1线制数字温度传感器DS18B20- 测试范围-10 +85摄氏度

1线制数字温度传感器DS18B20- 测试范围-10~+85摄氏度

General Description 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. Applications ● Thermostatic Controls ● Industrial Systems ● Consumer Products ● Thermometers ● Thermally Sensitive Systems Benefits and Features ● Unique 1-Wire® Interface Requires Only One Port Pin for Communication ● Reduce Component Count with Integrated Temperature Sensor and EEPROM • Measures Temperatures from -55°C to +125°C (-67°F to +257°F) • ±0.5°C Accuracy from -10°C to +85°C • 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 Programmed Limits ● Available in 8-Pin SO (150 mils), 8-Pin µSOP, and 3-Pin TO-92 Packages