LPS22HH datasheet(26/59 Pages) STMICROELECTRONICS

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Digital interfaces

LPS22HH

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Digital interfaces

7.1

Serial interfaces

The registers embedded in the LPS22HH may be accessed through either the I²C, MIPI

I3CSM or 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, the

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

7.2

I²C serial interface (CS = high)

The LPS22HH 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 Table10.

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 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 9. Serial interface pin description

Pin name

Pin description

SPI enable

I²C/SPI mode selection

(1: SPI idle mode / I²C communication enabled;

0: SPI communication mode / I²C disabled)

SCL/SPC

I²C serial clock (SCL)

SPI serial port clock (SPC)

SDA

SDI

SDI/SDO

I²C serial data (SDA)

4-wire SPI serial data input (SDI)

3-wire serial data input /output (SDI/SDO)

SDO

SAO

4-wire SPI serial data output (SDO)

I²C less significant bit of the device address (SA0)

Table 10. I²C 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

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