- 6 -

Figure 5: I

C typical configuration

8.1.3 I C bus protocol specification

◎I C Bus Definition of Terms

I C bus connection via the serial data (SDA) and serial clock (SCL) lines on the bus, so that

each device to transmit information between the device has a unique address recognition, and can be

used as a transmitter or receiver (the device's functions decision), the device when performing data

transfers can also be seen as a master or slave, the master is initialized data transmission device

allows the transmission bus and generates a clock signal. At this time, any device addressed is

considered a slave. I C bus terms are defined in detail in Table 5.

◎I C-bus transfer rate

I C bus communication rate controlled by the host, to fast to slow. However, the maximum rate

is limited, the transfer rate on a I C bus data in standard mode speeds up to 100Kb / s.

◎I C Bus bit transmission

I C bus bit transmitted through the data line SDA and SCL clock line two lines together to

complete. During high clock line SCL and SDA data line represents the current transmission is low

logic level "0"; during high clock line SCL and SDA data line is high logic level represents the

current transmission "1." Logic "0" (low) and "1" (high) level, is related to the level of VDD decision

(detailed in Table 3 AM2321 DC Characteristics table). In addition, each transmission of a data bit

clock pulse is generated.

Term

Description

Transmitter

Send data to the device bus

Receptor

Device receiving data from the bus

Host computer

Transmit clock signal generating device initialization and termination sent

2

2

2

2

2

2

2

2

2

2

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