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STMicroelectronics ILPS28QSWTR
- Part No.:
- ILPS28QSWTR
- Manufacturer:
- STMicroelectronics
- Category:
- Pressure Sensors, Transducers
- Package:
- 6-CLGA Exposed Pad
- Datasheet:
-
ILPS28QSWTR.pdf
- Description:
- DUAL FULL-SCALE, 1260 HPA AND 40
- Quantity:
- Payment:
- Shipping:
Inventory:683
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Product details
Overview
ILPS28QSWTR from STMicroelectronics is a dual full-scale, water-resistant, piezoresistive absolute pressure sensor in CCLGA-7L package (2.8 × 2.8 × 1.95 mm), delivering 24-bit digital barometric output via I²C or MIPI I3CSM. It supports two selectable pressure ranges (260–1260 hPa and 260–4060 hPa), achieves ±0.5 hPa absolute accuracy at 25 °C, 0.32 Pa RMS noise, and operates across –40 to +105 °C - enabling high-reliability altimetry and leak detection in outdoor and medical ventilator systems.
For engineers reviewing the ILPS28QSWTR datasheet, ILPS28QSWTR pinout, ILPS28QSWTR application, or ILPS28QSWTR equivalent, this page delivers verified technical context on dual-mode pressure sensing, embedded Qvar charge variation detection, analog hub integration, FIFO buffering, and metal-lid grounding options - all critical for industrial metering, CPAP design, and man-down safety systems.
Technical Context
The ILPS28QSWTR integrates a MEMS piezoresistive Wheatstone bridge sensing element with a low-noise analog front-end, 24-bit ADC, and digital logic block featuring temperature-compensated pressure calculation, AVG filtering, and FIFO management. Its dual full-scale mode is selected via FS_MODE bit in CTRL_REG2 (11h), switching sensitivity between 4096 LSB/hPa (Mode 1) and 2048 LSB/hPa (Mode 2).
It embeds two functional channels beyond pressure: an analog hub (AH1/AH2) accepting external analog inputs, and Qvar for electric charge variation detection - both configurable via register writes and hardware pin states (pins 2 & 4). The device uses factory-trimmed non-volatile parameters for one-time calibration and outputs synchronized pressure/temperature data with programmable ODR (1–200 Hz) and interrupt-driven FIFO status reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Pressure Range Modes | Mode 1: 260–1260 hPa (e.g., barometric weather station); Mode 2: 260–4060 hPa (e.g., high-altitude altimeter or gas metering) |
| Absolute Accuracy | ±0.5 hPa at 25 °C (Mode 1, 800–1100 hPa); ±1 hPa/year long-term stability ensures calibration-free operation over 5-year product life |
| Pressure Noise | 0.32 Pa RMS (Mode 1, ODR=100 Hz, AVG=512) - enables sub-centimeter altitude resolution in drone or wearable applications |
| Output Resolution | 24-bit signed pressure data (two's complement), directly convertible to hPa using stored sensitivity values per mode |
| Interface Options | I²C (up to 1 MHz fast-mode plus) or MIPI I3CSM - supports multi-drop configurations and low-latency command-response timing |
| Power Consumption | 1.7 µA @ 1 Hz one-shot (pressure only); 4.2 µA with AH/Qvar enabled - extends battery life in portable environmental monitors |
| Operating Temperature | –40 to +105 °C - validated for CPAP machines, industrial water meters, and automotive under-hood barometric compensation |
Pinout & Package
The ILPS28QSWTR is housed in a ceramic column LGA (CCLGA-7L) package measuring 2.8 × 2.8 × 1.95 mm, featuring a hermetically sealed metal lid connected to Pin 7 (PAD2LID). The package includes internal potting gel rated for 10 ATM water resistance and chemical exposure (chlorine, detergents, fuels), with a holed ceramic base enabling external pressure access to the MEMS diaphragm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SDA | I²C/MIPI I3CSM serial data line | Open-drain bidirectional interface; requires external pull-up; supports fast-mode plus (1 MHz) timing |
| 2 AH1/QVAR1 | Analog hub input / Qvar charge-sensing channel 1 | Must be tied to GND if unused; when enabled, accepts ±18 mV differential input with 18 MΩ impedance (ODR/AVG dependent) |
| 3 SCL | I²C/MIPI I3CSM serial clock line | Input-only clock signal; Schmitt-triggered; compatible with standard I²C master timing |
| 4 AH2/QVAR2 | Analog hub input / Qvar charge-sensing channel 2 | Functionally identical to Pin 2; enables dual-electrode touch or differential leak detection |
| 5 GND | 0 V reference and return path | Primary ground connection; must be low-impedance; shares return with metal lid via Pin 7 if grounded |
| 6 VDD | Power supply input | 1.7–3.6 V operation; requires 100 nF decoupling capacitor placed adjacent to pin; optional 4.7 µF bulk cap recommended |
| 7 PAD2LID | Metal lid connection terminal | Internally bonded to lid; may be left floating or connected to PCB GND per EMI/noise requirements - not electrically active in sensing path |
Key Features
| Feature | Design Value |
|---|---|
| Dual full-scale pressure range selection | Hardware- and register-configurable (FS_MODE bit) - eliminates need for multiple BOM variants in multi-application designs |
| Embedded Qvar charge variation detection | Enables tap/double-tap, swipe, and water-leak detection without external ADC or comparator circuitry |
| 128-slot 24-bit FIFO buffer | Reduces host MCU polling overhead and system power by up to 70% in burst-read architectures (e.g., battery-powered weather stations) |
| Factory-trimmed temperature compensation | Eliminates field calibration; stores trimming coefficients in non-volatile memory; applies real-time correction across –40 to +105 °C |
| Water-resistant CCLGA package with O-ring seal | Validated to 10 ATM hydrostatic pressure; gel encapsulation resists chlorine, solvents, and humidity - suitable for IP67+ end equipment |
Applications
| Gas Metering | CPAP Ventilators |
|---|---|
|
Use Scenario: Measuring differential gas flow and tank pressure in smart utility meters exposed to outdoor temperature swings and moisture. IC Role / Device Role / Timing Role: Absolute pressure sensor providing compensated barometric reference for flow calculation and leak detection via Qvar channel. Use Value: ±0.5 hPa accuracy and –40 to +105 °C operation ensure metrology-grade readings across seasonal extremes without recalibration. |
Use Scenario: Monitoring airway pressure and detecting mask disconnection or patient apnea events in portable CPAP devices. IC Role / Device Role / Timing Role: Primary pressure transducer with 200 Hz ODR and FIFO buffering; Qvar detects subtle airflow-induced charge shifts during breathing cycles. Use Value: 0.32 Pa RMS noise enables <1 cmH₂O resolution - critical for responsive pressure support and patient comfort compliance. |
| Outdoor Altimeters | Man-Down Safety Systems |
|
Use Scenario: Altitude tracking in ruggedized wearables or UAVs operating at high elevations and variable ambient conditions. IC Role / Device Role / Timing Role: Dual-mode barometer selecting 4060 hPa full scale for >3000 m elevation; temperature-compensated output fed to Kalman filter. Use Value: Extended 260–4060 hPa range covers sea level to Mount Everest summit; long-term drift <±1 hPa/year maintains GPS-independent height accuracy. |
Use Scenario: Detecting sudden posture change or impact-induced pressure shift in industrial worker safety tags. IC Role / Device Role / Timing Role: Qvar channel senses rapid capacitance change from body impact or fall; pressure channel confirms immobility via static pressure signature. Use Value: Combined Qvar + pressure event detection reduces false alarms vs. accelerometer-only solutions; operates reliably in dusty/wet environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar absolute pressure sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BMP581 (Bosch) | Single full-scale (30–110 kPa); no Qvar or analog hub; lower noise (0.15 Pa), but no water-resistant package | Lacks dual-range flexibility and integrated charge sensing - unsuitable for leak/tap detection or high-pressure gas metering | Select BMP581 only for ultra-low-noise indoor barometry where package sealing and multi-functionality are not required |
| LPS22HB (STMicroelectronics) | Same CCLGA-7L package; single 260–1260 hPa range; no Qvar/AH; higher current (3.5 µA @ 1 Hz); lacks FIFO | No charge variation detection or analog input capability; limited to basic barometric use cases | Choose LPS22HB for cost-sensitive, space-constrained designs needing only baseline pressure sensing without advanced features |
Compared with BMP581 and LPS22HB, the ILPS28QSWTR uniquely combines dual full-scale pressure measurement, embedded Qvar, analog hub, and industrial-grade water resistance - making it the only option among the three for CPAP, gas metering, and man-down systems requiring multi-signal integrity in harsh environments.
Availability
ILPS28QSWTR is available at Aetrix Electronics and suitable for gas metering, CPAP ventilator development, outdoor altimeter production, and industrial man-down safety systems requiring stable component supply, long-term calibration stability, and certified water resistance.
Supply support for ILPS28QSWTR 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 automotive-grade components with ISO/TS 16949 and ISO 14001 certification.
The ILPS28QSWTR belongs to ST's high-accuracy MEMS pressure sensor family, engineered specifically for industrial and medical applications demanding robust environmental resilience, multi-function integration, and long-term metrological stability without field recalibration.
FAQ
How is the metal lid (Pin 7) intended to be used in PCB layout?
Pin 7 (PAD2LID) provides a dedicated solderable connection to the internal metal lid. It may be left electrically floating or connected to PCB ground depending on EMI requirements and mechanical mounting constraints. Grounding improves shielding against RF interference but is not required for basic pressure functionality. The lid itself is not part of the sensing path.
What configuration is required to enable the Qvar function for water-leak detection?
To enable Qvar, write 0x01 to register 5Fh (QVAR_CTRL), configure pins 2 (AH1/QVAR1) and 4 (AH2/QVAR2) with external electrodes per Figure 15, and set appropriate gain/averaging in QVAR_CFG (5Eh). The device then outputs raw charge-difference data; threshold-based leak detection logic must be implemented in the host MCU using FIFO or interrupt-driven reads.
Does the ILPS28QSWTR require external calibration after soldering?
No. Factory-trimmed compensation parameters are stored in non-volatile memory and automatically loaded at power-on. The device delivers calibrated pressure and temperature outputs without user intervention. Soldering drift is specified at ±0.5 hPa and is included in the total accuracy budget across temperature and time.
Can both pressure and Qvar channels operate simultaneously at maximum ODR?
No. At 200 Hz ODR, Qvar sampling is disabled when pressure acquisition is active. The device prioritizes pressure data integrity; Qvar operates at reduced effective rate (typically ≤50 Hz) when both functions are enabled. For full-rate concurrent operation, use separate timing windows or lower ODR settings per application requirements.
ILPS28QSWTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 6-CLGA Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Board Mount
- Pressure Type:
- Absolute
- Operating Pressure:
- 3.77PSI ~ 58.89PSI (26kPa ~ 406kPa)
- Output Type:
- I2C, I3C
- Output:
- 24 b
- Accuracy:
- ±0.007PSI (±0.05kPa)
- Voltage - Supply:
- 1.7V ~ 3.6V
- Port Size:
- -
- Port Style:
- No Port
- Features:
- Temperature Compensated
- Termination Style:
- -
- Maximum Pressure:
- 145PSI (999.74kPa)
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-CCLGA (2.8x2.8)
ILPS28QSWTR FAQ
1.How can I place an order for ILPS28QSWTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ILPS28QSWTR 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 ILPS28QSWTR reliable?
The price and inventory of ILPS28QSWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ILPS28QSWTR is usually 5 days.
3.What payment methods are accepted for ILPS28QSWTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ILPS28QSWTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ILPS28QSWTR?
ILPS28QSWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ILPS28QSWTR 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 ILPS28QSWTR?
For technical support, including ILPS28QSWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ILPS28QSWTR requirements.
6.How does Aetrix verify that ILPS28QSWTR is sourced from the original manufacturer or authorized distributors?
All ILPS28QSWTR 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 ILPS28QSWTR meets industry standards.
7.What is the process for return or replacement of ILPS28QSWTR?
All ILPS28QSWTR units undergo pre-shipment inspection (PSI). If there is an issue with ILPS28QSWTR, 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 ILPS28QSWTR part is unused and in its original packaging.
Return procedure for ILPS28QSWTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ILPS28QSWTR 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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