VL6524 datasheet(39/70 Pages) STMICROELECTRONICS

39 / 70 page

VL6524/VS6524

Host communication - I²C control interface

39/70

Random location, single data read

When a location is to be read, but the value of the stored index is not known, a write

message with no data byte must be written first, specifying the index. The read message

then completes the message sequence. To avoid relinquishing the serial to bus to another

master a repeated start condition is asserted between the write and read messages.

As mentioned in the previous example, the read message is terminated with a negative

acknowledge (A) from the master.

Figure 27.

Random location, single data read

Multiple location write

For messages with more than 1 data byte the internal register index is automatically

incremented for each byte of data output, making it possible to write data bytes to

consecutive adjacent internal registers without having to send explicit indexes prior to

sending each data byte.

Figure 28.

Multiple location write

‘0’ (Write)

DEV ADDR R/W A

DATA

INDEX[7:0]

INDEX[15:0]

value, M

INDEX[15:8]

DATA

DATA[7:0]

DEV ADDR R/W A

‘1’ (Read)

Previous Index Value, K

Index M

No Data Write

Data Read

16-bit Index, 8-bit data random index, single data read

A = Acknowledge

A = Negative Acknowledge

S = START Condition

Sr = repeated START

P = STOP Condition

From Slave to Master

From Master to Slave

‘0’ (Write)

DEV ADDR R/W A

DATA

A/A

DATA

INDEX[7:0]

DATA[7:0]

INDEX[15:0]

value, M

DATA[7:0]

INDEX[15:8]

DATA

DATA[7:0]

N Bytes of Data

Previous Index Value, K

Index M

Index (M + N - 1)

16-bit index, 8-bit data multiple location write

A = Acknowledge

A = Negative Acknowledge

S = START Condition

Sr = repeated START

P = STOP Condition

From Slave to Master

From Master to Slave

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