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STMicroelectronics LIS331AL
- Part No.:
- LIS331AL
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 16-VFLGA
- Datasheet:
-
LIS331AL.pdf
- Description:
- ACCELEROMETER TRIPLE AXIS 16LGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,660
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Product details
Overview
LIS331AL from STMicroelectronics is a MEMS-based 3-axis analog-output accelerometer with ±2g full-scale range, ratiometric output (sensitivity = 0.145×VDD V/g), factory-trimmed offset and sensitivity, and embedded self-test functionality. It operates from 3.0–3.6 V, delivers X/Y/Z analog outputs via high-impedance (32 kΩ) buffered pins, and supports bandwidths up to 2.0 kHz-used in mobile terminals for tilt sensing and motion-triggered UI response.
For engineers reviewing the LIS331AL datasheet, LIS331AL pinout, LIS331AL application, or LIS331AL equivalent, key selection criteria include its ratiometric analog output architecture, LGA-16 mechanical robustness (10,000g shock survivability), extended temperature operation (−40°C to +85°C), and self-test validation capability for field-deployed inertial systems.
Technical Context
The LIS331AL integrates a surface-micromachined capacitive sensing element with a fully differential CMOS interface featuring Correlated Double Sampling (CDS) to suppress 1/f noise and offset drift. Its output stage uses three independent sample-and-hold circuits to deliver single-ended analog voltages (Voutx/Vouty/Voutz) referenced to VDD/2.
All analog parameters-including zero-g level (±6% of VDD/2) and sensitivity (±5% tolerance)-are ratiometric to supply voltage, enabling direct interfacing with ADCs without external reference scaling. Bandwidth is externally programmable via load capacitance (Cload) on each output, with cutoff governed by ft ≈ 5 µF / Cload (Hz), using the internal 32 kΩ output impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-scale range | ±2.0 g - defines maximum measurable static/dynamic acceleration without saturation |
| Sensitivity | 0.145 × VDD V/g (±5%) - output changes linearly with supply; enables ratiometric ADC conversion |
| Zero-g output | VDD/2 ± 6% - nominal mid-supply DC level at 0g; shifts <0.5 mg/°C over temperature |
| Bandwidth | DC to 2.0 kHz - maximum usable signal frequency; reduced via external Cload (min 2.5 nF) |
| Supply current | 0.65 mA (active), 1 µA (power-down) - enables low-power motion wake-up in battery devices |
| Self-test output shift | +150 mV per axis - electrostatic actuation simulates known acceleration for system-level validation |
| Shock survivability | 10,000 g for 0.1 ms - ensures reliability in drop-prone consumer handhelds |
Pinout & Package
LIS331AL is housed in a 3 mm × 3 mm × 1.0 mm Land Grid Array (LGA-16) package with exposed die pad, compliant with ECOPACK® lead-free standards and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 15 | res (reserved) | Internally connected to VDD; must be tied to power supply for proper biasing |
| 3, 7, 8, 10, 12, 14 | NC (not connected) | No internal connection; leave floating or ground per PCB layout best practice |
| 4 | ST (Self-Test) | Logic high (≥2.0 V) activates electrostatic test force; logic low (≤0.8 V) enables normal operation |
| 5 | PD (Power Down) | Logic high disables analog output and reduces current to 1 µA; logic low enables active measurement |
| 6 | GND | Analog ground reference for all internal circuitry and output stages |
| 9, 11, 13 | Voutz / Vouty / Voutx | Analog voltage outputs for Z/Y/X axes; each has 32 kΩ source impedance for RC filtering |
| 16 | VDD | Main supply input (3.0–3.6 V); powers sensing element and interface IC |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric analog output | Output offset and sensitivity scale linearly with VDD, eliminating need for external voltage reference in ADC chains |
| Factory-trimmed calibration | Non-volatile storage of sensitivity and zero-g trim values enables plug-and-play use without user calibration |
| Embedded self-test | On-chip electrostatic actuation verifies mechanical integrity and signal path continuity without external stimulus |
| Low-noise CDS architecture | Correlated Double Sampling cancels 1/f noise and offset drift, achieving 300 µg/√Hz noise density |
| Configurable bandwidth | External capacitor on each output sets anti-aliasing cutoff from 1 Hz to 2 kHz, optimizing SNR per application |
Applications
| Mobile Tilt Sensing | Gaming Motion Input |
|---|---|
Use Scenario: Detecting device orientation (portrait/landscape) and rotation in smartphones and tablets. IC Role / Device Role / Timing Role: Analog 3-axis acceleration sensor providing real-time DC-coupled g-force data for UI reorientation. Use Value: Ratiometric output ensures consistent tilt accuracy across battery voltage decay; 2 kHz bandwidth captures fast gestures. |
Use Scenario: Translating handheld controller movement into game character motion in console peripherals. IC Role / Device Role / Timing Role: Low-latency analog motion transducer feeding microcontroller ADC for real-time gesture decoding. Use Value: Embedded self-test validates sensor health before gameplay; 10,000g shock rating survives aggressive handling. |
| Appliance Vibration Monitoring | Anti-Theft Tilt Detection |
Use Scenario: Measuring drum imbalance and spin vibration in washing machines to adjust motor speed. IC Role / Device Role / Timing Role: High-reliability analog accelerometer monitoring low-frequency mechanical oscillation (0.1–50 Hz). Use Value: External Cload allows precise 10–50 Hz low-pass filtering to reject motor noise while preserving fault signatures. |
Use Scenario: Triggering alarm when a secured asset (e.g., laptop, display) is lifted or tilted beyond threshold. IC Role / Device Role / Timing Role: Always-on motion detector operating in ultra-low-power mode (1 µA) with wake-on-tilt capability. Use Value: Power-down mode enables years of battery life; factory-trimmed offset ensures stable 0g reference over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis analog accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL335 | Wider supply range (1.8–3.6 V); higher noise density (300–500 µg/√Hz); no embedded self-test | Preferred where wider VDD flexibility matters more than built-in diagnostics | Select ADXL335 only if self-test is unnecessary and supply voltage may dip below 3.0 V |
| LIS344ALH | Digital I²C/SPI output; lower power (350 µA active); ±2g/±6g selectable range; same LGA-16 footprint | Used where microcontroller already handles digital comms and firmware-based calibration is acceptable | Choose LIS344ALH when migrating to digital interface or requiring multi-range configurability |
Compared with ADXL335 and LIS344ALH, the LIS331AL uniquely combines ratiometric analog outputs, factory-trimmed calibration, and embedded self-test in a single LGA-16 package-making it optimal for cost-sensitive, analog-focused designs requiring guaranteed out-of-box accuracy and field-verifiable integrity.
Availability
LIS331AL is available at Aetrix Electronics and suitable for mobile terminals, gaming peripherals, appliance control systems, and anti-theft devices requiring stable component supply across industrial and consumer production cycles.
Supply support for LIS331AL 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 analog, MEMS, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The LIS331AL belongs to ST's nano-series MEMS accelerometer product line, engineered for ultra-small form factor and low-power analog motion sensing in space-constrained portable electronics.
FAQ
What is the minimum external capacitor required on each analog output?
A minimum load capacitance of 2.5 nF is required on Voutx, Vouty, and Voutz to ensure stable operation and prevent oscillation. This value sets the lowest practical filter cutoff (~2 kHz) and maintains phase margin with the 32 kΩ output impedance. Lower values risk instability and increased noise susceptibility.
How does the ratiometric output improve system accuracy?
Because both zero-g level and sensitivity scale linearly with VDD, any variation in supply voltage affects the sensor output and the ADC reference proportionally-canceling ratio errors. This eliminates the need for a precision voltage reference and simplifies analog front-end design in battery-powered systems.
Can the LIS331AL be used without calibration after soldering?
Yes. Factory trimming of sensitivity and zero-g offset is stored in non-volatile memory and automatically loaded at power-on. While board-level stress may induce minor offset shift (<5 mV), the device meets full specifications without user calibration under typical mounting conditions.
What happens during self-test activation?
When ST pin is driven high, an electrostatic force displaces the proof mass, generating a predictable +150 mV DC shift on all three outputs (X/Y/Z). This verifies mechanical mobility, charge amplifier functionality, and signal chain integrity-confirming the sensor is operational before deployment.
LIS331AL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-VFLGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Type:
- -
- Axis:
- -
- Acceleration Range:
- ±2g
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- -
- Bandwidth:
- 2kHz
- Output Type:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LGA (3x3)
LIS331AL FAQ
1.How can I place an order for LIS331AL through Aetrix?
Please submit a Request for Quotation (RFQ) for LIS331AL 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 LIS331AL reliable?
The price and inventory of LIS331AL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LIS331AL is usually 5 days.
3.What payment methods are accepted for LIS331AL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LIS331AL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LIS331AL?
LIS331AL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LIS331AL 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 LIS331AL?
For technical support, including LIS331AL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LIS331AL requirements.
6.How does Aetrix verify that LIS331AL is sourced from the original manufacturer or authorized distributors?
All LIS331AL 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 LIS331AL meets industry standards.
7.What is the process for return or replacement of LIS331AL?
All LIS331AL units undergo pre-shipment inspection (PSI). If there is an issue with LIS331AL, 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 LIS331AL part is unused and in its original packaging.
Return procedure for LIS331AL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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