Aosong Electronics Co.,Ltd

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Your specialist in innovating humidity & temperature sensors

1. Feature & Application:

* Full range temperature compensated

* Relative humidity and temperature measurement

* Calibrated digital signal

*Outstanding long-term stability *Extra components not needed

* Long transmission distance * Low power consumption

*4 pins packaged and fully interchangeable

2. Description:

DHT22 output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humidity

sensing technology, assuring its reliability and stability.Its sensing elements is connected with 8-bit single-chip

computer.

Every sensor of this model is temperature compensated and calibrated in accurate calibration chamber and the

calibration-coefficient is saved in type of programme in OTP memory, when the sensor is detecting, it will cite

coefficient from memory.

Small size & low consumption & long transmission distance(20m) enable DHT22 to be suited in all kinds of

harsh application occasions.

Single-row packaged with four pins, making the connection very convenient.

3. Technical Specification:

Model

DHT22

Power supply

3.3-6V DC

Output signal

digital signal via single-bus

Sensing element

Polymer capacitor

Operating range

humidity 0-100%RH;

temperature -40~80Celsius

Accuracy

humidity +-2%RH(Max +-5%RH); temperature <+-0.5Celsius

Resolution or sensitivity humidity 0.1%RH;

temperature 0.1Celsius

Repeatability

humidity +-1%RH;

temperature +-0.2Celsius

Humidity hysteresis

+-0.3%RH

Long-term Stability

+-0.5%RH/year

Sensing period

Average: 2s

Interchangeability

fully interchangeable

Dimensions

small size 14*18*5.5mm;

big size 22*28*5mm

4. Dimensions: (unit----mm)

1) Small size dimensions: (unit----mm)

Thomas Liu (Business Manager)

Email: thomasliu198518@yahoo.com.cn

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