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Product Summary
DHT20 is a new upgraded product of DHT11, equipped with a dedicated ASIC sensor chip, a
high-performance semiconductor silicon-based capacitive humidity sensor and a standard on-
chip temperature sensor, and uses a standard I
2
C data output signal format. Its performance has
been greatly improved and has exceeded the reliability level of the previous generation
sensor(DHT11).The new generation of upgraded products have been improved to make their
performance more stable in high temperature and high humidity environments; at the same time,
the accuracy, response time, and measurement range of the product have been greatly improved.
Each sensor is rigorously calibrated and tested before leaving the factory to ensure and satisfy
customer’s large-scale applications.
Data Sheet DHT20
Humidity and Temperature Module
• Relative humidity and temperature output
• Superior sensor performance, typical accuracy RH: ±3%, T: ±0.5℃
• Fully calibrated and processed digital output, I²C protocol
• Wide voltage support 2.2 to 5.5V DC
• Excellent long-term stability
• Fast-response and anti-interference capability
1 Product Description
The DHT20 is a kind of sensor of humidity and temperature with digital I²C output. It can be
applied to HVAC, dehumidifier, testing and inspection equipment, consumer products,
automobiles, automatic control, data loggers, weather stations, home appliances, humidity control,
medical and other application fields which need to detect and control temperature and humidity.
Figure 1. DHT20
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Version:V1.0 —— May 2021
DHT20 Data Sheet
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2 Sensor Specifications
Relative Humidity
Parameter
Condition
Typical
Value
Max
Unit
Resolution
Typical
0.024
-
%RH
Accuracy
Typical
±3
-
%RH
Tolerance
1
Max
See Figure 2
-
%RH
Repeatable
-
±0.1
-
%RH
Hysteresis
-
±1
-
%RH
Nonlinear
-
<0.1
-
%RH
Response Time
2
63%
<8
-
s
Scope of Work
Extended
3
-
100
%RH
Prolonged Drift
4
Normal
<0.5
-
%RH/yr
Table 1. Humidity characteristics table
Figure 2. Typical and maximum humidity errors
Electrical Specifications
Parameter
Condition
Min
Typical Value
Max
Unit
Supply Voltage
Typical
2.2
3.3
5.5
V
Supply Current,
IDD
5
Dormancy
-
250
-
nA
Measure
-
980
-
µA
Power
Consumption
6
Dormancy
-
-
0.8
µW
Measure
-
3.2
-
mW
Communication
Standard I²C protocol
Table 2. Electrical Specifications