STUSB1600 datasheet(24/69 Pages) STMICROELECTRONICS

24 / 69 page

I2C interface

STUSB1600

24/69

DocID028937 Rev 1

I2C interface

4.1

Read and write operations

The I²C interface is used to configure, control and read the operation 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.

Two 7-bit device address are available for STUSB1600 thanks to external programming of

DevADDR0 through ADDR0 pin setting, i.e. 0x28 or 0x29. It allows two STUSB1600

devices to be connected on the same I2C bus.

Figure 4. Read operation

Table 12. Device address format

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

DevADDR6 DevADDR5 DevADDR4 DevADDR3 DevADDR2 DevADDR1 DevADDR0

R/W

0101

ADDR0

0/1

Table 13. Register address format

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

RegADDR7 RegADDR6 RegADDR5 RegADDR4 RegADDR3 RegADDR2 RegADDR1 RegADDR0

Table 14. Register data format

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

DATA7

DATA6

DATA5

DATA4

DATA3

DATA2

DATA1

DATA0

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