VL6524 datasheet(37/70 Pages) STMICROELECTRONICS

37 / 70 page

VL6524/VS6524

Host communication - I²C control interface

37/70

Types of messages

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

VL6524/VS6524.

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.

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.

Figure 25.

Random location, single write

DEV ADDR R/W A

DATA

A/A

DATA

INDEX[7:0]

DATA[7:0]

INDEX[15:8]

Previous Index Value, K

Index M

16-bit Index, 8-bit Data, Random Location, Single Data Write

Index[15:0]

value, M

DATA[7:0]

From Master to Slave

From Slave to Master

S = START Condition

Sr = repeated START

P = STOP Condition

A = Acknowledge

A = Negative Acknowledge

‘0’ (Write)

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