(Hong Kong)
Product Summary
The DS1821S is a thermometer. It provides 9- to 12-bit centigrade temperature measurements and has an alarm function with NV user-programmable upper and lower trigger points. The DS1821S 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 ±2.0℃ over the range of –10℃ to +85℃. In addition, the DS1821S can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply.
Parametrics
DS1821S absolute maximum ratings: (1)Voltage on Any Pin Relative to Ground: -0.5V to +6.0V; (2)Operating Temperature Range: -55℃ to +125℃; (3)Storage Temperature Range: -55℃ to +125℃; (4)Solder Dip Temperature: See IPC/JEDEC J-STD-020A Specification; (5)Reflow Oven Temperature: +220℃.
Features
DS1821S features: (1)Unique 1-Wire?interface requires only one port pin for communication; (2)Each device has a unique 64-bit serial code stored in an on-board ROM; (3)Multidrop capability simplifies distributed temperature-sensing applications; (4)Requires no external components; (5)Can be powered from data line. Power supply range is 3.0V to 5.5V; (6)Measures temperatures from -55℃ to +125℃ (-67℃ to +257℃); (7)±2.0℃ accuracy from -10℃ to +85℃; (8)Thermometer resolution is user-selectable from 9 to 12 bits; (9) Converts temperature to 12-bit digital word in 750ms (max.); (10) User-definable nonvolatile (NV) alarm settings; (11) Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition); (12) Software compatible with the DS18B20; (13) Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system.
Diagrams
| Image | Part No | Mfg | Description |  |
Pricing (USD) |
Quantity | ||||||||||||
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 DS1821S |
Maxim Integrated Products |
Board Mount Temperature Sensors |
Data Sheet |
Negotiable |
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DS1821S+T&R |
Maxim Integrated Products |
Board Mount Temperature Sensors Programmable Digital Thermostat/Thrmmtr |
Data Sheet |
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DS1821S+ |
Maxim Integrated Products |
Board Mount Temperature Sensors Programmable Digital Thermostat/Thrmmtr |
Data Sheet |
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DS1821S/T&R |
Maxim Integrated Products |
Board Mount Temperature Sensors |
Data Sheet |
Negotiable |
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