AM2302 Просмотр технического описания (PDF) - Unspecified

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AM2302

Temperature and humidity module

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7.3 Single-bus communication timing

User host (MCU) to send a start signal (data bus SDA line low for at least 800μ s) after AM2302 from Sleep

mode conversion to high-speed mode.The host began to signal the end of the AM2302 send a response signal

sent from the data bus SDA serial 40Bit's data, sends the byte high; data sent is followed by: Humidity high、

Humidity low、Temperature high、Temperature low、Parity bit，Send data to the end of trigger information

collection, the collection end of the sensor is automatically transferred to the sleep mode, the advent until the

next communication.

Detailed timing signal characteristics in Table 6，Single-bus communication timing diagram Pic 6：

Pic 6：AM2302 Single-bus communication timing

Note: the temperature and humidity data read by the host from the AM2302 is always the last measured value, such as the

two measurement interval is very long, continuous read twice to the second value of real-time temperature and humidity values,

while two readtake minimum time interval be 2S.

Symbol

Tbe

Tgo

Trel

Treh

TLOW

TH0

TH1

Ten

Table 6: Single bus signal characteristics

Parameter

min typ max

Host the start signal down time 0.8

1

20

Bus master has released time

20 30 200

Response to low time

75

80

85

In response to high time

75

80

85

Signal "0", "1" low time

48

50

55

Signal "0" high time

22

26

30

Signal "1" high time

68

70

75

Sensor to release the bus time

45

50

55

Unit

mS

µS

µS

µS

µS

µS

µS

µS

Note：To ensure the

accurate communication

of the sensor, the read

signal, in strict

accordance with the

design parameters and

timing in Table 6 and

Figure 6.

7.4 Peripherals read step example

Communication between the host and the sensor can read data through the following three steps to

complete.

Step 1

AM2302 have to wait for the power (on AM2302 power 2S crossed the unstable state, the device can not

send any instructions to read during this period), the test environment temperature and humidity data, and

record data, since the sensor into a sleep state automatically. AM2302 The SDA data line from the previous

pull-up resistor pulled up is always high, the AM2302 the SDA pin is in input state, the time detection of

external signal.

Aosong(Guangzhou) Electronics Co.,Ltd.

TEL：020-36042809 / 36380552

-6-

www.aosong.com

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