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LPS331AP Datasheet(PDF) 10 Page - STMicroelectronics

Part # LPS331AP
Description  MEMS pressure sensor: 260-1260 mbar absolute digital output barometer
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LPS331AP Datasheet(HTML) 10 Page - STMicroelectronics

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Digital interfaces
LPS331AP
10/36
Doc ID 022112 Rev 7
5
Digital interfaces
5.1
I2C serial interface
The registers embedded in the LPS331AP 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).
5.2
I2C serial interface
The LPS331AP 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 Table 8.
There are two signals associated with the I2C bus: the serial clock line (SCL) and the serial
data line (SDA). The latter is a bi-directional line used for sending and receiving the data
to/from the interface. Both lines have to be connected to Vdd_IO through pull-up resistors.
The I2C interface is compliant with fast mode (400 kHz) I2C standards as well as with the
normal mode.
Table 7.
Serial interface pin description
Pin name
Pin description
CS
SPI enable
I2C/SPI mode selection (1: I2C mode; 0: SPI enabled)
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)
SA0/
SDO
I2C less significant bit of the device address (SA0)
SPI serial data output (SDO)
Table 8.
Serial interface pin description
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


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