STMicroelectronics ILPS22QSTR

Overview

ILPS22QSTR from STMicroelectronics is an ultracompact piezoresistive absolute pressure sensor delivering 24-bit digital barometric output via I²C, SPI, or MIPI I3CSM interfaces. It supports dual full-scale ranges (260–1260 hPa and 260–4060 hPa), achieves ±0.5 hPa absolute accuracy in Mode 1, operates from −40°C to +105°C, and consumes as low as 1.8 µA at 1 Hz - enabling high-precision industrial and medical pressure sensing in space-constrained designs.

For engineers reviewing the ILPS22QSTR datasheet, ILPS22QSTR pinout, ILPS22QSTR application, or ILPS22QSTR equivalent, key selection criteria include its embedded Qvar electrostatic sensing channel, analog hub for external analog input processing, FIFO-based burst-read capability, and HLGA-10L package with holed cavity for direct pressure access - all critical for altimeter, CPAP, and leak-detection systems requiring low-noise, low-power, and multi-function integration.

Technical Context

The ILPS22QSTR integrates a MEMS piezoresistive sensing element with a dedicated analog front-end, 24-bit ADC, and digital logic block supporting configurable ODR (1–200 Hz), AVG filtering, and temperature-compensated pressure calculation. Its architecture includes separate signal paths for pressure, temperature, analog hub (AH1/AH2), and Qvar charge-variation detection - each with independent gain, offset, and noise management.

Communication is handled through three concurrent interface modes: I²C fast mode (up to 400 kHz), SPI slave (up to 10 MHz), and MIPI I3CSM; mode selection is controlled by CS pin state and register configuration. The device uses factory-trimmed non-volatile parameters for on-chip compensation, eliminating system-level calibration for pressure and temperature outputs.

Key Specifications

Pinout & Package

HLGA-10L (2.0 mm × 2.0 mm × 0.73 mm) full-mold holed land grid array package; bottom-side exposed cavity allows external pressure to act directly on the MEMS sensing membrane. Pins are arranged in a 2×5 grid (bottom view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BMP580 and LPS22HH, the ILPS22QSTR uniquely integrates Qvar and analog hub functions alongside pressure/temperature sensing - making it the only option among the three for single-chip solutions combining barometric measurement with capacitive gesture or analog sensor interfacing.

Availability

ILPS22QSTR is available at Aetrix Electronics and suitable for industrial gas metering, CPAP ventilator pressure control, outdoor weather station deployment, and smart water leak detection requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for ILPS22QSTR 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 ILPS22QSTR belongs to ST's high-precision MEMS pressure sensor product line, engineered specifically for applications demanding integrated pressure, temperature, electrostatic, and analog signal acquisition in ultra-small form factors.

FAQ

What is the maximum overpressure the ILPS22QSTR can withstand without damage?

The ILPS22QSTR has an absolute maximum overpressure rating of 2 MPa (20 bar), as specified in Table 10 of DS13431. This rating applies to short-duration mechanical stress; sustained exposure above 4060 hPa (0.406 MPa) may affect long-term accuracy but will not cause immediate failure. The holed HLGA package is designed to equalize internal and external pressure rapidly, enhancing robustness against transient spikes.

How does the Qvar channel function in water leak detection?

The Qvar channel measures minute capacitance changes between two external electrodes connected to pins AH1/QVAR1 and AH2/QVAR2. When water bridges the electrodes, capacitance increases by ~0.5–5 pF, generating a measurable voltage shift amplified by the 438k LSB/mV gain. The device triggers an interrupt when this shift exceeds a user-defined threshold stored in QVAR_THS (5Ch), enabling immediate system response without host polling.

Can the ILPS22QSTR operate with a 1.2 V I/O supply?

Yes - the Vdd_IO pin supports 1.08 V to 3.6 V, explicitly including 1.2 V operation. DC input characteristics (Table 7) confirm VIH = 0.8 × Vdd_IO and VIL = 0.2 × Vdd_IO at 1.2 V, ensuring reliable logic-level recognition. All digital interfaces (I²C, SPI, I3CSM) function fully at 1.2 V, making the device compatible with ultra-low-voltage microcontrollers and energy-harvesting systems.

What FIFO mode is recommended for battery-powered weather stations?

For battery-powered weather stations, bypass-to-FIFO mode (FIFO_CTRL = 101b) is recommended. It keeps the FIFO empty until a data-ready interrupt occurs (e.g., every 10 minutes), then captures a burst of 16–32 samples before host readout. This minimizes average current by avoiding continuous sampling while preserving temporal resolution for trend analysis - achieving optimal trade-off between power and data fidelity.