AM2302 데이터 시트보기 (PDF) - Unspecified

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AM2302

Temperature and humidity module

Unspecified 

Step 2

Microprocessor I/O set to output, while output low, and low hold time can not be less than 800us, typical

values are down 1MS, then the microprocessor I/O is set to input state, the release of the bus, due to the

pull-up resistor, the microprocessor I/O AM2302 the SDA data line also will be high, the bus master has

released the AM2302 send a response signal, that is, the output 80 microseconds low as the response signal,

tightthen output high of 80 microseconds notice peripheral is ready to receive data signal transmission as shown

to Pic7 :

Pic7：Single bus decomposition of the timing diagram

Step 3

AM2302 sending the response, followed by the data bus SDA continuous serial output 40 data, the

microprocessor receives 40 data I/O level changes.

Bit data "0" format: 26-28 microseconds 50 microseconds low plus high;

Bit data "1" format: the high level of low plus, 50 microseconds to 70 microseconds;

Bit data "0" bit data "1" format signal shown to pic 8:

Pic 8：The single bus break down the timing diagram

AM2302 data bus SDA output 40 data continue to output the low 50 microseconds into the input state,

followed by pull-up resistor goes high. AM2302 internal re-test environmental temperature and humidity data,

and record the data, the end of the test records, the microcontroller automatically into hibernation.

Microcontroller only after receipt of the start signal of the host wake-up sensor, into the working state.

7.5 Peripheral to read flow chart

AM2302 sensor read single bus flow chart diagram shown in Figure 9, we also provide the C51 read the

code examples, customers need to download, please visit our website (www.aosong.com) related to

downloadthis manual does not provide the code description.

Aosong(Guangzhou) Electronics Co.,Ltd.

TEL：020-36042809 / 36380552

-7-

www.aosong.com

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