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STMicroelectronics LIS331DLFTR
- Part No.:
- LIS331DLFTR
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 16-VFLGA
- Datasheet:
-
LIS331DLFTR.pdf
- Description:
- ACCELEROMETER 2-8G I2C/SPI 16LGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,287
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Product details
Overview
LIS331DLFTR from STMicroelectronics is a MEMS digital-output 3-axis ultra-low-power accelerometer with ±2g/±4g/±8g dynamically selectable full-scale range, 6-bit resolution, I²C/SPI interface, and dual programmable interrupt outputs for motion detection and free-fall. It operates from 2.16 V to 3.6 V, consumes as low as 10 µA in low-power mode, and is used in display orientation, gaming, and impact logging in handheld devices.
For engineers reviewing the LIS331DLFTR datasheet, LIS331DLFTR pinout, LIS331DLFTR application, or LIS331DLFTR equivalent, key selection criteria include its 10 µA low-power mode current, 6D orientation detection capability, 10000 g shock survivability, and configurable interrupt thresholds for inertial wake-up events.
Technical Context
The LIS331DLFTR integrates a capacitive MEMS sensing element with signal conditioning, a 6-bit A/D converter, and programmable control logic for interrupt generation and self-test. Its dual interrupt generators (INT1, INT2) support independent configuration for free-fall, motion detection, and 6D position recognition via threshold and duration registers.
It supports two operational modes: normal mode (ODR up to 400 Hz) and low-power mode (ODR down to 0.5 Hz), with dynamic full-scale selection and high-pass filtering for zero-g offset compensation. The device uses factory-calibrated sensitivity and includes embedded self-test functionality verified by output LSB shift under controlled excitation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.16 V to 3.6 V - Enables direct integration with 2.5 V/3.3 V system rails without level-shifting. |
| Low-Power Mode Current | 10 µA - Allows battery-powered operation for months in always-on motion-detection applications. |
| Full-Scale Range | ±2g / ±4g / ±8g - Dynamically selectable via register to optimize resolution vs. range for specific use cases. |
| Output Data Rate | 0.5 Hz to 400 Hz - Configurable ODR supports both ultra-low-power logging and responsive UI feedback. |
| Interface | I²C and SPI - Dual serial protocols simplify host MCU compatibility across embedded platforms. |
| Interrupt Outputs | 2 independent pins (INT1, INT2) - Enable hardware-triggered wake-up without CPU polling, reducing system power. |
| Shock Survivability | 10000 g - Ensures robustness in drop-prone consumer electronics like smartphones and wearables. |
| Operating Temperature | −40 °C to +85 °C - Qualified for industrial and extended-environment portable device deployment. |
Pinout & Package
Package: LGA-16 (3 mm × 3 mm × 1 mm), land grid array with exposed pad for thermal and mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vdd_IO | I/O supply rail - Decoupled separately from core Vdd to support 1.8 V logic compatibility. |
| 4 | SCL/SPC | Shared clock input - Functions as I²C SCL or SPI SPC depending on CS state. |
| 6 | SDA/SDI/SDO | Multi-function bidirectional data - Supports I²C SDA, SPI SDI (input), and 3-wire SDO (output). |
| 7 | SDO/SA0 | Output/data address bit - SPI SDO output or I²C SA0 address bit for device addressing. |
| 8 | CS | Mode select and chip enable - High = I²C mode; Low = SPI mode with active-low chip select. |
| 9 & 11 | INT2 & INT1 | Dedicated inertial interrupt outputs - Open-drain, independently configurable for motion, free-fall, or 6D events. |
| 5, 12, 13, 16 | GND | Four ground terminals - Reduce impedance and improve noise immunity in compact layouts. |
| 14 | Vdd | Analog/digital core supply - Powers internal MEMS, ADC, and logic; separate from Vdd_IO. |
Key Features
| Feature | Design Value |
|---|---|
| Sleep-to-wake-up function | Hardware-accelerated transition from 1 µA power-down to active sensing in <11 ms at 100 Hz ODR. |
| 6D orientation detection | Identifies device position (up/down/left/right/front/back) using sign-based axis comparison without host computation. |
| Embedded self-test | Verifies sensor integrity in-system via controlled electrostatic actuation and measurable LSB shift per axis. |
| Programmable interrupt generators | Two fully independent engines with user-defined thresholds, duration windows, and event logic (OR/AND). |
| High shock survivability | 10000 g rating ensures functional reliability after mechanical stress common in portable electronics handling. |
Applications
| Display Orientation | Gaming Motion Control |
|---|---|
Use Scenario: Automatic screen rotation in smartphones and tablets based on gravitational vector. IC Role / Device Role / Timing Role: Primary 3-axis orientation sensor providing real-time acceleration data for tilt calculation. Use Value: Enables seamless portrait/landscape switching with <100 ms latency and minimal CPU overhead via interrupt-driven updates. |
Use Scenario: Gesture-based controls in handheld gaming consoles and VR accessories. IC Role / Device Role / Timing Role: Motion trigger for action commands (e.g., shake-to-reload, tilt-steering). Use Value: Delivers sub-50 ms response time at 400 Hz ODR while maintaining 10 µA background monitoring current. |
| User Interface Navigation | Impact Recognition & Logging |
Use Scenario: Scroll acceleration and flick gestures in touchless interfaces (e.g., smart remotes, kiosks). IC Role / Device Role / Timing Role: Low-latency motion detector feeding gesture engine with filtered acceleration deltas. Use Value: Reduces false triggers via built-in high-pass filter and programmable interrupt duration window. |
Use Scenario: Drop detection and impact severity logging in logistics trackers and ruggedized tablets. IC Role / Device Role / Timing Role: Shock event recorder capturing peak g-force and timestamp via INT1/INT2 latching. Use Value: Survives 10000 g shocks and provides reliable post-event data retrieval without sensor damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis MEMS accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LIS3DHTR | Higher resolution (12-bit), wider ODR range (up to 1 kHz), lower noise floor (200 µg/√Hz), but higher typical current (7 µA LP mode vs. 10 µA for LIS331DLFTR). | Better suited for precision motion tracking (e.g., pedometers, activity monitors); less optimized for ultra-low-power always-on wake-up. | Select when resolution and bandwidth outweigh minimum quiescent current requirements. |
| MMA8452Q | Integrated FIFO (32 samples), auto-wake-from-sleep, and configurable high-pass filter, but no 6D detection and higher min. supply (1.95 V). | Preferred for buffered burst-read scenarios (e.g., firmware-over-the-air motion analysis); lacks native 6D orientation logic. | Choose when host MCU needs pre-processed data bursts rather than real-time interrupt-driven events. |
Compared with LIS331DLFTR, LIS3DHTR offers superior resolution and bandwidth at slightly lower LP-mode current, while MMA8452Q adds FIFO buffering and auto-wake but omits 6D detection-making LIS331DLFTR uniquely balanced for low-power, interrupt-centric orientation and impact applications.
Availability
LIS331DLFTR is available at Aetrix Electronics and suitable for display orientation, gaming motion control, and impact logging requiring stable component supply across consumer electronics, industrial handhelds, and IoT edge devices.
Supply support for LIS331DLFTR 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 specializing in MEMS sensors, microcontrollers, and power management ICs, with manufacturing and R&D centers across Europe, Asia, and the Americas.
The LIS331DLFTR belongs to ST's "nano" family of ultra-low-power accelerometers, designed specifically for battery-constrained portable devices needing intelligent motion awareness with minimal energy budget.
FAQ
What communication protocols does the LIS331DLFTR support?
The LIS331DLFTR supports both I²C and SPI serial interfaces. I²C uses SCL/SDA pins with SA0 for address selection; SPI uses SPC/SDI/SDO with CS for mode selection. Both operate at standard speeds (I²C up to 400 kHz, SPI up to 10 MHz), and the interface is selected by the logic level on the CS pin.
How does the 6D orientation detection work without external processing?
The LIS331DLFTR implements dedicated hardware logic that compares signed acceleration values across X/Y/Z axes to determine one of six primary orientations (up/down/left/right/front/back). This is configured via CTRL_REG4 and reported through STATUS_REG bits, eliminating need for host-side vector math.
Can the LIS331DLFTR generate interrupts for both motion and free-fall simultaneously?
Yes - it features two independent interrupt generators (INT1 and INT2), each configurable for motion detection, free-fall, or 6D position change. Thresholds, duration windows, and event logic (AND/OR) are set separately in INT1_CFG/INT2_CFG registers, enabling concurrent hardware-triggered responses.
What is the significance of the 10000 g shock survivability rating?
This rating means the LIS331DLFTR remains functional after exposure to transient mechanical shocks up to 10000 g (≈98,000 m/s²), validated per MIL-STD-883H Test Method 2002. It ensures reliability in drop-prone applications like smartphones, tablets, and wearable trackers during real-world handling.
LIS331DLFTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-VFLGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- X, Y, Z
- Acceleration Range:
- ±2g, 4g, 8g
- Sensitivity (LSB/g):
- 16 (±2g) ~ 4 (±8g)
- Sensitivity (mV/g):
- -
- Bandwidth:
- 25Hz ~ 200Hz
- Output Type:
- I2C, SPI
- Voltage - Supply:
- 2.16V ~ 3.6V
- Features:
- Adjustable Bandwidth, Selectable Scale, Sleep Mode
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LGA (3x3)
LIS331DLFTR FAQ
1.How can I place an order for LIS331DLFTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LIS331DLFTR 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 LIS331DLFTR reliable?
The price and inventory of LIS331DLFTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LIS331DLFTR is usually 5 days.
3.What payment methods are accepted for LIS331DLFTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LIS331DLFTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LIS331DLFTR?
LIS331DLFTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LIS331DLFTR 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 LIS331DLFTR?
For technical support, including LIS331DLFTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LIS331DLFTR requirements.
6.How does Aetrix verify that LIS331DLFTR is sourced from the original manufacturer or authorized distributors?
All LIS331DLFTR 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 LIS331DLFTR meets industry standards.
7.What is the process for return or replacement of LIS331DLFTR?
All LIS331DLFTR units undergo pre-shipment inspection (PSI). If there is an issue with LIS331DLFTR, 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 LIS331DLFTR part is unused and in its original packaging.
Return procedure for LIS331DLFTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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