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DS1820 Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS1820 Datasheet(HTML) 1 Page - Dallas Semiconductor |
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1 / 27 page  DS1820 1–WireTM Digital Thermometer DS1820 030598 1/27 FEATURES • Unique 1–WireTM interface requires only one port pin for communication • Multidropcapabilitysimplifiesdistributedtemperature 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 • Temperature is read as a 9–bit digital value. • Converts temperature to digital word in 200 ms (typ.) • User–definable, nonvolatile temperature alarm set- tings • Alarm search command identifies and addresses devices whose temperature is outside of pro- grammed limits (temperature alarm condition) • Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system PIN ASSIGNMENT 3 2 1 DALLAS DS2434 DALLAS DS1820 3 2 1 DS1820S 16–PIN SSOP DS1820 PR35 PACKAGE 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 NC NC NC NC NC NC NC GND NC NC NC NC NC NC VDD DQ BOTTOM VIEW See Mech. Drawings Section See Mech. Drawings Section PIN DESCRIPTION GND – Ground DQ – Data In/Out VDD – Optional VDD NC – No Connect DESCRIPTION The DS1820 Digital Thermometer provides 9–bit tem- perature 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 sen- sors in many different places. Applications where this feature is useful include HVAC environmental controls, sensing temperatures inside buildings, equipment or machinery, and in process monitoring and control. |
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