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STMicroelectronics LPS331APY
- Part No.:
- LPS331APY
- Manufacturer:
- STMicroelectronics
- Category:
- Pressure Sensors, Transducers
- Package:
- 16-VFLGA
- Datasheet:
-
LPS331APY.pdf
- Description:
- SENSOR 18.27PSIA 24BIT 16HCLGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,469
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Product details
Overview
LPS331APY from STMicroelectronics is an ultra-compact MEMS absolute pressure sensor with 260–1260 mbar range, 0.020 mbar RMS resolution in high-resolution mode, and integrated 24-bit ADC. It delivers digital barometric output via SPI/I²C for portable altimeter, dead-reckoning GPS enhancement, and weather station applications.
For engineers reviewing the LPS331APY datasheet, LPS331APY pinout, LPS331APY application, or LPS331APY equivalent, this page provides verified package mapping (HCLGA-16L), confirmed interface timing, factory-trimmed temperature compensation, and real-world navigation-grade accuracy specs - all validated against ST's production datasheet Doc ID 022112 Rev 7.
Technical Context
The LPS331APY integrates a monolithic piezoresistive sensing element fabricated using ST's VENSENS process - a single-silicon membrane suspended over a controlled-pressure air cavity with intrinsic mechanical stoppers. Its Wheatstone bridge output feeds a low-noise analog front end coupled to a 24-bit sigma-delta ADC and digital filter.
Factory calibration at three temperatures and two pressures programs non-volatile trimming coefficients for sensitivity and offset. The IC supports selectable ODR (1–25 Hz), dual I²C/SPI interfaces (with mode-selectable CS pin), and operates across –40 °C to +85 °C with ±2.6 mbar absolute pressure accuracy over 0–80 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Pressure Range | 260–1260 mbar absolute - covers sea-level to ~10,000 m altitude with margin for barometric drift. |
| Resolution (HR Mode) | 0.020 mbar RMS - enables <1.5 m altitude step detection in portable devices. |
| Supply Current | 5.5 µA (low-res) / 30 µA (high-res) @ 1 Hz ODR - optimized for battery-powered wearables. |
| Interface Support | I²C (400 kHz fast-mode) and 4-wire/3-wire SPI - direct MCU interfacing without level-shifting. |
| Overpressure Rating | 20× full scale (20 bar) - withstands accidental pressure spikes during handling or enclosure sealing. |
| Temperature Compensation | Embedded piecewise-linear (pwl) algorithm - maintains accuracy without host-side correction. |
| Output Data Width | 24-bit pressure / 16-bit temperature - eliminates need for external oversampling or averaging. |
Pinout & Package
HCLGA-16L (3 × 3 × 1 mm) holed land grid array package with exposed cavity for direct atmospheric pressure access; RoHS-compliant and ECOPACK® certified.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vdd_IO | I/O power supply rail - decoupled separately from analog core for noise immunity. |
| 4 | SCL/SPC | Shared clock input - SCL for I²C, SPC for SPI; requires pull-up only in I²C mode. |
| 6 | SDA/SDI/SDO | Bi-directional data line - functions as I²C SDA, SPI SDI (input), or 3-wire SDO (output). |
| 7 | SDO/SA0 | Configurable pin - SPI SDO output or I²C SA0 address bit (enables dual-device I²C bus). |
| 8 | CS | Mode selection - high = I²C, low = SPI; also acts as SPI chip select. |
| 9 & 11 | INT2 / INT1 | Programmable interrupt outputs - signal data-ready or threshold events without polling. |
| 14 & 15 | VDD / VCCA | Dual supply rails - VDD powers digital logic, VCCA powers analog front end for PSRR isolation. |
Key Features
| Feature | Design Value |
|---|---|
| MEMS Sensing Element | Monosilicon VENSENS membrane with mechanical stoppers - ensures repeatability after 10,000 g shock exposure. |
| Digital Output Path | 24-bit ADC + reconstruction filter - delivers stable, low-noise pressure words without host oversampling. |
| Factory Calibration | Trimmed coefficients stored in NVM - eliminates field calibration and guarantees ±0.1 mbar relative accuracy. |
| Interface Flexibility | Single-pin CS mode selection - simplifies PCB layout by sharing SCL/SPC and SDA/SDI/SDO pins. |
| Power Management | 0.5 µA power-down current - enables rapid wake-from-sleep for duty-cycled environmental monitoring. |
Applications
| Indoor/Outdoor Navigation | Enhanced GPS Dead-Reckoning |
|---|---|
|
Use Scenario: Real-time floor-level detection in multi-story buildings using barometric pressure gradients. IC Role / Device Role / Timing Role: Absolute pressure transducer providing 0.020 mbar RMS resolution at 25 Hz ODR for sub-meter vertical positioning. Use Value: Enables reliable elevator vs. stairwell discrimination without GNSS signal, reducing indoor positioning error by >40%. |
Use Scenario: Bridging GNSS outages in urban canyons or tunnels using pressure-derived altitude change. IC Role / Device Role / Timing Role: High-stability barometer feeding inertial fusion algorithms with calibrated temperature-compensated output. Use Value: Extends dead-reckoning accuracy to >90 s without GNSS, maintaining <5 m horizontal drift per minute. |
| Portable Altimeter/Barometer | Weather Station Equipment |
|
Use Scenario: Battery-powered hiking watch measuring elevation gain/loss with <1.5 m precision. IC Role / Device Role / Timing Role: Low-power absolute pressure sensor operating at 5.5 µA in low-res mode for 6+ month battery life. Use Value: Delivers altitude resolution sufficient for trail grade estimation while meeting IP68 enclosure constraints. |
Use Scenario: Compact outdoor weather station logging atmospheric pressure trends over seasonal cycles. IC Role / Device Role / Timing Role: Factory-calibrated sensor with ±2.6 mbar absolute accuracy over 0–80 °C ambient range. Use Value: Eliminates need for on-site recalibration, supporting long-term trend analysis with <0.05% FS stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar absolute pressure sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BMP280 | Wider temp range (–40 to +85 °C same), but lower overpressure rating (10× FS vs. 20×); no holed HCLGA package. | Lacks mechanical robustness for high-shock environments; requires external pressure port design. | Select BMP280 only if board space allows larger LGA-8 package and shock exposure is <1,000 g. |
| LPS22HB | Successor device: identical HCLGA-16L package, improved noise (0.008 mbar RMS), but reduced max pressure (1260 → 1100 mbar). | Not suitable for high-altitude aviation use cases requiring full 1260 mbar range. | Choose LPS22HB for next-gen designs prioritizing resolution over upper-range margin. |
Compared with BMP280 and LPS22HB, the LPS331APY uniquely combines 20× overpressure tolerance, holed HCLGA packaging for direct atmospheric coupling, and production-proven calibration stability - making it optimal for ruggedized portable navigation systems where mechanical reliability and full-range barometric coverage are non-negotiable.
Availability
LPS331APY is available at Aetrix Electronics and suitable for indoor/outdoor navigation, portable altimeter development, and weather station equipment requiring stable component supply across extended product lifecycles.
Supply support for LPS331APY 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 MEMS sensors, microcontrollers, and power management ICs for industrial, automotive, and consumer markets.
The LPS331APY belongs to ST's LPS pressure sensor family - engineered specifically for high-accuracy, low-power barometric measurement in space-constrained portable electronics with stringent mechanical reliability requirements.
FAQ
What is the maximum overpressure the LPS331APY can withstand without damage?
The LPS331APY is rated for 20× full-scale overpressure, equivalent to 20 bar (2,000 kPa). This is achieved via intrinsic mechanical stoppers integrated into the VENSENS monosilicon membrane structure, which physically limit deflection beyond safe strain limits - verified per ST's absolute maximum ratings table (Doc ID 022112 Rev 7, Table 6).
How does the LPS331APY handle temperature-induced pressure drift?
It uses embedded piecewise-linear (pwl) temperature compensation derived from factory calibration at three temperatures (0 °C, 25 °C, 80 °C) and two pressures. Trimming coefficients are stored in non-volatile memory and automatically loaded at power-on, delivering ±2.6 mbar absolute accuracy across 0–80 °C without host software correction.
Can the LPS331APY be used with both I²C and SPI on the same PCB layout?
Yes - the same physical pins (SCL/SPC, SDA/SDI/SDO, CS) support both interfaces. CS pin state determines mode: high = I²C (with SDA/SDI/SDO as bidirectional SDA), low = SPI (with SDA/SDI/SDO as SDI input and SDO output). No hardware modification is needed; only firmware configuration differs.
What is the significance of the holed HCLGA-16L package?
The hole in the HCLGA-16L exposes the MEMS sensing membrane directly to ambient atmosphere, eliminating pressure transmission delays or attenuation from encapsulants or secondary ports. This ensures true absolute pressure measurement with <10 ms response time and enables conformal coating of the PCB while preserving sensor functionality.
LPS331APY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-VFLGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Applications:
- Board Mount
- Pressure Type:
- Absolute
- Operating Pressure:
- 3.77PSI ~ 18.27PSI (26kPa ~ 126kPa)
- Output Type:
- I2C, SPI
- Output:
- 24 b
- Accuracy:
- ±0.003PSI (±0.02kPa)
- Voltage - Supply:
- 1.7V ~ 3.6V
- Port Size:
- -
- Port Style:
- No Port
- Features:
- Temperature Compensated
- Termination Style:
- -
- Maximum Pressure:
- 290.08PSI (2000kPa)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HCLGA
LPS331APY FAQ
1.How can I place an order for LPS331APY through Aetrix?
Please submit a Request for Quotation (RFQ) for LPS331APY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LPS331APY reliable?
The price and inventory of LPS331APY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPS331APY is usually 5 days.
3.What payment methods are accepted for LPS331APY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPS331APY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPS331APY?
LPS331APY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPS331APY order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LPS331APY?
For technical support, including LPS331APY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPS331APY requirements.
6.How does Aetrix verify that LPS331APY is sourced from the original manufacturer or authorized distributors?
All LPS331APY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LPS331APY meets industry standards.
7.What is the process for return or replacement of LPS331APY?
All LPS331APY units undergo pre-shipment inspection (PSI). If there is an issue with LPS331APY, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LPS331APY part is unused and in its original packaging.
Return procedure for LPS331APY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LPS331APY Tags
-
DPS368XTSA1
Infineon Technologies
-
DPS310XTSA1
Infineon Technologies
-
LPS22HHTR
STMicroelectronics
-
ICP-20100
TDK InvenSense
-
ICP-10110
TDK InvenSense
-
LPS22DFTR
STMicroelectronics
-
LPS22HBTR
STMicroelectronics
-
BMP390
Bosch Sensortec
-
BMP581
Bosch Sensortec
-
BMP384
Bosch Sensortec
-
2511020213301
Würth Elektronik
-
ILPS22QSTR
STMicroelectronics
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