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STMicroelectronics LPS331APTR
- Part No.:
- LPS331APTR
- Manufacturer:
- STMicroelectronics
- Category:
- Pressure Sensors, Transducers
- Package:
- 16-VFLGA
- Datasheet:
-
LPS331APTR.pdf
- Description:
- SENSOR 18.27PSIA 24BIT 16HCLGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,983
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Product details
Overview
LPS331APTR 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 I²C or SPI for portable altimeter, GPS dead-reckoning, and weather station applications.
For engineers reviewing the LPS331APTR datasheet, LPS331APTR pinout, LPS331APTR application, or LPS331APTR equivalent, this device supports dual-interface communication, factory-trimmed temperature compensation, 1–25 Hz selectable ODR, 1.71–3.6 V supply, and operates across –40 °C to +85 °C in a 3 × 3 × 1 mm HCLGA-16L package.
Technical Context
The LPS331APTR 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.
The IC interface includes embedded piecewise-linear (PWL) temperature compensation, factory calibration at three temperatures and two pressures, and dual-mode serial control: I²C (400 kHz fast mode) with address-selectable SA0 pin, or SPI (3- or 4-wire) with auto-incrementing register access. Power modes range from 0.5 µA (power-down) to 30 µA (high-res mode).
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 m altitude step detection in portable navigation systems. |
| Supply Voltage | 1.71–3.6 V - compatible with single-cell Li-ion, coin cell, and 3.3 V logic rails without level shifting. |
| Output Data Rate | Selectable 1–25 Hz - balances power vs. responsiveness for battery-constrained wearables and IoT nodes. |
| Accuracy (Temp) | ±2.6 mbar over 0–80 °C - achieved via embedded PWL compensation, eliminating host-side calibration. |
| Overpressure Rating | 20× full scale (20 bar) - withstands transient pressure spikes during drop testing or rapid cabin pressurization. |
| Shock Survivability | 10,000 g - ensures reliability in handheld devices subjected to mechanical impact per MIL-STD-883H. |
Pinout & Package
HCLGA-16L (3 × 3 × 1 mm) holed land grid array package with exposed cavity for direct atmospheric pressure coupling; RoHS-compliant ECOPACK® construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 Vdd_IO | I/O power supply | Separate rail for digital interface logic-decoupled independently to suppress noise coupling into analog path. |
| 4 SCL/SPC | Serial clock input | Shared pin for I²C SCL or SPI SPC-mode selected by CS logic level; requires pull-up for I²C operation. |
| 6 SDA/SDI/SDO | Bidirectional data I/O | Tri-function pin: I²C data, SPI input, or 3-wire SPI output-enables compact PCB layout with minimal routing. |
| 7 SDO/SA0 | Slave address LSB / SPI output | Configures I²C address (B8h/B9h or BAh/BBh) when pulled high/low; doubles as SPI data output in 4-wire mode. |
| 8 CS | Interface mode select / SPI enable | High = I²C mode (requires external pull-up); Low = SPI active-no external mode resistor needed. |
| 9 & 11 INT1/INT2 | Programmable interrupt outputs | Support data-ready, FIFO threshold, or pressure-change alerts-reduces MCU polling overhead in low-power states. |
| 14 VDD | Analog core supply | Dedicated power domain for MEMS bias and ADC-separated from I/O to minimize switching noise injection. |
| 15 VCCA | Analog reference supply | Stabilizes internal reference for ADC conversion-must be decoupled with 100 nF ceramic capacitor near pad. |
Key Features
| Feature | Design Value |
|---|---|
| Embedded 24-bit ADC + digital filter | Delivers oversampled, noise-shaped pressure data with no external signal conditioning required. |
| Factory-trimmed PWL temperature compensation | Eliminates need for host MCU calibration routines-accuracy maintained across full operating temperature range. |
| Dual I²C/SPI interface with shared pins | Reduces PCB footprint and BOM count-supports legacy I²C designs and high-speed SPI protocols on same hardware. |
| Low-power high-resolution mode (30 µA @ 25 Hz) | Enables continuous barometric logging in fitness trackers with >1-week battery life on CR2032. |
| HCLGA-16L holed package (3 × 3 × 1 mm) | Minimizes board area while enabling direct atmospheric coupling-ideal for slim smartphones and smartwatches. |
Applications
| Indoor/Outdoor Navigation | Enhanced GPS Dead-Reckoning |
|---|---|
|
Use Scenario: Pedestrian navigation in urban canyons or multi-story buildings where GNSS signals are obstructed or multipath-distorted. IC Role / Device Role / Timing Role: Absolute pressure sensor providing vertical position updates between GNSS fixes via barometric altitude change detection. Use Value: Enables sub-floor-level indoor positioning accuracy (<3 m vertical error) without requiring WiFi or BLE infrastructure. |
Use Scenario: Vehicle navigation during tunnel passages or dense foliage where GPS signal loss exceeds 30 seconds. IC Role / Device Role / Timing Role: High-stability pressure reference feeding inertial fusion algorithms to constrain vertical drift of IMU-based dead reckoning. Use Value: Reduces cumulative altitude error from >50 m to <5 m over 2-minute GPS outage-critical for ADAS map-matching. |
| Portable Altimeter/Barometer | Weather Station Equipment |
|
Use Scenario: Real-time elevation tracking in hiking watches and aviation handhelds with automatic sea-level pressure compensation. IC Role / Device Role / Timing Role: Primary barometric transducer delivering calibrated digital pressure output at 10 Hz for real-time trend analysis. Use Value: Achieves ±0.1 mbar relative accuracy-sufficient for detecting 0.8 m altitude changes, meeting EN 13319 altimeter standards. |
Use Scenario: Networked environmental monitoring nodes deployed in agricultural fields or remote meteorological stations. IC Role / Device Role / Timing Role: Long-term stable pressure measurement node interfaced to LoRaWAN or NB-IoT modems for cloud telemetry. Use Value: Maintains ±2.6 mbar absolute accuracy over 0–80 °C without recalibration-reducing field maintenance cycles by >60%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar absolute pressure sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BMP280TR | Higher typical current (2.7 µA LP mode), no built-in temperature compensation algorithm; requires host-side calibration coefficients. | Lower cost point but increases firmware development effort for temperature compensation and pressure linearization. | Prefer when BOM cost dominates and MCU resources exist for calibration math. |
| LPS22HBTR | Improved accuracy (±0.02 mbar typ.), lower power (1.7 µA HR mode), but narrower pressure range (260–1260 mbar same) and identical HCLGA-10L footprint. | Drop-in replacement with enhanced resolution and lower quiescent current-ideal for next-gen wearable upgrades. | Choose for new designs targeting extended battery life and tighter altitude resolution. |
Compared with BMP280TR, LPS331APTR offers superior factory-calibrated accuracy and lower system-level integration effort; versus LPS22HBTR, it trades slightly higher power for proven long-term stability in industrial-grade deployments since 2012.
Availability
LPS331APTR is available at Aetrix Electronics and suitable for portable altimeters, GPS-assisted navigation systems, and weather station equipment requiring stable component supply across automotive-grade temperature ranges and multi-year production cycles.
Supply support for LPS331APTR 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, power management, microcontrollers, and automotive ICs with vertical manufacturing capability.
The LPS331APTR belongs to ST's high-precision MEMS pressure sensor product line, designed specifically for battery-powered consumer and industrial applications demanding ultra-low power, small form factor, and factory-calibrated accuracy without host-side compensation.
FAQ
What is the maximum overpressure the LPS331APTR can withstand without damage?
The LPS331APTR is rated for 20× full-scale overpressure, equivalent to 20 bar (2 MPa). This specification is validated per absolute maximum ratings in the datasheet and ensures mechanical integrity under transient events such as rapid cabin pressurization or mechanical shock-induced pressure spikes-no permanent performance degradation occurs below this limit.
Does the LPS331APTR require external calibration for temperature compensation?
No. The LPS331APTR embeds factory-programmed piecewise-linear (PWL) temperature compensation coefficients stored in non-volatile memory. At power-on, these values are loaded automatically into internal registers, enabling ±2.6 mbar absolute accuracy from 0 °C to 80 °C without any host MCU calibration routine or external lookup tables.
Can the LPS331APTR operate with a 1.8 V supply on both VDD and Vdd_IO?
Yes. The LPS331APTR supports supply voltages from 1.71 V to 3.6 V on both VDD (analog core) and Vdd_IO (digital I/O), including simultaneous 1.8 V operation. This allows direct interfacing with 1.8 V MCUs and eliminates level-shifting components in ultra-low-power designs.
How does the SA0 pin affect I²C addressing on the LPS331APTR?
The SA0 pin sets the least-significant bit of the 7-bit I²C slave address: tied to GND yields address 0xB8 (write)/0xB9 (read); tied to Vdd_IO yields 0xBA (write)/0xBB (read). This enables two LPS331APTR devices on the same I²C bus without address conflict-essential for differential pressure or redundant sensing configurations.
LPS331APTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-VFLGA
- Packaging:
- Tape & Reel (TR)
- 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:
- SMD (SMT) Tab
- Maximum Pressure:
- 290.08PSI (2000kPa)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HCLGA
LPS331APTR FAQ
1.How can I place an order for LPS331APTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LPS331APTR 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 LPS331APTR reliable?
The price and inventory of LPS331APTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPS331APTR is usually 5 days.
3.What payment methods are accepted for LPS331APTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPS331APTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPS331APTR?
LPS331APTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPS331APTR 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 LPS331APTR?
For technical support, including LPS331APTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPS331APTR requirements.
6.How does Aetrix verify that LPS331APTR is sourced from the original manufacturer or authorized distributors?
All LPS331APTR 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 LPS331APTR meets industry standards.
7.What is the process for return or replacement of LPS331APTR?
All LPS331APTR units undergo pre-shipment inspection (PSI). If there is an issue with LPS331APTR, 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 LPS331APTR part is unused and in its original packaging.
Return procedure for LPS331APTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LPS331APTR Tags
-
DPS368XTSA1
Infineon Technologies
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DPS310XTSA1
Infineon Technologies
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LPS22HHTR
STMicroelectronics
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ICP-20100
TDK InvenSense
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ICP-10110
TDK InvenSense
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LPS22DFTR
STMicroelectronics
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LPS22HBTR
STMicroelectronics
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BMP390
Bosch Sensortec
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BMP581
Bosch Sensortec
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BMP384
Bosch Sensortec
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2511020213301
Würth Elektronik
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ILPS22QSTR
STMicroelectronics
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