VS6724 datasheet(43/118 Pages) STMICROELECTRONICS

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VS6724

Host communication - I²C control interface

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When a read is performed master acknowledges data.

Repeat 4 and 5 until all the required data has been written or read.

Minimum number of data bytes for a read =1 (Shortest Message length is 2-bytes).

The master outputs a negative acknowledge for the data when reading the last byte of data.

This causes the slave to stop the output of data and allows the master to generate a STOP

condition.

Master generates a STOP condition or a repeated START.

Figure 28.

Device addresses

3.2.1

Data valid

The data on SDA is stable during the high period of SCL. The state of SDA is changed

during the low phase of SCL. The only exceptions to this are the start (S) and stop (P)

conditions as defined below. (See

I²C slave interface for full timing specification).

Figure 29.

SDA data valid

3.2.2

Start (S) and Stop (P) conditions

A START (S) condition defines the start of a V2W message. It consists of a high to low

transition on SDA while SCL is high.

A STOP (P) condition defines the end of a V2W message. It consists of a low to high

transition on SDA while SCL is high.

After STOP condition the bus is considered free for use by other devices. If a repeated

START (Sr) is used instead of a stop then the bus stays busy. A START (S) and a repeated

START (Sr) are considered to be functionally equivalent.

R/W

Sensor address

Sensor write address 20H

Sensor read address 21H

SDA

SCL

Data line

stable

Data valid

Data change

Data line

stable

Data valid

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