- 26 -

low as 80 microseconds response signal, followed by 80 microsecond high output peripheral is ready

to receive data notification signal transmitter 22 shown in fig.

Figure 22: Single-bus timing diagram decomposition

Step Three:

AM2321 After sending the response, followed by a continuous serial data bus SDA data output

40, the microprocessor 40 receives the data according to I / O level changes.

Bit data "0" in the form: low high 50 microseconds plus 26-28 microseconds;

Bit data "1" format: LOW HIGH plus 70 microseconds 50 microseconds;

Bit data "0", the bit data "1" signal format shown in Figure 23.

Figure 23: Single-bus timing diagram decomposition

Data bus SDA AM2321 output 40-bit of data , the continued output low 50 microseconds after

the entry into the state, due to the pull-up resistor attendant goes high. Meanwhile AM2321 retest

internal temperature and humidity data, and record data, test recording ends, the micro controller

automatically goes to sleep. Only after receipt of the start signal micro controller host, only to

re-awaken the sensor, enter the working state.

8.3.5 Peripheral read flowchart

AM2321 sensor reads a single bus flowchart diagram shown in Figure 24, we also provide

sample code reads C51, need to download the client, please visit our website (www.aosong.com)

associated download, this manual does not provide code description.

Aosong Guangzhou Electronics Co., Ltd.

Order Phone: 4006 305378

Enterprise QQ: 4006305378

www.aosong.com