STA350B datasheet(32/94 Pages) STMICROELECTRONICS

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I2C bus specification

STA350B, STA350BW

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DocID018572 Rev 7

the device address and if a match is found, it acknowledges the identification on the SDA

bus during the 9th bit time. The byte following the device identification byte is the internal

space address.

7.3

Write operation

Following the START condition the master sends a device select code with the RW bit set

to 0. The STA350Bx acknowledges this and then writes the byte of the internal address.

After receiving the internal byte address the STA350Bx again responds with an

acknowledgment.

7.3.1

Byte write

In the byte write mode the master sends one data byte, which is acknowledged by the

STA350Bx. The master then terminates the transfer by generating a STOP condition.

7.3.2

Multi-byte write

The multi-byte write modes can start from any internal address. The master generating a

STOP condition terminates the transfer.

7.4

Read operation

7.4.1

Current address byte read

Following the START condition the master sends a device select code with the RW bit set

to 1. The STA350Bx acknowledges this and then responds by sending one byte of data. The

master then terminates the transfer by generating a STOP condition.

7.4.2

Current address multi-byte read

The multi-byte read modes can start from any internal address. Sequential data bytes are

read from sequential addresses within the STA350Bx. The master acknowledges each data

byte read and then generates a STOP condition, terminating the transfer.

7.4.3

Random address byte read

Following the START condition the master sends a device select code with the RW bit set

to 0. The STA350Bx acknowledges this and then the master writes the internal address

byte. After receiving the internal byte address, the STA350Bx again responds with an

acknowledgement. The master then initiates another START condition and sends the device

select code with the RW bit set to 1. The STA350Bx acknowledges this and then responds

by sending one byte of data. The master then terminates the transfer by generating a STOP

condition.

7.4.4

Random address multi-byte read

The multi-byte read modes can start from any internal address. Sequential data bytes are

read from sequential addresses within the STA350Bx. The master acknowledges each data

byte read and then generates a STOP condition, terminating the transfer.

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