DS1820 - Dallas

DS1820 1-Wire Digital Thermometer

GND DQ VDD NC – – – – Ground Data In/Out Optional VDD No Connect • Applications include thermostatic controls, industrial DESCRIPTION The DS1820 Digital Thermometer provides 9–bit temperature readings which indicate the temperature of the device. Information is sent to/from the DS1820 over a 1–Wire interface, so that only one wire (and ground) needs to be .

Features

PIN ASSIGNMENT DALLAS DALLAS DS2434 DS1820 1 2 3
• Unique 1
  –WireTM interface requires only one port pin for communication
• Multidrop capability simplifies distributed temperature sensing applications
• Requires no external components
• Can be powered from data line
• Zero standby power required
• Measures temperatures from
  –55°C to +125°C in 0.5°C increments. Fahrenheit equivalent is
  –67°F to +257°F in 0.9°F increments BOTTOM VIEW 1 2 3
• Temperature is read as a 9
  –bit digital value.
• Converts temperature to digital word in 200 ms (typ.)
• User
  –definable, tings nonvolatile temperature.