VL6180 datasheet(35/73 Pages) STMICROELECTRONICS

35 / 73 page

DocID024986 Rev 14

35/73

VL6180

I2C control interface

As data is received by the slave it is written bit by bit to a serial/parallel register. After each

data byte has been received by the slave, an acknowledge is generated, the data is then

stored in the internal register addressed by the current index.

During a read message, the contents of the register addressed by the current index is read

out in the byte following the device address byte. The contents of this register are parallel

loaded into the serial/parallel register and clocked out of the device by the falling edge of

SCL.

Figure 25. Single location, single read

At the end of each byte, in both read and write message sequences, an acknowledge is

issued by the receiving device (that is, the sensor for a write and the master for a read).

A message can only be terminated by the bus master, either by issuing a stop condition or

by a negative acknowledge (that is, not pulling the SDA line low) after reading a complete

byte during a read operation.

The interface also supports auto-increment indexing. After the first data byte has been

transferred, the index is automatically incremented by 1. The master can therefore send

data bytes continuously to the slave until the slave fails to provide an acknowledge or the

master terminates the write communication with a stop condition. If the auto-increment

feature is used the master does not have to send address indexes to accompany the data

bytes.

Figure 26. Multiple location write

Figure 27. Multiple location read

ADDRESS[7:0]

INDEX[15:8]

INDEX[7:0]

As P

0x52 (write)

ADDRESS[7:0]

DATA[7:0]

0x53 (read)

ADDRESS[7:0]

INDEX[15:8]

INDEX[7:0]

0x52 (write)

DATA[7:0]

ADDRESS[7:0]

INDEX[15:8]

INDEX[7:0]

As P

0x52 (write)

ADDRESS[7:0]

DATA[7:0]

0x53 (read)

DATA[7:0]

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