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STMicroelectronics LPS35HWTR
- Part No.:
- LPS35HWTR
- Manufacturer:
- STMicroelectronics
- Category:
- Pressure Sensors, Transducers
- Package:
- 10-FCLGA
- Datasheet:
-
LPS35HWTR.pdf
- Description:
- SENSOR 18.27PSIA 24BIT 10CCLGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,072
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Product details
Overview
LPS35HWTR from STMicroelectronics is an ultra-compact MEMS absolute pressure sensor with water-resistant ceramic LGA package, delivering 24-bit digital pressure output (260–1260 hPa range), 16-bit temperature output, and dual SPI/I²C interfaces. It features embedded temperature compensation, 75 Hz max ODR, 3 µA typical current at 1 Hz, and 20× overpressure tolerance - deployed in wearable altimeters and GPS-assisted navigation systems.
For engineers reviewing the LPS35HWTR datasheet, LPS35HWTR pinout, LPS35HWTR application, or LPS35HWTR equivalent, key selection criteria include its holed CCLGA-10L package for direct environmental exposure, interrupt-driven FIFO operation, low-power pressure threshold detection, and factory-calibrated accuracy across –40 °C to +85 °C.
Technical Context
The LPS35HWTR integrates a piezoresistive sensing membrane with a dedicated ASIC that performs analog-to-digital conversion, quadratic temperature compensation, and digital filtering. Its 32-sample FIFO supports six operational modes including Stream, Dynamic-Stream, and Stream-to-FIFO, enabling flexible data buffering without host intervention.
Communication is handled via configurable I²C (standard/fast mode) or SPI (3-/4-wire), with CS pin selecting interface mode and SA0/SDO sharing pin 5 for I²C address LSB or SPI output. Interrupts (INT_DRDY) signal data readiness, FIFO status, and programmable pressure thresholds using registers INTERRUPT_CFG and THS_P_L/H.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Pressure Range | 260–1260 hPa absolute - covers sea-level barometric monitoring through high-altitude altimetry (≈−500 m to +12,000 m). |
| Output Resolution | 24-bit pressure / 16-bit temperature - enables ±0.004 hPa LSB step size for sub-meter altitude resolution. |
| Current Consumption | 3 µA at 1 Hz ODR (low-power mode) - extends battery life in wearables and portable weather stations. |
| Overpressure Tolerance | 20× full scale (≥25,200 hPa) - withstands mechanical shock and transient pressure spikes without damage. |
| Interface Support | SPI (10 MHz max) and I²C (up to 400 kHz) - allows integration into resource-constrained microcontrollers with minimal GPIO overhead. |
| Operating Temp | –40 °C to +85 °C - validated for industrial-grade deployment in outdoor and automotive-adjacent environments. |
| FIFO Depth | 32-sample buffer - reduces host polling frequency and enables burst-read efficiency in motion-aware applications. |
Pinout & Package
The LPS35HWTR is housed in a holed ceramic cavity LGA package (CCLGA-10L, 3.5 × 3.5 × 1.85 mm), designed to expose the sensing membrane directly to ambient pressure while maintaining IP54-equivalent water resistance per ST's mechanical validation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 Vdd_IO | I/O power supply | Separate 1.7–3.6 V rail for digital interface logic - isolates noise-sensitive analog core (VDD) from communication transceivers. |
| 2 SCL/SPC | Shared clock input | Dual-function pin: I²C serial clock or SPI serial port clock - mode selected by CS state and internal logic. |
| 3 Reserved | Internal test pad | Must be connected to GND - no user functionality; ensures proper internal biasing and ESD protection. |
| 4 SDA/SDI/SDO | Data bidirectional I/O | I²C data line or SPI input (SDI); in 3-wire SPI, functions as shared input/output - requires external pull-up for I²C. |
| 5 SDO/SA0 | Output or address bit | SPI data output (SDO) or I²C device address LSB (SA0) - determines I²C address (0x5C or 0x5D) when CS = 1. |
| 6 CS | Interface select & enable | Low = SPI active; High = I²C active - also serves as chip select for SPI read/write cycles. |
| 7 INT_DRDY | Interrupt/data-ready output | Open-drain output signaling new pressure/temperature data, FIFO flags, or threshold events - configurable via INTERRUPT_CFG register. |
| 8 & 9 GND | Ground reference | Dual ground terminals reduce impedance path for analog and digital return currents - critical for noise immunity in low-signal MEMS sensing. |
| 10 VDD | Analog core supply | 1.7–3.6 V supply for sensing element and ADC - decoupling near this pin minimizes pressure measurement drift. |
Key Features
| Feature | Design Value |
|---|---|
| Water-resistant CCLGA package | Holed ceramic lid enables direct atmospheric coupling while resisting moisture ingress - validated per ST's internal IP54-equivalent testing. |
| Embedded temperature compensation | Quadratic algorithm applied in real time - eliminates need for external calibration or host-side correction across 0–65 °C full-accuracy range. |
| Programmable pressure thresholds | Configurable high/low limits via THS_P_L/H registers - triggers INT_DRDY without host polling, reducing system wake-ups. |
| Multi-mode FIFO | 6 operational modes (Bypass, Stream, FIFO, etc.) - allows trade-off between latency, power, and host processing load in dynamic motion contexts. |
| Factory-trimmed sensitivity | Psens = 4096 LSB/hPa (typical) - guarantees consistent pressure-to-digital scaling across units without per-device calibration. |
Applications
| Wearable Altimeter | GPS-Assisted Navigation |
|---|---|
|
Use Scenario: Real-time elevation tracking in smartwatches and fitness bands during hiking or cycling. IC Role / Device Role / Timing Role: Absolute pressure sensor providing altitude delta updates at 25 Hz ODR with <10 ms latency. Use Value: Enables vertical position refinement where GPS vertical accuracy degrades (>10× improvement vs. standalone GPS). |
Use Scenario: Indoor/outdoor transition assistance in automotive infotainment and handheld navigation devices. IC Role / Device Role / Timing Role: Barometric aid for rapid GPS lock acquisition and floor-level discrimination in multi-story buildings. Use Value: Reduces time-to-first-fix (TTFF) by >40% and improves vertical positioning confidence in urban canyons. |
| Portable Weather Station | Drone Flight Controller |
|
Use Scenario: Battery-powered environmental monitoring nodes deployed in remote agricultural or ecological sites. IC Role / Device Role / Timing Role: Low-power barometer logging pressure trends every 60 s with FIFO-triggered wake-up. Use Value: Achieves >1-year battery life on coin cell using 3 µA standby current and programmable interrupt thresholds. |
Use Scenario: Closed-loop altitude hold in consumer and prosumer UAVs during autonomous flight. IC Role / Device Role / Timing Role: Primary pressure-based height sensor feeding PID controller at 75 Hz with FIFO-burst reads. Use Value: Delivers ±0.5 m altitude stability under wind gusts, leveraging 20× overpressure tolerance for robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar absolute pressure sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BMP388 (Bosch) | Higher pressure accuracy (±0.08 hPa), lower current (2.7 µA), but no water-resistant package - requires external sealing. | Preferred for precision indoor air quality monitors where environmental sealing is already implemented. | Select BMP388 if absolute accuracy and lowest power dominate; accept added mechanical integration effort. |
| MS5637 (TE Connectivity) | 24-bit output, 10–1200 hPa range, but only I²C interface and no FIFO - relies on continuous polling. | Suitable for simple barometric logging in cost-sensitive IoT endpoints with fixed firmware. | Choose MS5637 for legacy I²C-only designs lacking SPI capability or needing minimal BOM count. |
Compared with BMP388 and MS5637, the LPS35HWTR uniquely combines water resistance, dual-interface flexibility, and hardware FIFO - making it optimal for space-constrained, battery-powered systems requiring robust environmental operation and interrupt-driven efficiency.
Availability
LPS35HWTR is available at Aetrix Electronics and suitable for wearable devices, portable weather stations, and drone flight controllers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LPS35HWTR 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, designing and manufacturing MEMS sensors, microcontrollers, and power management ICs for industrial, automotive, and consumer markets.
The LPS35HWTR belongs to ST's high-reliability MEMS pressure sensor family, engineered specifically for compact, battery-operated systems demanding environmental resilience, low power, and seamless digital integration.
FAQ
What is the maximum operating temperature for the LPS35HWTR?
The LPS35HWTR is fully specified and guaranteed over –40 °C to +85 °C. Full accuracy for pressure (±1 hPa) is maintained from 0 °C to +65 °C after one-point calibration (OPC), while extended operation up to +85 °C retains functional integrity with calibrated drift compensation.
Does the LPS35HWTR require external calibration for accurate pressure readings?
No external calibration is required. The device includes factory-trimmed coefficients and on-chip quadratic temperature compensation. One-point calibration (OPC) at a known pressure improves absolute accuracy to ±1 hPa across 0–65 °C, but default operation achieves ±4 hPa without OPC.
How does the holed CCLGA-10L package affect PCB layout?
The package features an open cavity beneath the die; the PCB must include a pressure access hole aligned under the sensor footprint. ST recommends a minimum 1.2 mm diameter vent hole with smooth edges and no solder mask coverage to ensure unobstructed atmospheric coupling and avoid measurement hysteresis.
Can the LPS35HWTR operate in both SPI and I²C modes simultaneously?
No - interface mode is mutually exclusive and controlled by the CS pin state. When CS = 1, I²C is enabled and SPI is disabled; when CS = 0, SPI is active and I²C is disabled. Pin 5 (SDO/SA0) serves as either SPI output or I²C address bit depending on this mode selection.
LPS35HWTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 10-FCLGA
- 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:
- ±1%
- Voltage - Supply:
- 1.7V ~ 3.6V
- Port Size:
- -
- Port Style:
- No Port
- Features:
- Temperature Compensated
- Termination Style:
- SMD (SMT) Tab
- Maximum Pressure:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-CCLGA (3.5x3.5)
LPS35HWTR FAQ
1.How can I place an order for LPS35HWTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LPS35HWTR 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 LPS35HWTR reliable?
The price and inventory of LPS35HWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPS35HWTR is usually 5 days.
3.What payment methods are accepted for LPS35HWTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPS35HWTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPS35HWTR?
LPS35HWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPS35HWTR 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 LPS35HWTR?
For technical support, including LPS35HWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPS35HWTR requirements.
6.How does Aetrix verify that LPS35HWTR is sourced from the original manufacturer or authorized distributors?
All LPS35HWTR 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 LPS35HWTR meets industry standards.
7.What is the process for return or replacement of LPS35HWTR?
All LPS35HWTR units undergo pre-shipment inspection (PSI). If there is an issue with LPS35HWTR, 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 LPS35HWTR part is unused and in its original packaging.
Return procedure for LPS35HWTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LPS35HWTR Tags
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DPS368XTSA1
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DPS310XTSA1
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LPS22HHTR
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ICP-20100
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ICP-10110
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LPS22DFTR
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LPS22HBTR
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BMP390
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BMP581
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BMP384
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2511020213301
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