VL6624 datasheet(41/106 Pages) STMICROELECTRONICS

41 / 106 page

VL6624/VS6624

Host communication - I²C control interface

41/106

10.8

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 26. Random location, single write

10.9

Current location, single data read

For the master reading from the slave the R/W bit is set to one. The register index of the

data returned is that accessed by the previous read or write message.

The first data byte returned by a read message is the contents of the internal index value

and NOT the index value. This was the case in older V2W implementations.

Note that the read message is terminated with a negative acknowledge (A) from the master:

it is not guaranteed that the master will be able to issue a stop condition at any other time

during a read message. This is because if the data sent by the slave is all zeros, the SDA

line cannot rise, which is part of the stop condition.

Figure 27. Current location, single read

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)

DATA

DATA[7:0]

DEV ADDR R/W A

‘1’ (Read)

Previous Index Value, K

16-bit index, 8-bit data current location, single data read

From Master to Slave

From Slave to Master

S = START Condition

Sr = repeated START

P = STOP Condition

A = Acknowledge

A = Negative Acknowledge

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