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PDF AM2321 Data sheet ( Hoja de datos )
| Número de pieza | AM2321 | |
| Descripción | Digital temperature and humidity sensor | |
| Fabricantes | Aosong | |
| Logotipo |  |
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Digital Temperature and Humidity Sensor
AM2321 Product Manual
Product Features:
Ultra-small size
Ultra Low Power
Ultra-low voltage operation
Excellent long-term stability
Standard I2C and single-bus output
For more information, please visit: www. aosong .com
1 page  
7. Interface Definition
7.1 AM2321 pin assignment
Table 4: AM2321 pin assignment
Pin Name
Description
1 VDD
Power supply(2.6 -5.5V)
2 SDA
Serial data, bidirectional port
v3 GND
Ground
4 SCL Serial clock input port (single bus ground)
7.2 Power supply pin (VDD GND)
AM2321 supply voltage range of 2.6V - 5.5V.
7.3 Serial clock input (SCL)
Figure 4: AM2321 wiring diagram
The SCL pin is used to communicate the choice and I 2 C sensor communication clock line.
When the power is held low while SCL remains low even 500ms, which means that the user selects a
single bus mode of communication, otherwise I 2 C communications; After selecting the formula
mode during power, sensor communication mode remains unchanged; If you want to change
communication, re-power on, press the select operation requires communication.
When choosing the I 2 C communication between microprocessor and AM2321,SCL for the
synchronous communication.
7.4 Serial data(SDA)
SDA pin is three-state structure for reading, writing sensor data. Detailed Description of specific
communication sequence, see communication method..
8. I 2 C and a single bus
AM2321 serial interface, and power consumption reading sensor signal aspects are optimized
processing. Sensor uses a single bus, I 2 C outputs two communication modes, communication can be
switched freely, easy to use. SCL bus signal line to level when power to determine their bus
communication: SCL is held low on power as a single bus communication mode; SCL remain high
when compared to the power of communication modes I 2 C. Single bus is fully compatible with the
company's other products, single-bus communication; I 2 C communication in accordance with
-4-
Aosong Guangzhou Electronics Co., Ltd. Order Phone: 4006 305378 Enterprise QQ: 4006305378 www.aosong.com
5 Page 
Figure 12: I2 C bus master basic format for receiving data from a machine
8.2 AM2321 sensor I 2 C communication protocol
AM2321 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. AM2321 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 AM2321 sensors strict accordance with AM2321 sensor I 2 C -Mod Bus
communication protocol design and timing.
8.2.1 I 2 C Interface Description
AM2321 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, AM2321 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. AM2321 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 AM2321 sensor, if you want to get the
best communication with the sensor results, designed in strict compliance with the conditions of
Figure 13 and Table 6 design.
- 10 -
Aosong Guangzhou Electronics Co., Ltd. Order Phone: 4006 305378 Enterprise QQ: 4006305378 www.aosong.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AM2321.PDF ] | |
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