LIS3DH 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

比赛名单

LIS3DH

MEMS digital output motion sensor ultra low-power high performance 3-axes “nano” accelerometer

STMicroelectronics 

Digital interfaces

6

Digital interfaces

LIS3DH

The registers embedded inside the LIS3DH 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 serial interfaces are mapped onto the same pads. To select/exploit the I2C interface, CS

line must be tied high (i.e. connected to Vdd_IO).

Table 10. Serial interface pin description

Pin name

Pin description

CS

SCL

SPC

SDA

SDI

SDO

SA0

SDO

SPI enable

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

I2C serial clock (SCL)

SPI serial port clock (SPC)

I2C serial data (SDA)

SPI serial data input (SDI)

3-wire interface serial data output (SDO)

I2C less significant bit of the device address (SA0)

SPI serial data output (SDO)

6.1

I2C serial interface

The LIS3DH I2C is a bus slave. The I2C is employed to write data into registers whose

content can also be read back.

The relevant I2C terminology is given in the table below.

Table 11. Serial interface pin description

Term

Description

Transmitter

Receiver

Master

Slave

The device which sends data to the bus

The device which receives data from the bus

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

transfer

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

resistor. When the bus is free both the lines are high.

The I2C interface is compliant with fast mode (400 kHz) I2C standards as well as with the

normal mode.

20/42

Doc ID 17530 Rev 1

Share Link: