AM2302 Ver la hoja de datos (PDF) - Unspecified

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AM2302

Temperature and humidity module

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6、Electrical Characteristics

Electrical characteristics, such as energy consumption, high, low, input, output voltage, depending on the

power supply. Table 4 details the electrical characteristics of the AM2302, if not identified, said supply voltage of

5V. To get the best results with the sensor, please design strictly in accordance with the conditions of design in

Table 4.

Table 4： AM2302 DC Characteristics

Parameter Condition min typ max Unit

Voltage

3.3

5

5.5

V

[1] the accuracy of the factory inspection, the sensor

Dormancy

10

Power

Measuring

consumption [4]

Average

Low level output

voltage

I [5]

OL

0

High output

voltage

Rp<25 kΩ 90%

Low input voltage Decline

0

Input High

Voltage

Rise

70%

Rpu[6]

VDD = 5V

30

VIN = VSS

turn on

Output current

turn off

10

15

µA

500

µA

300

µA

300

mV

100%

30%

100%

VDD

VDD

VDD

45

60

kΩ

8

mA

20

µA

25°C and 5V, the accuracy specification of test

conditions, it does not include hysteresis and

nonlinearity, and is only suitable for non-condensing

environment.

[2] to achieve an order of 63% of the time required

under the conditions of 25℃ and 1m / s airflow.

[3] in the volatile organic compounds, the values may

be higher. See the manual application to store

information.

[4] this value at VDD = 5.0V when the temperature

is 25℃, 2S / time, under the conditions of the

average.

[5] low output current.

[6] that the pull-up resistor.

Sampling period

2

S

7、Single-bus communication（ONE-WIRE）

7.1 Typical circuits for single bus

Microprocessor and AM2302 connection typical application circuit is shown in Figure 4. Single bus

communication mode, pull the SDA microprocessor I / O port is connected.

Special instructions of the single-bus communication：

1．Typical application circuit recommended in the short cable length of 30 meters on the 5.1K

pull-up resistor pullup resistor according to the actual situation of lower than 30 m.

2．With 3.3V supply voltage, cable length shall not be greater than 100cm. Otherwise, the line

voltage drop will lead to the sensor power supply, resulting in measurement error.

3．Read the sensor minimum time interval for the 2S; read interval is less than 2S, may cause the

temperature and humidity are not allowed or communication is unsuccessful, etc..

4．Temperature and humidity values are each read out the results of the last measurement For

real-time data that need continuous read twice, we recommend repeatedly to read sensors, and each read

sensor interval is greater than 2 seconds to obtain accuratethe data.

Aosong(Guangzhou) Electronics Co.,Ltd.

TEL：020-36042809 / 36380552

-3-

www.aosong.com

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