounting Style : Through Hole
Package / Case : TO-92-3
Maximum Operating Temperature : + 100 C
Digital Output - Bus Interface : 1-Wire


Features:

• Unique 1-wire interface requires only one port pin for communication
• Derives power from data line ("parasite power")-does not need a local power supply
• Multi-drop capability simplifies distributed temperature sensing applications
• Requires no external components
• ±2.0°C accuracy from 10°C to +85°C
• Measures temperatures from 55°C to +100°C (67°F to +212°F)
• Thermometer resolution is user-selectable from 9 to 12 bits
• Converts temperature to 12-bit digital word in 750 ms (max.)
• Userdefinable temperature alarm settings
• Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)
• Software compatible with the DS18B20-PAR
• Ideal for use in remote sensing applications (e.g., temperature probes) that do not have a local power source

Specifications

Voltage on any pin relative to ground ..................0.5V to +6.0V
Operating temperature ....................................55°C to +100°C
Storage temperature .......................................55°C to +125°C
Soldering temperature ...................See J-STD-020A Specification

*These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

Description

The DS1822-PAR digital thermometer provides 9 to 12bit centigrade temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS1822-PAR does not need an external power supply because it derives power directly from the data line ("parasite power"). The DS1822-PAR communicates over a 1-wire bus, which by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of 55°C to +100°C and is accurate to ±2.0°C over a range of 10°C to +85°C.

Each DS1822-PAR has a unique 64-bit identification code, which allows multiple DS1822-PARs to function on the same 1wire bus; thus, it is simple to use one microprocessor to control many DS1822-PARs distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment or machinery, and process monitoring and control systems.