STMicroelectronics LPS22DFTR

Overview

LPS22DFTR from STMicroelectronics is an ultracompact, piezoresistive absolute pressure sensor delivering 24-bit digital barometric output with ±0.2 hPa absolute accuracy over 260–1260 hPa range, 0.34 Pa RMS noise, and 1.7 μA supply current at 1 Hz ODR. It operates from -40°C to +85°C in a holed HLGA-10L (2.0 × 2.0 × 0.73 mm) package and serves as a primary pressure sensing element in portable altimeters, drone flight controllers, and weather station front-ends.

For engineers reviewing the LPS22DFTR datasheet, LPS22DFTR pinout, LPS22DFTR application, or LPS22DFTR equivalent, key selection criteria include its dual-voltage I/O support (1.08–3.6 V), embedded FIFO with six configurable modes, soldering drift tolerance of ±0.15 hPa, and triple-interface compatibility (I²C / SPI / MIPI I3CSM) for low-power embedded systems integration.

Technical Context

The LPS22DFTR integrates a MEMS silicon membrane with dedicated piezoresistive Wheatstone bridge structure, isolated by a silicon spring frame to suppress thermal and mechanical stress. Its analog front-end includes low-noise amplification and 24-bit ADC conversion, followed by on-chip temperature compensation using factory-trimmed coefficients stored in nonvolatile memory.

Digital logic implements programmable output data rates (1–200 Hz), pressure/temperature averaging filters, FIFO buffering (128 × 24-bit slots), and interrupt generation (data-ready, FIFO threshold, pressure thresholds). Interface selection is controlled via CS pin state, enabling seamless mode switching between I²C, 4-wire SPI, and 3-wire SPI without hardware reconfiguration.

Key Specifications

Pinout & Package

Package: HLGA-10L (2.0 mm × 2.0 mm × 0.73 mm), holed full-mold land grid array with exposed cavity for ambient pressure access. RoHS-compliant and ECOPACK certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BMP388 and MS5637, the LPS22DFTR uniquely combines MIPI I3CSM compatibility, soldering drift tolerance (±0.15 hPa), and six-mode FIFO-making it optimal for next-gen wearable and drone platforms demanding interface flexibility and robust calibration retention.

Availability

LPS22DFTR is available at Aetrix Electronics and suitable for portable altimeters, drone flight controllers, and weather station equipment requiring stable component supply, long-lifecycle support, and guaranteed ECOPACK-compliant sourcing.

Supply support for LPS22DFTR 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, Switzerland, designing and manufacturing microcontrollers, sensors, power ICs, and analog components for industrial, automotive, and consumer markets.

The LPS22DFTR belongs to ST's nano-pressure MEMS sensor family, engineered specifically for ultra-low-power, high-accuracy barometric sensing in space-constrained portable and aerial platforms.

FAQ

What is the maximum supported output data rate (ODR) for pressure measurements?

The LPS22DFTR supports pressure output data rates from 1 Hz to 200 Hz, selectable via ODR[3:0] bits in CTRL_REG1 (10h). At 200 Hz, the device delivers 24-bit pressure samples every 5 ms with full temperature compensation and FIFO buffering enabled.

How does the holed HLGA package affect PCB layout and sealing requirements?

The HLGA-10L package features a bottom cavity hole exposing the MEMS membrane directly to ambient pressure. The PCB must include a pressure-access opening aligned under the cavity, and conformal coating or potting must avoid sealing this aperture to maintain measurement integrity.

Can the LPS22DFTR operate with separate VDD and Vdd_IO supplies?

Yes-VDD (1.7–3.6 V) powers the analog sensing core and ADC, while Vdd_IO (1.08–3.6 V) powers digital I/O. They may be supplied independently; recommended practice uses separate 100 nF decoupling capacitors on each rail near their respective pins.

What interrupt sources can be routed to the INT_DRDY pin?

The INT_DRDY pin supports data-ready indication, FIFO threshold alerts (FIFO_WTM_IA), FIFO overrun detection (FIFO_OVR_IA), and programmable pressure threshold events-all configured via CTRL_REG3 (12h) and INTERRUPT_CFG (0Bh) registers.