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AM2320 Folha de dados(PDF) 5 Page - List of Unclassifed Manufacturers

Nome de Peças AM2320
Descrição Electrónicos  Digital Temperature and Humidity Sensor
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Fabricante Electrônico  ETC2 [List of Unclassifed Manufacturers]
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2
SDA
Serial data, bidirectional port
3
GND
Ground
4
SCL
Serial clock input port (single bus ground)
7.2 Power supply pin (VDD GND)
AM2320 supply voltage range of 3.1V - 5.5V.
7.3 Serial clock input (SCL)
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 AM2320,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
AM2320 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
standard protocols addressing, can be directly linked to the I
2 C bus (the bus is only allowed to
hang a product), without additional wiring, operation simple. Read AM2320 sensors, strictly in
accordance with the agreement of the two communication methods and timing proceed. Specific
details see single communication protocol and I
2 C bus communication protocol detailed.
8.1 I
2 C standard communication protocol introduced
8.1.1 I
2 introduction to C-bus
Another form of AM2320 processor and micro controller interface is I
2 C serial bus, in this
brief introduction about the I
2 C bus protocol standards. Due to space limitations, can’t list all the
contents of the agreement deeper questions, please consult the relevant information (refer to the
Philips website access).
8.1.2 I
2 C Bus Overview
Philips (Philips) at 20 years ago invented a simple two-wire bidirectional serial communication
bus, the bus is called the Inter-I
2 C bus. Currently I 2 C bus has become the industry standard solution
for embedded application, is widely used in a variety of professional-based micro controller,
- 4 -


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