AN2381 datasheet(12/47 Pages) STMICROELECTRONICS

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Digital interfaces

AN2381

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Digital interfaces

The registers embedded inside the LIS3LV02DL may be accessed through I2C and SPI

serial interfaces. They are mapped onto the same pads. To select/exploit the I2C interface,

CS line must be tied high.

4.1

I2C Bus interface

The LIS3LV02DL I2C is a bus slave. The I2C is employed to write/read the data into/from the

registers.

The relevant I2C terminology is shown in Table 3:

There are two signals associated with the I2C bus: SCL and SDA.

These pins are described in the subsequent table:

SDA is a bidirectional line. Both SCL and SDA are connected to a positive supply voltage

via a pull-up resistor. When the bus is free both lines are HIGH.

Table 2.

I2C/SPI signals mapping

Pin Name

Description

SPI chip select (CS)

I2C/SPI selector (1: I2C mode; 0: SPI enabled)

SCL/SPC

SPI CK line (SPC)

I2C clock line (SCL)

SDI/SDA/SDO

SPI data in (SDI)

I2C serial data (SDA)

SPI data out (SDO) -when in 3-wire mode-

SDO

SPI data out (SDO) -when not in 3-wire mode-

Table 3.

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

Table 4.

I2C Pin Description

Term

Description

SCL

Serial CLock Line

SDA

Serial DAta Line

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