DS18B20 Programmable Resolution 1-Wire Digital Thermometer
■The DS18B20 Digital Thermometer provides 9 to 12–bit centigrade temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of –55℃ to +125℃ and is accurate to ±0.5℃ over the range of –10℃ to +85℃. In addition, the DS18B20 can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply.
■Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1–wire bus; thus, it is simple to use one microprocessor to control many DS18B20s 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.
●FEATURES
■Unique 1-Wire® interface requires only one port pin for communication
■Each device has a unique 64-bit serial code stored in an onboard ROM
■Multidrop capability simplifies distributed temperature sensing applications
■Requires no external components
■Can be powered from data line. Power supply range is 3.0V to 5.5V
■Measures temperatures from –55℃ to +125℃ (–67°F to +257°F)
■±0.5℃ accuracy from –10℃ to +85℃
■Thermometer resolution is user-selectable from 9 to 12 bits
■Converts temperature to 12-bit digital word in 750ms (max.)
■User-definable nonvolatile (NV) alarm settings
■Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)
■Available in 8-pin SO (150mil), 8-pin μSOP, and 3-pin TO-92 packages
■Software compatible with the DS1822
■Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system
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DS18B20 、 DS18B20/T&R 、 DS18B20+ 、 DS18B20+T&R 、 DS18B20U 、 DS18B20U/T&R 、 DS18B20U+ 、 DS18B20U+T&R 、 DS18B20Z 、 DS18B20Z/T&R 、 DS18B20Z+ 、 DS18B20Z+T&R 、 DS18B20X 、 DS18B20s |
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Programmable Resolution 1-Wire Digital Thermometer 、 Digital Thermometer |
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[ HVAC environmental controls ][ temperature monitoring systems ][ buildings ][ machinery ][ process monitoring and control systems ] |
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Datasheet |
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Please see the document for details |
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TO-92;μSOP;SO |
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English Chinese Chinese and English Japanese |
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2005/6/14 |
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050102 |
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292 KB |
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