LSM6DSOX datasheet(18/199 Pages) STMICROELECTRONICS

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Digital interfaces

5.1

I²C/SPI interface

The registers embedded inside the LSM6DSOX may be accessed through both the I²C and SPI serial interfaces.

The latter may be SW configured to operate either in 3-wire or 4-wire interface mode. The device is compatible

with SPI modes 0 and 3.

The serial interfaces are mapped onto the same pins. To select/exploit the I²C interface, the CS line must be tied

high (i.e connected to Vdd_IO).

Table 8. Serial interface pin description

Pin name

Pin description

SPI enable

I²C/SPI mode selection (1: SPI idle mode / I²C communication enabled;

0: SPI communication mode / I²C disabled)

SCL/SPC

I²C Serial Clock (SCL)

SPI Serial Port Clock (SPC)

SDA/SDI/SDO

I²C Serial Data (SDA)

SPI Serial Data Input (SDI)

3-wire Interface Serial Data Output (SDO)

SDO/SA0

SPI Serial Data Output (SDO)

I²C less significant bit of the device address

5.1.1

I²C serial interface

The LSM6DSOX I²C is a bus slave. The I²C is employed to write the data to the registers, whose content can also

be read back.

The relevant I²C terminology is provided in the table below.

Table 9. I²C terminology

Term

Description

Transmitter

The device which sends data to the bus

Receiver

The device which receives data from the bus

Master

The device which initiates a transfer, generates clock signals and terminates a transfer

Slave

The device addressed by the master

There are two signals associated with the I²C bus: the serial clock line (SCL) and the Serial DAta line (SDA). The

latter is a bidirectional line used for sending and receiving the data to/from the interface. Both the lines must be

connected to Vdd_IO through external pull-up resistors. When the bus is free, both the lines are high.

The I²C interface is implemented with fast mode (400 kHz) I²C standards as well as with the standard mode.

In order to disable the I²C block, (I2C_disable) = 1 must be written in CTRL4_C (13h).

LSM6DSOX

Digital interfaces

DS12814 - Rev 3

page 18/199

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