Datasheet

DHT20 Data Sheet
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Version:V1.0 —— May 2021
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6 Electrical Characteristics
6.1 Absolute Maximum Ratings
The electrical characteristics of DHT20 are defined in Table 2. The absolute maximum ratings given in Table 6 are
only stress ratings and provide more information. Under such condition, it is not advisable for the device to perform
functional operations. Exposure to absolute maximum ratings for a long time may affect the reliability of the sensor.
Parameters
Min
Max
Unit
VDD to GND
-0.3
5.5
V
Digital I/O Pins
(SDA, SCL) to GND
-0.3
VDD+0.3
V
Input current per pin
-10
10
mA
Table 6. Absolute maximum electrical ratings
ESD electrostatic discharge conforms to JEDECJESD22-A114 standard (human body model ±4kV),
JEDECJESD22-A115 (machine model ±200V). If the test condition exceeds the nominal limit index, the sensor
needs to add an additional protection circuit.
6.2 Input/Output Characteristics
Electrical characteristics, such as power consumption, input and output high and low voltages, etc., depend on the
power supply voltage. In order to make the sensor communication smooth, it is very important to ensure that the
signal design is strictly limited to the range given in Table 7, 8 and Figure 9).
Table 7. DC characteristics of digital input and output pads, if there is no special statement VDD=2.2 V to 5.5 V; T=-40°C to
80°C
Figure 9. Timing diagram of digital input / output
The abbreviations are explained in Table 8. The thicker SDA line is controlled by the sensor, and the ordinary SDA
line is controlled by the single-chip microcomputer. Please note that the SDA valid read time is triggered by the
falling edge of the previous conversion.
Parameters
Conditions
Min
Typical
Max
Unit
Low output Voltage VOL
VDD=3.3V,
-4mA<IOL<0mA
0
-
0.4
V
High output Voltage VOH
-
70% VDD
-
VDD
V
Output sink current IOL
-
-
-
-4
mA
Low output Voltage VIL
-
0
-
30%VDD
V
High output Voltage VIH
-
70% VDD
-
VDD
V
Input Current
VDD=5.5V,
VIN=0Vto5.5V
-
-
±1
uA