STMicroelectronics LPS27HHWTR

Overview

LPS27HHWTR from STMicroelectronics is a MEMS absolute pressure sensor functioning as a digital barometer with water-resistant ceramic LGA package, 260–1260 hPa measurement range, ±0.5 hPa absolute accuracy, 24-bit output resolution, and configurable ODR up to 200 Hz-used in portable altimeters, GPS-assisted navigation, and weather station modules.

For engineers reviewing the LPS27HHWTR datasheet, LPS27HHWTR pinout, LPS27HHWTR application, or LPS27HHWTR equivalent, key selection considerations include its dual I²C/MIPI I3CSM/SPI interface support, embedded FIFO, low 4 μA current draw at 1 Hz, gel-protected sensing element, and guaranteed operation from –40 °C to +85 °C.

Technical Context

The LPS27HHWTR integrates a piezoresistive silicon membrane sensing element with on-chip analog front-end, 24-bit sigma-delta ADC, digital temperature compensation engine, and programmable low-pass filter (LPF) for noise reduction. Its architecture separates pressure and temperature signal paths before fused digital output generation.

It supports three concurrent digital interfaces-SPI (4- or 3-wire), I²C, and MIPI I3CSM-with mode selection via CS pin; interrupt logic includes Data-Ready, FIFO watermark, and pressure threshold triggers; all registers are memory-mapped and accessible via standardized read/write protocols per interface.

Key Specifications

Pinout & Package

The LPS27HHWTR is housed in a 10-pin ceramic land grid array (CCLGA-10L) package with metal lid and internal potting gel. The package features an open cavity for pressure access, grounded metal cap for ESD robustness, and RoHS-compliant ECOPACK finish.

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 LPS27HHWTR uniquely combines IPX8-level water resistance, 24-bit resolution with 0.7 Pa noise floor, triple-interface support, and embedded FIFO-making it optimal for battery-powered, environmentally exposed, and interrupt-driven embedded systems.

Availability

LPS27HHWTR is available at Aetrix Electronics and suitable for portable altimeters, GPS-assisted navigation modules, and weather station equipment requiring stable component supply across extended product lifecycles.

Supply support for LPS27HHWTR 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 specializing in MEMS, power management, microcontrollers, and automotive ICs-with manufacturing and R&D operations across Europe, Asia, and the Americas.

The LPS27HHWTR belongs to ST's high-reliability MEMS pressure sensor family, designed specifically for consumer and industrial applications demanding environmental resilience, low power, and multi-protocol interoperability in space-constrained designs.

FAQ

What is the maximum supported SPI clock frequency for reliable communication?

The LPS27HHWTR supports SPI clock frequencies up to 10 MHz under characterization conditions, but ST recommends ≤8 MHz for ODR settings above 50 Hz to ensure timing margin compliance. At 1–50 Hz ODR, 8 MHz SPI reliably delivers full 24-bit pressure and 16-bit temperature data without read errors or CRC mismatches.

How does the potting gel affect soldering and thermal performance?

The internal silicone-based potting gel is thermally stable up to 260 °C peak and compatible with standard lead-free reflow profiles (J-STD-020). It does not outgas or degrade during soldering, and its low thermal conductivity has negligible impact on junction-to-ambient thermal resistance-validated across –40 °C to +85 °C operation.

Can the LPS27HHWTR operate with only I²C and no SPI or MIPI I3CSM connections?

Yes-the device defaults to I²C mode when CS pin is held high. All I²C functionality-including register access, interrupt configuration, and FIFO control-is fully operational without connecting SPI or MIPI I3CSM lines. SDA, SCL, VDD, Vdd_IO, GND, and INT_DRDY are the only required connections for basic I²C operation.

What is the meaning of "LOW_NOISE_EN = 1" in the noise specification?

Setting LOW_NOISE_EN = 1 in CTRL_REG2 enables the internal low-noise analog path and activates the enhanced digital filtering chain, reducing RMS pressure noise from 0.025 hPa to 0.007 hPa (0.7 Pa). This mode increases current consumption from 4 μA to 12 μA at 1 Hz ODR but is essential for high-resolution altitude tracking.