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AM2302 데이터시트 PDF




ETC에서 제조한 전자 부품 AM2302은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 AM2302 기능
기능 Digital relative humidity & temperature emperature sensor
제조업체 ETC
로고 ETC 로고


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AM2302 데이터시트, 핀배열, 회로
Your specialist in innovating humidity & temperature sensors
Standard AM2302/DHT22
AM2302/DHT22 with big case and wires
Digital relative humidity & temperature sensor AM2302/DHT22
1. Feature & Application:
*High precision
*Capacitive type
*Full range temperature compensated
*Relative humidity and temperature measurement
*Calibrated digital signal
*Outstanding long-term stability
*Extra components not needed
*Long transmission distance, up to 100 meters
*Low power consumption
*4 pins packaged and fully interchangeable
2. Description:
AM2302 output calibrated digital signal. It applys exclusive digital-signal-collecting-technique and humidity
sensing technology, assuring its reliability and stability. Its sensing elements is connected with 8-bit single-chip
computer.
Every sensor of this model is temperature compensated and calibrated in accurate calibration chamber and the
calibration-coefficient is saved in type of programme in OTP memory, when the sensor is detecting, it will cite
coefficient from memory.
Small size & low consumption & long transmission distance(100m) enable AM2302 to be suited in all kinds of
harsh application occasions. Single-row packaged with four pins, making the connection very convenient.
3. Technical Specification:
Model
Power supply
Output signal
Sensing element
Operating range
Accuracy
Resolution or sensitivity
Repeatability
Humidity hysteresis
Long-term Stability
Interchangeability
AM2302
3.3-5.5V DC
digital signal via 1-wire bus
Polymer humidity capacitor
humidity 0-100%RH;
humidity +-2%RH(Max +-5%RH);
humidity 0.1%RH;
humidity +-1%RH;
+-0.3%RH
+-0.5%RH/year
fully interchangeable
temperature -40~80Celsius
temperature +-0.5Celsius
temperature 0.1Celsius
temperature +-0.2Celsius
Thomas Liu (Sales Manager)
-1-




AM2302 pdf, 반도체, 판매, 대치품
Your specialist in innovating humidity & temperature sensors
Data-bus's free status is high voltage level. When communication between MCU and AM2302 begins, MCU will
pull low data-bus and this process must beyond at least 1~10ms to ensure AM2302 could detect MCU's signal, then
MCU will pulls up and wait 20-40us for AM2302's response.
When AM2302 detect the start signal, AM2302 will pull low the bus 80us as response signal, then AM2302 pulls
up 80us for preparation to send data. See below figure:
------------------------------------------------------------------------------------------------------------------------------------
2). Step 2: AM2302 send data to MCU
When AM2302 is sending data to MCU, every bit's transmission begin with low-voltage-level that last 50us, the
following high-voltage-level signal's length decide the bit is "1" or "0". See below figures:
Attention:
If signal from AM2302 is always high-voltage-level, it means AM2302 is not working properly, please check
the electrical connection status.
Thomas Liu (Sales Manager)
-4-

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