MAXIM DS18B20U+T&R

The DS18B20 digital thermometer provides 9- bit to 12- bit Celsius 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. 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.

• Unique 1- Wire Interface Requires Only One Port Pin for Communication
• Reduce Component Count with Integrated Temperature Sensor and EEPROM
• Measures Temperatures from -55℃ to +125℃ (-67°F to +257°F)
• ±0.5℃ Accuracy from -10℃ to +85℃
• Programmable Resolution from 9 Bits to 12 Bits
• No External Components Required
• Parasitic Power Mode Requires Only 2 Pins for Operation (DQ and GND)
• Simplifies Distributed Temperature- Sensing Applications with Multidrop Capability
• Each Device Has a Unique 64- Bit Serial Code Stored in On- Board ROM
• Flexible User- Definable Nonvolatile (NV) Alarm Settings with Alarm Search Command
• Identifies Devices with Temperatures Outside Programed Limits
• Available in 8- Pin SO (150 mils), 8- Pin sSOP, and 3- Pin TO- 92 Packages

• Thermostatic Controls
• Industrial Systems
• Consumer Products
• Thermometers
• Thermally Sensitive Systems