AN4450 datasheet(7/26 Pages) STMICROELECTRONICS

Part #	AN4450

Description	Hardware and software guidelines for use of LPS25H pressure sensor

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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DocID025978 Rev 1

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AN4450

Hardware (designing PCB schematics and layout)

26

2.1.2

Pin mapping

Table 1. LPS25H pin mapping details

Pin #

Name

Function

What to do

1

VDD_IO

Power supply for I/O pins

I/O supply voltage (1.7V ~ 3.6V)

2

SCL

SPC

I²C serial clock (SCL)

SPI serial port clock (SPC)

Optional pull-up resistor, connected to VDD_IO,

could be required for I²C (see I²C standard for

recommended value)

3

Reserved

Connect to PCB ground

4

SDA

SDI

SDIO

I²C serial data (SDA)

4-wire SPI serial data input (SDI)

3-wire SPI serial data input/output (SDIO)

Optional pull-up resistor, connected to VDD_IO,

could be required for I²C (see I²C standard for

recommended value)

5

SA0

SDO

I²C slave address select (SA0)

4-wire SPI serial data output (SDO)

SA0=1: 0xBA/BB I²C slave address + R/W

SA0=0: 0xB8/B9 I²C slave address + R/W

6CS

I²C/SPI mode selection

SPI chip select

CS=1: I²C mode

CS=ChipSelect in SPI mode

7

INT1

Interrupt 1 (or data ready)

Leave unconnected if unused

8

GND_IO

I/O pins ground

Connect to PCB ground

9

GND

Ground

Connect to PCB ground

10

VDD

Power supply

Supply voltage (1.7V ~ 3.6V)

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