Interfacing DS1820 Temperature Sensor

Dallas DS1820 is a digital temperatur sensor chip. The output of sensor is already in digital form. Dallas 1-Wire protocol is used to communicate between DS1820 and microcontroller. 1-Wire protocol is simple, can be implement to common microcontroller with C or Assembly codes.

Dallas DS1820 Interfacing Circuit

Dallas DS1820 offers:

• Measures temperatures from -55°C to +125°C (-67°F to +257°F). ±0.5°C accuracy from -10°C to +85°C. 9-bit temperature measurements.
• Use 1-Wire®, requires only 1 bidirectional data pin of microprocessor.
• Convertion time: 750ms (max.).
• Each device has a unique 64-bit, stored in an onboard ROM.
• Multiple devices, multidrop capability.
• Has alarm function. Upper and lower trigger points stored in nonvolatile memory.
• Requires no external components.
• Can be powered from data line.

Interesting links of Dallas DS1820:

• 1-Wire Parasite-Power Digital Thermometer
  http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2815/ln/en
• Interfacing the DS18X20/DS1822 1-Wire Temperature Sensor in a Microcontroller Environment
  http://www.maxim-ic.com/appnotes.cfm/appnote_number/162
• 1-Wire Communication with a Microchip PICmicro Microcontroller
  http://www.maxim-ic.com/appnotes.cfm/appnote_number/2420
• Interfacing DS1820 to AT89S52 using Keil C51
  http://www.sixca.com/micro/mcs51/ds1820_51/index.html
• Interfacing DS1820 to Atmel AVR AT90S1200
  http://www.embedtronics.com/demotemp/demotemp.html
• Interfacing Dallas DS1820 to Atmel AVR ATMega16
  http://www.e-dsp.com/how-to-measure-temperature-with-the-dallas-maxim-ds1820-sensor/
• Interfacing Dallas DS1820 to PC (Linux)
  http://www.digitemp.com/
• Interfacing Dallas DS1820 to PC (Windows and Linux)
  http://www.maltepoeggel.de/html/ds1820/