STUSB4700 datasheet(16/32 Pages) STMICROELECTRONICS

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I²C interface

STUSB4700

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DocID030193 Rev 2

I²C interface

5.1

Read and write operations

The I²C interface is used to configure, control and read the status of the device. It is

compatible with the Philips I²C Bus® (version 2.1). The I²C is a slave serial interface based

on two signals:



SCL - serial clock line: input clock used to shift data



SDA - serial data line: input/output bidirectional data transfers

A filter rejects the potential spikes on the bus data line to preserve data integrity.

The bidirectional data line supports transfers up to 400 Kbit/s (fast mode). The data are

shifted to and from the chip on the SDA line, MSB first.

The first bit must be high (START) followed by the 7-bit device address and the read/write

control bit.

Eigth two 7-bit device addresses are available for STUSB4700 thanks to external

programming of DevADDR0, DevADDR11 and/or DevADDR2 through ADDR0,

ADDR1/ADDR2 pin setting. It allows to connect two up to 8 STUSB4700 devices on the

same I2C bus.

ADDR are not available for all configurations.

Device address format:

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

DevADDR6

DevADDR5

DevADDR4

DevADDR3

DevADDR2

DevADDR1

DevADDR0

R/W

ADDR2

ADDR1

ADDR0

0/1

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

RegADDR7

RegADDR6

RegADDR5

RegADDR4

RegADDR3

RegADDR2

RegADDR1

RegADDR0

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

DATA7

DATA6

DATA5

DATA4

DATA3

DATA2

DATA1

DATA0

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