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Version:V1.0 —— May 2021

AHT20 Data Sheet

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6 Electrical Characteristics

6.1 Absolute Maximum Ratings

The electric specifications of sensor are defined in Table 2.The absolute maximum ratings given in Table 6 are

only stress ratings and to provide more information. Under such conditions, it is not advisable for the device to

perform functional operation. Exposure to absolute maximum rating or 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

VCC+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=2.2V to 5.5VT=-40°C to 85°C

Figure 17. Timing diagram of digital input/output

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=0V to 5.5V

-

-

±1

uA