Temperature and humidity module
AM2301 Product Manual
www.aosong.com
Pin
Color
Name
Description
1
Red
VDD
Power (3.3V-5.2V)
2
Yellow
SDA
Serial data，Dual-port
3
Black
GND
Ground
4 NC
Empty
1、Product Overview
AM2301 capacitive humidity sensing digital temperature and humidity module is the one that contains the
compound has been calibrated digital signal output of the temperature and humidity sensor. Application of a
dedicated digital modules collection technology and the temperature and humidity sensing technology, to ensure
that the product has high reliability and excellent long-term stability. The sensor includes a capacitive sensor wet
components and a high-precision temperature measurement devices, and connected with a high-performance
8-bit microcontroller. The product has excellent quality, fast response, strong anti-jamming capability, and
high cost. Each sensor is extremely accurate humidity calibration chamber calibration. The form of procedures,
the calibration coefficients stored in the microcontroller, the sensor within the processing of the heartbeat to call
these calibration coefficients. Standard single-bus interface, system integration quick and easy. Small size, low
power consumption, signal transmission distance up to 20 meters, making it the best choice of all kinds of
applications and even the most demanding applications. Products for the 3-lead (single-bus interface)
connection convenience. Special packages according to user needs.
Physical map Dimensions (unit: mm)
2、Applications
HVAC, dehumidifier, testing and inspection equipment, consumer goods, automotive, automatic control, data
loggers, home appliances, humidity regulator, medical, weather stations, and other humidity measurement and
control and so on.
3、Features
Ultra-low power, the transmission distance, fully automated calibration, the use of capacitive humidity sensor,
completely interchangeable, standard digital single-bus output, excellent long-term stability, high accuracy
temperature measurement devices.
4、The definition of single-bus interface
4.1 AM2301 Pin assignments
Table 1： AM2301 Pin assignments
PIC1： AM2301 Pin Assignment
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Parameter
Condition
min
typ
max
Unit
Resolution
0.1 %RH
Range
0
99.9
%RH
Accuracy
[1]
25℃
±3 %RH
Repeatability
±1 %RH
Exchange
Completely interchangeable
Response
[2]
1/e(63%)
<6 S
Sluggish
±0.3 %RH
Drift
[3]
Typical
<0.5
%RH/yr
5.2 Temperature
Table 3： AM2301 Relative temperature performance
Parameter
Condition
min
typ
max
Unit
Resolutio
n
0.1 ℃
16 bit
Accuracy
±0.3
±1 ℃ Range
-40 80 ℃ Repeat
±0.2 ℃
Exchange
Completely interchangeable
Response
1/e(63%)
<10 S
Drift
±0.3
℃/yr
4.2 Power supply pins（VDD GND）
AM2301 supply voltage range 3.3V - 5.2V, recommended supply voltage is 5V.
4.3 Serial data（SDA）
SDA pin is tri structure for reading, writing sensor data. Specific communication timing, see the detailed
description of the communication protocol.
5、Sensor performance
5.1 Relative humidity
Table 2： AM2301 Relative humidity performance table
Pic2: At25℃ The error of relative humidity Pic3：The maximum temperature error
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 AM2301, 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.
Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com
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Parameter
Condition
min
typ
max
Unit
Voltage
3.3 5 5.2
V
Power
consumption
[4]
Dormancy
10
15 µA
Measuring
500 µA
Average
300 µA
Low level output
voltage
I
OL
[5]
0
300
mV
High output
voltage
Rp<25 kΩ
90%
100%
VDD
Low input voltage
Decline
0 30%
VDD
Input High
Voltage
Rise
70%
100%
VDD
Rpu
[6]
VDD = 5V
VIN = VSS
30
45
60
kΩ
Output current
turn on
8
mA
turn off
10
20 µA
Sampling period
2 S
[1] the accuracy of the factory inspection, the sensor
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.
Table 4： AM2301 DC Characteristics
7、Single-bus communication（ONE-WIRE）
7.1 Typical circuits for single bus
Microprocessor and AM2301 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
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.
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
Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com
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