VS6724 datasheet(45/118 Pages) STMICROELECTRONICS

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VS6724

Host communication - I²C control interface

45/118

Figure 32.

Internal register index space

3.3

Types of messages

This section gives guidelines on the basic operations to read data from and write data to

VS6724.

The serial interface supports variable length messages. A message contains no data bytes

or one data byte or many data bytes. This data can be written to or read from common or

different locations within the sensor. The range of instructions available are detailed below.

●

Single location, single byte data read or write.

●

Write no data byte. Only sets the index for a subsequent read message.

●

Multiple location, multiple data read or write for fast information transfers.

Any messages formats other than those specified in the following section should be

considered illegal.

3.3.1

Random location, single data write

For the master writing to the slave the R/W bit is set to zero.

The register index value written is preserved and is used by a subsequent read. The write

message is terminated with a stop condition from the master.

65532

65533

65534

65535

16-bit Index / 8-bit Data Format

64k by 8-bit wide index space

(Valid Addresses 0-65535)

130

129

128

127

126

125

8 bits

VS6724 Datasheet(PDF) 45 Page - STMicroelectronics