STV9432 datasheet(6/18 Pages) STMICROELECTRONICS

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STV9432

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6 - SERIAL INTERFACE

The 2-wires serial interface is an I2C interface. To be

connected to the I2C bus, a device must own its slave

address; the slave address of the STV9432 is BA (in

hexadecimal).

6.1 - DATA TRANSFER IN WRITE MODE

The host MCU can write data into the STV9432 regis-

ters or RAM.

To write data into the STVA9432TA after a start, the

MCU must send (Figure 2):

- First, the I2C address slave byte with a low level for

the R/W bit,

- The two bytes of the internal address where the

MCU wants to write data(s),

- The successive bytes of data(s).

All bytes are sent MSB bit first and the write data

transfer is ended with a stop.

6.2 - DATA TRANSFER IN READ MODE

The host MCU can read data from the STV9432 reg-

isters, RAM or ROM.

To read data from the STV9432 (Figure 3), the MCU

must send 2 different I2C sequences. The first one

includes the I2C slave address byte with R/W bit at

low level and the 2 internal address bytes.

The second one includes the I2C slave address byte

with R/W bit at high level and all the successive data

bytes read at successive addresses starting from the

initial address given by the first sequence.

Figure 2. I2C Write Operation

Figure 3. I2C Read Operation

111

SCL

SDA

R/W

A13

A12

A11

A10

I2C Slave Address

ACK

LSB Address

ACK

MSB Address

ACK

Start

ACK

Data Byte 1

Data Byte 2

ACK

Data Byte n

Stop

SCL

SDA

SCL

SDA

R/W

I2C Slave Address

ACK

LSB Address

ACK

MSB Address

ACK

Start

A13 A12 A10 A10

Stop

SCL

SDA

R/W

I2C Slave Address

ACK

Data Byte n

ACK

Start

Stop

Data Byte 1

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