VL6624 datasheet(42/106 Pages) STMICROELECTRONICS

42 / 106 page

Host communication - I²C control interface

VL6624/VS6624

42/106

10.10

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 28. 16-bit index, 8-bit data random index, single data read

10.11

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 29. 16-bit index, 8-bit data 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

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)

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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