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STMicroelectronics LIS331ALTR
- Part No.:
- LIS331ALTR
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 16-VFLGA
- Datasheet:
-
LIS331ALTR.pdf
- Description:
- ACCELEROMETER 2G ANALOG 16LGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,276
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Product details
Overview
LIS331ALTR from STMicroelectronics is a 3-axis analog-output MEMS accelerometer with ±2g full-scale range, ratiometric output voltage (0.145×VDD V/g), factory-trimmed sensitivity and zero-g offset, and embedded self-test functionality - used in mobile terminals, gaming input devices, and inertial navigation systems.
For engineers reviewing the LIS331ALTR datasheet, LIS331ALTR pinout, LIS331ALTR application, or LIS331ALTR equivalent, this device delivers DC-coupled acceleration sensing with 2.0 kHz bandwidth, 32 kΩ output impedance per channel, and LGA-16 package compatibility for space-constrained consumer electronics designs.
Technical Context
The LIS331ALTR 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 analog outputs (Voutx/Vouty/Voutz) are ratiometric to VDD (3.0–3.6 V), enabling supply-independent measurement accuracy across the -40°C to +85°C operating range.
Each axis employs a dedicated sample-and-hold stage and internal 32 kΩ output resistor, allowing external RC filtering (Cload ≥ 2.5 nF) to set cutoff frequency from 1 Hz to 500 Hz. Self-test activation (ST = VDD) induces +150 mV DC shift per channel, verifying mechanical and electrical integrity without external stimulus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-scale range | ±2.0 g - supports tilt sensing, motion detection, and low-g impact monitoring in handheld devices |
| Sensitivity | 0.145 × VDD V/g (±5%) - ratiometric scaling eliminates supply-induced gain error in ADC chains |
| Zero-g level | VDD/2 ±6% - centered output at rest enables simple DC-coupled signal conditioning |
| Bandwidth | DC to 2.0 kHz - configurable via external Cload (e.g., 100 nF → ~50 Hz anti-aliasing) |
| Output impedance | 32 kΩ per channel - defines RC filter corner with external capacitor; requires high-Z ADC input |
| Self-test output shift | +150 mV per axis - deterministic voltage step confirms sensor actuation and signal path integrity |
| Supply current | 0.65 mA (active), 1 µA (power-down) - enables battery-powered operation with PD pin control |
Pinout & Package
LGA-16 package (3.0 × 3.0 × 1.0 mm), land grid array with exposed pad not connected; RoHS-compliant ECOPACK® construction; pin 1 marked by top-side indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 15 | res (reserved) | Internally connected to VDD; must be externally tied to power supply for proper biasing |
| 3, 7, 8, 10, 12, 14 | NC (not connected) | No internal connection; leave floating or grounded per PCB layout best practices |
| 4 | ST (Self-Test) | Logic high (VDD) activates electrostatic test force; logic low (GND) enables normal operation |
| 5 | PD (Power Down) | Logic high disables analog output stages, reducing current to 1 µA; logic low enables active mode |
| 6 | GND | Analog ground reference for all internal circuitry and output signals |
| 9, 11, 13 | Voutz / Vouty / Voutx | Analog single-ended outputs for Z/Y/X axes; each has 32 kΩ series impedance for RC filtering |
| 16 | VDD | Main supply (3.0–3.6 V); powers sensing element and interface; all analog parameters scale ratiometrically |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed sensitivity & offset | Non-volatile trimming stores calibration coefficients; eliminates need for system-level recalibration |
| Ratiometric analog outputs | Voltage gain and zero-g level track VDD variation, removing supply-dependent errors in downstream ADC conversion |
| Embedded self-test | Deterministic +150 mV DC shift per axis verifies mechanical response and signal chain continuity without external equipment |
| Low-power operation | 0.65 mA active current and 1 µA power-down mode support always-on motion sensing in portable devices |
| High shock survivability | Rated for 10,000 g (0.1 ms) - withstands board assembly, drop testing, and mechanical handling stress |
Applications
| Mobile Handset Tilt Sensing | Gaming Controller Motion Input |
|---|---|
Use Scenario: Detecting portrait/landscape orientation changes in smartphones and tablets for UI auto-rotation. IC Role / Device Role / Timing Role: Analog 3-axis acceleration transducer providing DC-stable output for real-time orientation estimation. Use Value: ±2g range and 0.5% nonlinearity ensure accurate tilt angle calculation up to ±25°; ratiometric outputs maintain accuracy across battery voltage decay. |
Use Scenario: Translating hand gestures and controller movement into game character actions in wireless gamepads. IC Role / Device Role / Timing Role: Low-latency analog motion sensor feeding into microcontroller ADC with configurable bandwidth (up to 2 kHz). Use Value: 2.0 kHz bandwidth captures fast wrist flicks; self-test validates sensor health before gameplay sessions. |
| Appliance Vibration Monitoring | Anti-Theft Tilt Detection |
Use Scenario: Monitoring abnormal vibration signatures in washing machines or HVAC compressors for predictive maintenance. IC Role / Device Role / Timing Role: DC-coupled acceleration monitor capturing low-frequency (<50 Hz) mechanical resonance shifts. Use Value: External RC filtering (e.g., 100 nF → 50 Hz cutoff) rejects motor noise while preserving fault-indicative harmonics. |
Use Scenario: Triggering alarm when unauthorized movement or tilting of secured assets (e.g., ATMs, display kiosks) exceeds threshold. IC Role / Device Role / Timing Role: Always-on tilt detector using power-down mode (1 µA) between periodic wake-ups. Use Value: Factory-trimmed zero-g level ensures consistent trigger point across units; high shock rating prevents false alarms during transport. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis analog-output MEMS accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL335 | Wider supply range (1.8–3.6 V), higher noise density (300 µg/√Hz vs. LIS331ALTR's 300 µg/√Hz), no embedded self-test | Supports lower-voltage battery systems but lacks on-chip diagnostics for field reliability verification | Choose ADXL335 only if 1.8 V operation is required and self-test is implemented externally |
| LIS344ALH | Same LGA-16 footprint, digital I²C/SPI output, higher full-scale (±6g), no ratiometric analog outputs | Requires microcontroller with digital interface; eliminates analog signal chain but adds firmware overhead | Select LIS344ALH when digital integration, higher dynamic range, or multi-device bus sharing is prioritized over analog simplicity |
Compared with ADXL335 and LIS344ALH, the LIS331ALTR uniquely combines ratiometric analog outputs, embedded self-test, and ultra-low power-down current in a compact LGA-16 package - making it optimal for cost-sensitive, battery-operated consumer devices requiring verified analog motion sensing without digital interface complexity.
Availability
LIS331ALTR is available at Aetrix Electronics and suitable for mobile terminals, gaming controllers, appliance vibration monitoring, and anti-theft tilt detection requiring stable component supply and long-term industrial availability.
Supply support for LIS331ALTR 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 electronics.
The LIS331ALTR belongs to ST's nano-series MEMS accelerometer product line, engineered specifically for ultra-compact, low-power consumer electronics where analog output simplicity, factory calibration, and robust mechanical reliability are critical design requirements.
FAQ
What is the minimum external capacitor required for LIS331ALTR output filtering?
The datasheet specifies a minimum load capacitance of 2.5 nF for each output (Voutx/Vouty/Voutz) to ensure stable operation and avoid oscillation. Using less than this value may cause phase margin degradation or unpredictable frequency response due to interaction with the 32 kΩ internal output resistor.
Can LIS331ALTR operate from a 2.8 V supply?
No - the absolute maximum ratings and electrical characteristics specify a valid supply range of 3.0 V to 3.6 V. Operation below 3.0 V is outside specification and may result in undefined output behavior, increased offset drift, or failure to activate self-test functionality reliably.
How does the ratiometric output benefit system-level accuracy?
Because sensitivity (0.145×VDD V/g) and zero-g level (VDD/2) scale linearly with supply voltage, any variation in VDD affects both the sensor output and the reference voltage of a ratiometric ADC equally - canceling first-order supply-induced gain and offset errors without additional calibration.
Is the LIS331ALTR pin-compatible with newer ST accelerometers like LIS3DH?
No - LIS331ALTR uses LGA-16 with 0.875 mm pitch and specific pin assignments (e.g., reserved pins tied to VDD, NC placements), while LIS3DH uses LGA-16 with 0.5 mm pitch and different pinout (e.g., I²C/SPI interfaces, interrupt outputs). Physical and functional incompatibility prevents direct replacement.
LIS331ALTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-VFLGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Analog
- Axis:
- X, Y, Z
- Acceleration Range:
- ±2g
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- 479
- Bandwidth:
- 2kHz
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 3V ~ 3.6V
- Features:
- Adjustable Bandwidth
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LGA (3x3)
LIS331ALTR FAQ
1.How can I place an order for LIS331ALTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LIS331ALTR 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 LIS331ALTR reliable?
The price and inventory of LIS331ALTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LIS331ALTR is usually 5 days.
3.What payment methods are accepted for LIS331ALTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LIS331ALTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LIS331ALTR?
LIS331ALTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LIS331ALTR 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 LIS331ALTR?
For technical support, including LIS331ALTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LIS331ALTR requirements.
6.How does Aetrix verify that LIS331ALTR is sourced from the original manufacturer or authorized distributors?
All LIS331ALTR 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 LIS331ALTR meets industry standards.
7.What is the process for return or replacement of LIS331ALTR?
All LIS331ALTR units undergo pre-shipment inspection (PSI). If there is an issue with LIS331ALTR, 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 LIS331ALTR part is unused and in its original packaging.
Return procedure for LIS331ALTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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