The model " DS18B20 U+T&R" is a digital temperature sensor produced by Dallas Semiconductor, which is now a part of Maxim Integrated. The " DS18B20 U+T&R" is a widely used 1-wire digital temperature sensor with a unique 1-wire interface , commonly used for temperature measurement in various applications.
Pin Function and Specification of the DS18B20U+T&R
The DS18B20 is a 1-wire digital temperature sensor with 3 pins. The device itself has a 3-pin package (TO-92, for example), and the 3 pins are used as follows:
Pin Description: Pin Number Pin Name Function Description 1 GND Ground. Connect to the system ground. 2 DQ Data Input/Output (1-Wire Bus). This pin is used to send and receive data via the 1-wire Communication protocol. 3 VDD Power Supply (3V to 5.5V). Connect this pin to a power supply between 3V and 5.5V. Pin 1 (GND): This is the ground pin, used for establishing the reference ground for the sensor. Pin 2 (DQ): This is the data pin. The sensor communicates with other devices using the 1-wire protocol, and all data transmission occurs through this pin. Pin 3 (VDD): This is the power supply pin. The DS18B20 requires a voltage between 3.0V and 5.5V to operate. Ensure that the supply voltage is stable within this range for proper sensor operation.DS18B20 Pinout Summary (TO-92 Package):
Pin Name Function 1 GND Ground (0V) 2 DQ Data input/output (1-Wire Communication) 3 VDD Supply voltage (3V to 5.5V)Circuit Principle:
The DS18B20 is powered by a DC voltage (3V to 5.5V) and communicates with a microcontroller or other 1-wire devices via the data pin (DQ). The temperature sensor works by converting the ambient temperature into a digital output, which is transmitted using the 1-wire protocol over the DQ line.
Power-up: The DS18B20 is powered by VDD and GND pins. The VDD pin must be connected to a supply voltage between 3V and 5.5V. Data Transmission: The data transfer occurs over the 1-wire interface via the DQ pin. This pin acts as both an input and output for the communication. Temperature Measurement: The sensor internally measures the ambient temperature and converts it to a digital format. This data is then transmitted via the DQ line to the microcontroller or other device. 1-Wire Protocol: The DS18B20 uses the 1-wire communication protocol, which allows multiple sensors to be connected on the same bus using just one data line.DS18B20 FAQ (20 Common Questions):
1. What is the DS18B20?
The DS18B20 is a 1-wire digital temperature sensor designed for precise temperature measurement in the range of -55°C to +125°C.2. What is the 1-wire interface?
The 1-wire interface allows communication with the sensor using only one data line for both power and data transfer, simplifying wiring.3. What voltage range is supported by the DS18B20?
The DS18B20 can operate with a supply voltage between 3V and 5.5V.4. How accurate is the DS18B20?
The DS18B20 has a resolution of 9 to 12 bits, and its accuracy is ±0.5°C between -10°C and +85°C.5. Can multiple DS18B20 sensors be used together?
Yes, multiple DS18B20 sensors can be connected on the same 1-wire bus using the same data line.6. What is the response time of the DS18B20?
The DS18B20 typically requires about 750ms to convert the temperature to digital output.7. What is the resolution of the DS18B20 temperature measurement?
The DS18B20 can be configured to measure temperature with a resolution of 9, 10, 11, or 12 bits, where higher bits provide greater accuracy.8. Does the DS18B20 have a built-in EEPROM?
Yes, the DS18B20 has a small EEPROM that stores the unique 64-bit serial number for each device.9. How do I read the temperature from the DS18B20?
The DS18B20 sends the temperature data via the 1-wire protocol after a temperature conversion. You can read the data from the DQ pin using a microcontroller.10. What is the communication protocol for the DS18B20?
The DS18B20 uses the 1-wire protocol, where each sensor is identified by a unique 64-bit serial number.11. How can I configure the resolution of the DS18B20?
The resolution can be configured via software by writing to the sensor's configuration register.12. What is the maximum operating temperature of the DS18B20?
The DS18B20 operates within the temperature range of -55°C to +125°C.13. How does the DS18B20 achieve its temperature accuracy?
The DS18B20 achieves its accuracy through internal calibration and temperature-to-digital conversion with high precision.14. Can the DS18B20 be powered by a single wire?
Yes, the DS18B20 supports "parasite power mode," where it can be powered from the data line (DQ), eliminating the need for a separate power supply.15. What is the maximum data rate for communication with the DS18B20?
The maximum data rate for communication with the DS18B20 is 16.3k bits per second.16. Can I use the DS18B20 in a noisy environment?
The DS18B20 has built-in noise filtering to improve reliability in noisy environments.17. How do I handle errors in 1-wire communication?
If there is a communication error, the DS18B20 will not respond to the command. Error handling involves verifying the integrity of data and retrying the communication if needed.18. What is the power consumption of the DS18B20?
The DS18B20 consumes minimal power, typically around 1.5mA during conversion and much less when idle.19. What is the purpose of the DS18B20’s 64-bit unique ID?
The 64-bit unique ID ensures that each DS18B20 sensor is individually identifiable, even when multiple sensors are connected to the same bus.20. Can I use the DS18B20 with Arduino?
Yes, the DS18B20 is compatible with Arduino and can be easily interfaced using the OneWire library.Final Remarks:
The DS18B20 is a highly reliable and efficient temperature sensor that uses the 1-wire communication protocol. With a simple 3-pin connection and wide operating voltage range, it is perfect for a variety of temperature measurement applications.