LSM320HAY30 STMicroelectronics, LSM320HAY30 Datasheet - Page 20

• Manufacturer Part Number: LSM320HAY30
• Description: Mems Motion Sensor Module 3d Digital Accelerometer And 2d Pitch And Yaw Analog Gyroscope
• Manufacturer: STMicroelectronics

Digital interfaces
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6.1
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Digital interfaces
The registers embedded in the LSM320HAY30 may be accessed through both the I
SPI serial interfaces. The latter may be software 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 I
CS line must be tied high (i.e. connected to Vdd_IO).
Table 7.
I
The LSM320HAY30 I
whose content can also be read back.
The relevant I
Table 8.
There are two signals associated with the I
data line (SDA). The latter is a bidirectional line used for sending and receiving the data
to/from the interface. Both the lines are connected to Vdd_IO through a pull-up resistor
embedded inside the LSM320HAY30. When the bus is free, both the 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
SA0
SDI
CS
Serial interface pin description
Serial interface pin description
2
C terminology is given in the table below.
SPI enable
I
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
2
2
C/SPI mode selection (1: I
C serial clock (SCL)
C serial data (SDA)
C less significant bit of the device address (SA0)
C is a bus slave. The I
Doc ID 16917 Rev 1
2
C bus: the serial clock line (SCL) and the serial
2
2
C is employed to write data into registers
C mode; 0: SPI enabled)
Pin description
Description
2
C standards as well as with normal
2
LSM320HAY30
C interface, the
2
C and