SN8F5708 datasheet(151/204 Pages) SONIX

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SN8F5708 Series

I2C

Datasheet Rev. 2.4

151

22 I2C

The I2C is a serial communication interface for data exchanging from one MCU to one MCU or

other hardware peripherals. The device can transmit data as a master or a slave with two

bi-directional IO, SDA (Serial data output) and SCL (Serial clock input).

When a master transmit data to a slave, it’s called “WRITE” operation; when a slave transmit data

to a master, it’s called “READ” operation. It also supports multi-master communication and keeps

data transmission correctly by an arbitration method to decide one master has the control on bus

and transmit its data.



Master Tx, Rx Mode



Slave Tx, Rx mode (with general address call) for multiplex slave in single master situation.



2-wire synchronous data transfer/receiver.



Support 100K/400K clock rate.

22.1

I2C Protocol

I2C transmission structure includes a START(S) condition, 8-bit address byte, one or more data byte

and a STOP (P) condition. START condition is generated by master to initial any transmission.

Data is transmitted with the Most Significant Bit (MSB) first. In address byte, the higher 7-bit is

address bit and the lowest bit is data direction (R/W) bit. When R/W=0, it assigns a “WRITR”

operation. When R/W=1, it assigns a “READ” operation.

After each byte is received, the receiver (a master or a slave) must send an acknowledge (ACK). If

transmitter can’t receive an ACK, it will recognize a not acknowledge (NACK). In WRITE operation,

the master will transmit data to the slave and then waits for ACK from slave. In READ operation,

the slave will transmit data to the master and then waits for ACK from master. In the end, the

master will generate a STOP condition to finish transmission.

Transmit Address

ACK

SDA

SCL

Transmission Data

R/W

Ack signal from

receiver

SCL held low,

while interrupt executing

NACK

Nack signal from receiver

START Condition

STOP Condition

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