STV9432TAP datasheet(7/25 Pages) STMICROELECTRONICS

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STV9432TAP

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7 - SERIAL INTERFACE

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

connected to the I

2C bus, a device must own its slave

address; the slave address of the STV9432TAP is BA

(in hexadecimal).

7.1 - Data Transfer in Write Mode

The host MCU can write data into the STV9432TAP

registers or RAM.

To write data into the STV9432TAP, 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,

- The successive bytes of data.

All bytes are sent MSB bit first and the write data

transfer is closed by a stop.

7.2 - Data Transfer in Read Mode

The host MCU can read data from the STV9432TAP

To read data from the STV9432TAP (Figure 3), the

MCU must send 2 different I

2C sequences. The first

one is made of I

2C slave address byte with R/W bit at

low level and the 2 internal address bytes.

The second one is made of I

2C 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. I

2C Write Operation

Figure 3. I2C Read Operation

101

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

2C Slave Address

ACK

LSB Address

ACK

MSB Address

ACK

Start

A13 A12

A10 A10

Stop

SCL

SDA

R/W

2C Slave Address

ACK

Data Byte n

ACK

Start

Stop

Data Byte 1

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