AM2302 データシートの表示（PDF） - Unspecified

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AM2302

Temperature and humidity module

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Pic4： AM2302 Typical circuits for single bus

7.2、Single-bus communication protocol

◎Single bus Description

AM2302 device uses a simplified single-bus communication. Single bus that only one data line, data

exchange system, controlled by the data line to complete. Equipment (microprocessor) through an

open-drain or tri-state port connected to the data line to allow the device does not send data to release the

bus, while other devices use the bus; single bus usually require an external about 5.1kΩ pull-up resistor, so

when the bus is idle, its status is high. Because they are the master-slave structure, only the host calls the

sensor, the sensor will answer, so the hosts to access the sensor must strictly follow the sequence of single bus,

if there is a sequence of confusion, the sensor will not respond to the host.

◎Single bus to send data definition

SDA For communication and synchronization between the microprocessor and the AM2302, single-bus

data format, a transmission of 40 data, the high first-out. Specific communication timing shown in Figure 5,

the communication format is depicted in Table 5.

Pic5： AM2302 Single-bus communication protocol

Aosong(Guangzhou) Electronics Co.,Ltd.

TEL：020-36042809 / 36380552

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www.aosong.com

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