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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)

Figure 4: AM2321 wiring diagram

7.2 Power supply pin (VDD GND)

AM2321 supply voltage range of 2.6V - 5.5V.

7.3 Serial clock input (SCL)

The SCL pin is used to communicate the choice and I 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 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 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 C and a single bus

AM2321 serial interface, and power consumption reading sensor signal aspects are optimized

processing. Sensor uses a single bus, I 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 C. Single bus is fully compatible with the

company's other products, single-bus communication; I C communication in accordance with

2

2

2

2

2

2

2

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