ILPS28QSW datasheet(11/52 Pages) STMICROELECTRONICS

11 / 52 page

Functionality

The ILPS28QSW is a high-resolution, digital output pressure sensor packaged in a CCLGA package with metal

lid. The complete device includes a sensing element based on a piezoresistive Wheatstone bridge approach and

an IC interface which communicates a digital signal from the sensing element to the application.

5.1

Sensing element

An ST proprietary process is used to obtain a silicon membrane for MEMS pressure sensors. When pressure is

applied, the membrane deflection induces an imbalance in the Wheatstone bridge piezoresistances whose output

signal is converted by the IC interface.

5.2

IC interface

The complete measurement chain is composed of a low-noise amplifier which converts the resistance unbalance

of the MEMS sensors (pressure and temperature) into an analog voltage using an analog-to-digital converter.

The pressure and temperature data may be accessed through an I²C/MIPI I3CSM interface thus making the

device particularly suitable for direct interfacing with a microcontroller.

The ILPS28QSW features a data-ready signal which indicates when a new set of measured pressure and

temperature data are available, thus simplifying data synchronization in the digital system that uses the device.

5.3

Factory calibration

The trimming values are stored inside the device in a non-volatile structure. When the device is turned on, the

trimming parameters are downloaded into the registers to be employed during the normal operation which allows

the device to be used without requiring any further calibration.

ILPS28QSW

Functionality

DS13905 - Rev 1

page 11/52

ILPS28QSW Datasheet(PDF) 11 Page - STMicroelectronics