DS18B20 Temperature Sensor Module
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 Maxim’s exclusive 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.
Another feature of this thermometer is the ability to operate without an external power supply. Power is instead supplied through the 1-Wire pullup resistor via the DQ pin when the bus is high.
The DS18B20 output temperature data is calibrated in degrees Celsius; for Fahrenheit applications, a lookup table or conversion routine must be used. The temperature data is stored as a 16-bit sign-extended two’s complement number in the temperature register.
Chip: Dallas DS18B20 T0-92
Input Voltage: 3V ~ 5.5V
Current: 1mA (Operational) , 759nA (Standby)
Output Type: Digital
Temperature Range: -55°C ~ +125°C
Accuracy: +/- 0.5°C (at -10°C ~ +85°C )
ADC: 9 bit , 12 bit (Selectable)
Interface: 1 Wire
Pin Number: 3 Pins
Size: 21mm x 10mm
Thermally Sensitive Systems