LPS25HB - pressure and altitude sensor 126kPa I2C / SPI 2.5-5.5V - Pololu 2867

Index: PLL-12988 EAN: 5903351249393

Sensor for measuring a pressure in the range from 26 kPa to 126 kPa with a accuracy at the level of ± 0,02 kPa. The measurement result can be easily converted to a height. Compared to the version of the LPS331AP, sensor has higher precision and reduced noise level.

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Manufacturer: Pololu
Compatibility: Arduino Raspberry Pi

Specification

  • Supply voltage: 2.5 V - 5.5 V
  • Current consumption: 2 mA
  • Communication interface: I2C (TWI) or SPI
  • Measurement range: 26 kPa to 126 kPa (260 mbar to 1260 mbar)
  • Data format: 24 bits
  • Built-in FIFO buffor
  • Accuracy:
    • for temperature: +20 ~ +60 °C: +/- 0,02 kPa
    • for temperature: 0 ~ +80 °C: +/- 0.1 kPa
  • Module size: 10.2 x 23.0 x 2.54 mm
  • Weight: 0.6 g (without connectors)

Version LPS25HB is characterized by greater stability and resistance to humidity relating to the version LPS25H.

Description

The module includes a pressure sensorMEMSLPS25H from the ST company, which operates in the rangefrom 26 kPa to 126 kPa. Compared to the version of theLPS331AP, with which the pin is compatible, it is characterized bya higher accuracy(up to 0.02 kPa)andlower noise (0,001 kPa). It also has a built-inbuffor FIFO, in which stored can be the measurement data before transmission. On the board are also requiredpassive componentsandvoltage regulator low-droput which enables the operation of the sensor with systems of 3.3 V and 5 V.


SystemLPS25H(documentation) has a built-in temperature compensation and a lot of configurable options, including: selectable resolutions, as well as two programmable external interrupts. The communication interface is I2C or SPI bus.

 

The product is compatible with Arduino

The manufacturer has preparedan Arduino library for the sensor LPS25H which allows for the simple maintenance of the sensor, using the module of Arduino.

 

Connection

The sensor has eight pins for the installation of goldpin connectors - 2.54 mm pitch (included).

 

The power supply is in the range of 2.5 V to 5.5 V, it should be connected to pins VIN and GND. In the case of using the system powered with a voltage of 3.3 V, the VIN pin can be left disconnected, and the power supply should be brought directly to the system via pin VDD.

 

The system communicates via a digital I2C or SPI interface. Voltage of the logic signals of the bus must have the same value as the supply voltage supplied to VIN. In the case of using I2C bus, the SCL and SDA pins should be connected. SPI requires the connection of 4 pins: SDI, SDO, CS and SPC.

    

 

PIN Description
SDA
SDI
SDO
The data line of the I2C bus, the line of the input SPI data (SDO in 3-wire mode). High status is equal to the voltage VIN, low GND.
SCL
SPC
Clock line of the I2C bus. High status is equal to voltage VIN, low GND.
SDO
SA0
The output data line of SPI bus (data-out) or change of address in case of I2C. High status is equal to VDD voltage, low GND.These pins do not have a voltage converter - they only work with a voltage of 3.3 V.
CS Chip select - SPI Enable. The pin is by default in high status (active I2C interface) to begin to communicate in SPI, you must specify the low status.
INT1 Programmable interrupts - high status is equal to voltage of 3.3 V, low GND.These pins do not have a voltage converter - they only work with a voltage of 3.3 V.
VIN Supply voltage is from 2.5 V to 5.5 V.
VDD In the case where the voltage is higher than 3.3 V, the pin can be the voltage output of 3.3 V with maximum current of up to 150 mA.
GND The potential of the ground of the system.

 

The I2C bus

By default, the system uses the I2C interface - the CS output is in high state (pulled up, using a resistor to VDD). Details about the I2C communication, can be found in the documentation and in cataloge note from NXP, about the specification of I2C bus.

The sensor has a 7-bit address, whose latest bit is determined with the help of the status on pin SA0. The pin is pulled up to VDD through a 10 kΩ resistor, what determines the address to a value of 1011101b.

The bus operates correctly with a frequency of 400 MHz (fast mode), higher values may work correctly but have not been tested.

 

The SPI bus

To choose the connection via the SPI, at pin CS, specified should be the low status (connected to ground). The details of the transfer and a description of the registers is in the documentation of the system.

 

Tips of first use

All the necessary information about communication and service of the module, are in the documentation. Below are several basic facts:

  • By default, the pressure sensor is in the mode of low consumption of energy, to run it, you must enter the appropriate value to the CTRL_REG1 register.
  • Possible is a multi-read and multi-write using one command of I2C, through the setting of the most significant bit of the address (starting autoinkrementation).
  • You can run autoinkrementation mode in SPI mode through setting the MS bit - details in documentation.

 

 

Same-day shipping

  • Crediting the payment for the order on our account on a business day before 10:00 AM means sending the goods on the same day.
  • All packages are being delivered by GLS Group courier and covered with insurance up to 1200 EUR.
  • You will receive a link to track your package and monitor the progress of delivery as soon as it is shipped.

Terms of delivery 

GLS - zone 1

Austria, Belgium, Croatia, The Czech Republic, Denmark, Germany, Netherlands, Poland, Slovakia 

  • Delivery time: 2-4 days
  • Delivery cost: from 4.18 EUR
  • Insurance: 1200 EUR
GLS - zone 2

Bulgaria, Estonia, France, Hungary, Italy, Latvia, Lithuania, Luxembourg, Portugal, Romania, San Marino, Slovenia

  • Delivery time: 2-5 days
  • Delivery cost: from 5.35 EUR
  • Insurance: 1200 EUR
GLS - zone 3

Finland, Greece, Ireland, Spain, Sweden 

  • Delivery time: 2-7 days
  • Delivery cost: from 7.67 EUR
  • Insurance: 1200 EUR

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