STW8019 datasheet(42/55 Pages) STMICROELECTRONICS

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Bus interface

STw8009/STw8019

42/55

Bus interface

6.1

2 wire serial MPU control interface (I2C compatible)

STw8009/STw8019 serial MPU control interface is compliant with I2C standard and acts

only as a slave device. It supports 100 kHz and 400 kHz speeds. In addition to the basic

definition of the I2C standard (SDA & SCL signals), STw8009/STw8019 serial MPU interface

has an additional “Add” input used to select one out of two slave addresses.

The device supports 7-bit and 10-bit addresses.

7-bit address mode

In Write mode, several data can be sent without re-initializing a transfer and data is written in

successive registers. (

Figure 13: 2-wire serial MPU control interface format (I2C compatible)

/ 7-bit addresses).

In Read mode: (

Figure 13).

●

Double transaction read: The operation is split into to transactions:

The first one is a write that transmits the desired address. The I2C interface memorizes

the address of the register.

The second transfer is a read that can be repeated to read successive registers. After

each read byte and except for the last one, the master issues an “acknowledge”. The

master indicates that it is reading the last byte by issuing a “no acknowledge” instead of

an “acknowledge”.

●

Single transaction read:

As opposed to the double transaction, instead of stopping the first transaction and

starting the second one, the transactions are combined with a repeated start condition.

Table 20.

STw8009/STw8019 addresses

7-bit addresses

10-bit addresses

Read

Write

Read

Write

Add pin = 0

01000001

01000000

00001000001

00001000000

Add pin = 1

01000011

01000010

00001000011

00001000010

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