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DS1820

Dallas
Part Number DS1820
Manufacturer Dallas
Description 1-Wire Digital Thermometer
Published Aug 17, 2005
Detailed Description DS1820 DS1820 1–WireTM Digital Thermometer FEATURES PIN ASSIGNMENT DALLAS DALLAS DS2434 DS1820 1 2 3 • Unique 1–Wir...
Datasheet PDF File DS1820 PDF File

DS1820
DS1820

Overview
DS1820 DS1820 1–WireTM Digital Thermometer 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 alarm set- DS1820 PR35 PACKAGE See Mech.
Drawings Section GND DQ VDD NC NC NC NC NC NC VDD DQ 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 NC NC NC NC NC NC NC GND DS1820S 16–PIN SSOP See Mech.
Drawings Section • Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition) systems, consumer products, thermometers, or any thermally sensitive system PIN DESCRIPTION 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 connected from a central microprocessor to a DS1820.
Power for reading, writing, and performing temperature conversions can be derived from the data line itself with no need for an external power source.
Because each DS1820 contains a unique silicon serial number, multiple DS1820s can exist on the same 1–Wire bus.
This allows for placing temperature sensors in many different places.
Applications where this feature is useful include HVAC environmental controls, sensing temperatures inside buildings, equipment or machinery, and in process...


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