I²C interface

STUSB4710

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DocID030499 Rev 4

5

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 support 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.

Two 7-bit device addresses are available for the STUSB4710 thanks to external

programming of DevADDR0, through ADDR0, pin setting. It allows two STUSB4710

ADDR is not available for all configurations.

The device address format:

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

DevADDR6

DevADDR5

DevADDR4

DevADDR3

DevADDR2

DevADDR1

DevADDR0

R/W

0

1

0

1

0

0

ADDR0

0/1

The register address format:

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

RegADDR7

RegADDR6

RegADDR5

RegADDR4

RegADDR3

RegADDR2

RegADDR1

RegADDR0

The register data format:

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

DATA7

DATA6

DATA5

DATA4

DATA3

DATA2

DATA1

DATA0