lis3dsh STMicroelectronics, lis3dsh Datasheet - Page 22

• Manufacturer Part Number: lis3dsh
• Description: Mems Digital Output Motion Sensor Ultra Low-power High Performance Three-axis “nano” Accelerometer
• Manufacturer: STMicroelectronics

Digital interfaces
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Digital interfaces
The registers embedded inside the LIS3DSH may be accessed through both the I
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 pins. To select/exploit the I
CS line must be tied high (i.e. connected to Vdd_IO).
Table 9.
I
The LIS3DSH I
content can also be read back.
The relevant I
Table 10.
There are two signals associated with the I
data line (SDA). The latter is a bi-directional line used for sending and receiving the data
to/from the interface. Both lines must be connected to Vdd_IO through an external pull-up
resistor. When the bus is free, both lines are high.
The I
mode.
2
C serial interface
Transmitter
2
Pin name
Receiver
C interface is compliant with fast mode (400 kHz) I
Master
Term
Slave
SDO
SDO
SPC
SDA
SCL
SEL
SDI
CS
Serial interface pin description
Serial interface pin description
2
C terminology is given in the table below.
2
C is a bus slave. The I
SPI enable
I2C/SPI mode selection (1: SPI idle mode / I2C communication
enabled; 0: SPI communication mode / I2C disabled)
I
SPI serial port clock (SPC)
I
SPI serial data input (SDI)
3-wire interface serial data output (SDO)
I
SPI serial data output (SDO)
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
2
2
2
C serial clock (SCL)
C serial data (SDA)
C address selection
Doc ID 022405 Rev 1
2
C is employed to write data into registers whose
2
C bus: the serial clock line (SCL) and the serial
Pin description
Description
2
C standards as well as with normal
2
C interface, the
2
LIS3DSH
C and