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AM2320 Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers

Part No. AM2320
Description  Digital Temperature and Humidity Sensor
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Maker  ETC2 [List of Unclassifed Manufacturers]
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Figure 11: C bus master sends the data to the machine from the basic format
Figure 12: I
2
C bus master basic format for receiving data from a machine
8.2 AM2320 sensor I
2 C communication protocol
AM2320 serial interface for the I
2 C bus, in full accordance with I 2 C standard protocols
addressing, can be directly linked to the I
2 C bus. AM2320 sensor I 2 C address of the c(SLAVE
ADDRESS) 0xB8, on the basis of I
2 C standard protocol on the bus, based on Mod Bus protocol,
developed a unique communication protocol, reducing the transmission error rate. When micro
controller read AM2320 sensors strict accordance with AM2320 sensor I
2 C -Mod Bus
communication protocol design and timing.
8.2.1 I
2 C Interface Description
AM2320 digital temperature and humidity sensor as a communication from the machine, and
the host (user microprocessor) between uses the standard I
2 C bus mode. For the accurate
measurement of humidity, temperature and humidity to reduce the impact of, AM2320 sensors
during non-working, automatically become dormant, in order to reduce public consumption, to
reduce the impact sensor self-heating of the ambient humidity values. AM2320 uses passive mode,
which hosts the wake sensor by instruction, and then send the appropriate commands to read the
appropriate temperature and humidity values; After the communication, the sensor triggers a
temperature and humidity acquisition; Therefore, if there is no time to read the sensor, please read
two consecutive second sensor (minimum interval of two reads 2s), is the latest in a second
measurement; after the acquisition sensor automatically become dormant. The next time you need to
read the host sensor, sensors need to reawaken. It should be noted that the host communication from
start to finish, for a maximum of 3s. If communication is not completed within 3s, sensors
automatically end communication, automatically become dormant again as the host read sensors,
needed to re-send a wakeup command.
8.2.2 interface Features
This section describes the I
2 C interface characteristics AM2320 sensor, if you want to get the
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