STMicroelectronics LPS28DFWTR

Overview

LPS28DFWTR from STMicroelectronics is an ultra-compact, water-resistant piezoresistive absolute pressure sensor delivering 24-bit digital barometric output via I²C or MIPI I3CSM interface. It operates in dual full-scale modes (260–1260 hPa and 260–4060 hPa), achieves ±0.5 hPa absolute accuracy in Mode 1, and consumes as low as 1.7 μA at 1 Hz ODR - enabling high-resolution altimetry and depth sensing in space-constrained portable electronics.

For engineers reviewing the LPS28DFWTR datasheet, LPS28DFWTR pinout, LPS28DFWTR application, or LPS28DFWTR equivalent, this device supports critical design requirements including low-noise pressure measurement (0.32 Pa RMS), embedded temperature compensation, FIFO-driven power optimization, and robust environmental sealing for wearables, sport watches, and GPS-enhanced portable devices.

Technical Context

The LPS28DFWTR integrates a MEMS piezoresistive Wheatstone bridge sensing element with a low-noise analog front-end and 24-bit sigma-delta ADC. Its dual-mode pressure range selection (via FS_MODE bit) enables configurable resolution: 4096 LSB/hPa in Mode 1 (≤1260 hPa) and 2048 LSB/hPa in Mode 2 (≤4060 hPa), preserving sensitivity across consumer-grade altitude and depth monitoring use cases.

Digital logic includes programmable FIFO (128×24-bit slots), interrupt generation (data-ready, FIFO threshold, overflow), and factory-trimmed non-volatile calibration data. The IC supports six FIFO operating modes - including bypass-to-FIFO and continuous-to-FIFO - allowing host MCU wake-up synchronization without polling overhead.

Key Specifications

Pinout & Package

Package: CCLGA-7L (Ceramic Column Grid Array, 2.0 × 2.0 × 0.77 mm), metal-lid sealed with internal potting gel for IP68-level water resistance (10 ATM). Pin 7 (PAD2LID) provides optional electrical connection to the metal lid for EMI shielding or grounding per PCB layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar absolute pressure sensing applications.

Compared with BMP388TR and MS5637-02BA03, the LPS28DFWTR uniquely combines certified water resistance, guaranteed ±0.5 hPa absolute accuracy, 24-bit resolution, and integrated FIFO - making it the only option qualified for sealed consumer devices requiring long-term reliability in humid or submerged conditions.

Availability

LPS28DFWTR is available at Aetrix Electronics and suitable for wearable fitness trackers, sport watches, GPS augmentation modules, and water depth loggers requiring stable component supply across high-volume consumer production cycles.

Supply support for LPS28DFWTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in MEMS sensors, microcontrollers, and power management ICs for automotive, industrial, and consumer markets.

The LPS28DFWTR belongs to ST's LPS ultra-low-power pressure sensor family, engineered specifically for personal electronics demanding miniaturization, environmental resilience, and factory-calibrated accuracy without host-side compensation.

FAQ

What is the maximum overpressure rating of the LPS28DFWTR package?

The LPS28DFWTR's CCLGA-7L package is rated for 10 ATM (1 MPa) overpressure, verified through mechanical stress testing and long-term exposure to chlorine, bromine, and commercial detergents. This rating applies to the sealed gel-filled cavity and metal lid assembly - not the bare die - and supports reliable operation in e-cigarettes, dive watches, and waterproof action cameras.

How does the dual full-scale mode affect pressure data interpretation?

When FS_MODE = 0 (Mode 1), pressure is calculated as (24-bit register value) ÷ 4096 LSB/hPa, covering 260–1260 hPa with ±0.5 hPa absolute accuracy. When FS_MODE = 1 (Mode 2), division uses 2048 LSB/hPa for 260–4060 hPa range, with accuracy expressed as ±0.13–0.36% of measured pressure depending on subrange and temperature - enabling precise depth measurement down to ~300 m.

Can the metal lid (Pin 7) be left unconnected without compromising performance?

Yes - Pin 7 (PAD2LID) may be left electrically floating while still being soldered to the PCB for mechanical stability. ST recommends this configuration for EMI-sensitive applications where grounding the lid could introduce noise coupling. Floating operation maintains full water resistance and pressure accuracy; grounding is optional and used only when board-level shielding is required.

Does the LPS28DFWTR require external calibration after soldering?

No - the LPS28DFWTR embeds factory-trimmed calibration coefficients in non-volatile memory, automatically loaded at power-on. These include pressure and temperature offset/gain corrections, eliminating need for post-soldering calibration. Soldering drift is specified at ±0.5 hPa, and long-term stability is ±1 hPa/year - both guaranteed without user intervention.