Features
1. High precision, low power consumption, strong stability and small size
2. Data output: IIC communication protocol, long communication distance, high efficiency and stability
3. Using ABS material, its impact resistance, heat resistance, low temperature resistance, chemical resistance and electrical performance are excellent, product size is stable, and surface gloss is good.
Temperature and humidity sensor
Fully calibrated
Digital output, I°C interface
Excellent long-term stability
Quick response and strong anti-interference ability
Wide voltage support 2.2-5.5VDC
Serial Data (SDA)
The SDA pin is used for sensor data input and output. When sending commands to the sensor, SDA is active on the rising edge of the serial clock (SCL) and must remain stable while SCL is high. After the falling edge of SCL, the SDA value can be changed. To ensure communication security, the valid time of SDA should be extended to TSU and THO respectively before the rising edge of SCL and after the falling edge of SCL. When reading data from the sensor, SDA is active (TV) after SCL goes low and remains until the next falling edge of SCL.
Typical application circuit, including RC circuit between VDD and GND.
Note:
1. When the product is used in the circuit, the power supply voltage of the host MCU must be consistent with the sensor;
2. To further improve the reliability of the system, the sensor power supply can be controlled.
3. Only a single DHT20 can be connected to the 12C bus, and other |PC devices cannot be connected.
4. The power supply voltage range of the host MCU to the DHT20 is 2.5~5.5V.
5. When the sensor is just powered on, the MCU first supplies power to VCC, and SCL and SDA can be set to high levels after 5ms.
