I²C interface

STUSB4700

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DocID030193 Rev 2

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 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

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

0

1

0

1

ADDR2

ADDR1

ADDR0

0/1

Register address format:

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

RegADDR7

RegADDR6

RegADDR5

RegADDR4

RegADDR3

RegADDR2

RegADDR1

RegADDR0

Register data format:

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

DATA7

DATA6

DATA5

DATA4

DATA3

DATA2

DATA1

DATA0