VL6180X datasheet(37/79 Pages) STMICROELECTRONICS

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VL6180X

I2C control interface

The VL6180X is controlled over an I2C interface. The default I2C address is 0x29 (7-bit).

This section describes the I2C protocol.

Figure 21. Serial interface data transfer protocol

Information is packed in 8-bit packets (bytes) always followed by an acknowledge bit, As for

sensor acknowledge and Am for master acknowledge. The internal data is produced by

sampling SDA at a rising edge of SCL. The external data must be stable during the high

period of SCL. The exceptions to this are start (S) or stop (P) conditions when SDA falls or

rises respectively, while SCL is high.

A message contains a series of bytes preceded by a start condition and followed by either a

stop or repeated start (another start condition but without a preceding stop condition)

followed by another message. The first byte contains the device address (0x52) and also

specifies the data direction. If the least significant bit is low (0x52) the message is a master

write to the slave. If the lsb is set (0x53) then the message is a master read from the slave.

Figure 22. I2C device address

All serial interface communications with the sensor must begin with a start condition. The

sensor acknowledges the receipt of a valid address by driving the SDA wire low. The state

of the read/write bit (lsb of the address byte) is stored and the next byte of data, sampled

from SDA, can be interpreted. During a write sequence the second and third bytes received

provide a 16-bit index which points to one of the internal 8-bit registers.

Figure 23. Single location, single write)

As/Am

Start condition

Stop condition

SDA

SCL

Acknowledge

Address or data byte

MSB

LSB

MSBit

LSBit

R/W

Sensor acknowledges

Acknowledge from sensor

ADDRESS[7:0]

INDEX[15:8]

INDEX[7:0]

DATA[7:0]

As P

0x52 (write)

Start

Stop

valid address

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