DS18B20U+

DS18B20 is a digital thermometer. It provides 9-bit to 12bit Celsius temperature measurements and has an alarm function with non-volatile user-programmable upper and lower trigger points. It communicates over a 1-wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. In addition, this device can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply. It has a unique 64-bit serial code, which allows multiple devices to function on the same 1-wire bus. Thus, it is simple to use one microprocessor to control many devices 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, thermostatic controls, industrial systems, consumer products, thermometers, thermally sensitive systems.

• Unique 1-Wire® interface requires only one port pin for communication
• Reduce component count with integrated temperature sensor and EEPROM
• ±0.5°C accuracy from -10°C to +85°C
• Programmable resolution from 9bits to 12bits, no external components required
• Parasitic power mode requires only 2 pins for operation (DQ and GND)
• Simplifies distributed temperature-sensing applications with multidrop capability
• Supply voltage range from +3V to +5.5V
• Drift is ±0.2°C typical at (55°C to +125°C; VDD = 3V to 5.5V)
• Active current is 1mA typical at (VDD = 5V)
• Operating temperature is -55°C to +125°C, package style is 8-pin FSOP

Notes

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