STMicroelectronics LIS331DL

Overview

LIS331DL from STMicroelectronics is a 3-axis MEMS digital accelerometer with ±2g/±8g dynamically selectable full-scale range, I²C/SPI interface, and embedded motion detection logic. It delivers 100 Hz or 400 Hz output data rates, operates from 2.16 V to 3.6 V, consumes <1 mW, and features programmable free-fall, click/double-click, and high-pass filtering - used in portable device orientation sensing and inertial wake-up systems.

For engineers reviewing the LIS331DL datasheet, LIS331DL pinout, LIS331DL application, or LIS331DL equivalent, key selection considerations include its dual-range acceleration sensitivity (18 mg/digit @ ±2g / 72 mg/digit @ ±8g), interrupt-driven event detection (INT1/INT2), LGA-16 3×3×1 mm package, and -40 °C to +85 °C industrial temperature operation.

Technical Context

The LIS331DL integrates a silicon MEMS sensing element with a CMOS interface IC trimmed for optimal matching. Its signal chain includes charge amplifiers, analog-to-digital conversion, and configurable digital filters including a user-programmable high-pass filter for motion artifact rejection.

Interrupt generation is fully programmable per axis: free-fall/wake-up thresholds (FF_WU_THS_1/2), duration windows (FF_WU_DURATION_1/2), and click timing parameters (CLICK_TimeLimit, CLICK_Window) are stored in dedicated registers and updated on-the-fly via I²C or SPI.

Key Specifications

Pinout & Package

The LIS331DL is housed in a 3 mm × 3 mm × 1 mm plastic Land Grid Array (LGA-16) package with bottom-side solder pads. The package supports automated reflow assembly and provides robust mechanical stability for handheld devices.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-axis digital accelerometer applications.

Compared with LIS331DL, LIS3DH offers higher performance for demanding motion analytics while maintaining pin/register compatibility, whereas ADXL345 provides simpler configuration and broader third-party driver support at the expense of embedded intelligence and temperature stability.

Availability

LIS331DL is available at Aetrix Electronics and suitable for smartphone screen rotation, wearable fall detection, gaming controller motion input, and industrial vibration monitoring requiring stable component supply across long production lifecycles.

Supply support for LIS331DL 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 LIS331DL belongs to ST's "nano" family of ultra-compact motion sensors, engineered specifically for space-constrained portable electronics requiring low-power, intelligent inertial sensing with minimal host processing overhead.

FAQ

What communication interfaces does the LIS331DL support?

The LIS331DL supports both I²C and SPI digital interfaces. Interface selection is controlled by the CS pin: high for I²C (address 0x30 or 0x32 via SA0), low for SPI (4-wire or 3-wire mode). I²C operates up to 400 kHz; SPI supports clock frequencies up to 10 MHz, enabling fast register access and high-throughput data streaming.

How is free-fall detection configured on the LIS331DL?

Free-fall detection is configured using three registers: FF_WU_CFG_1 sets axis enable and event type; FF_WU_THS_1 defines the acceleration threshold (in LSB units); FF_WU_DURATION_1 specifies the minimum number of consecutive samples below threshold. These registers are written via I²C/SPI and take effect immediately, allowing runtime adaptation to different mounting orientations or environmental conditions.

Does the LIS331DL require external components for basic operation?

Yes - a 100 nF ceramic decoupling capacitor is required between Vdd and GND, and a second 100 nF capacitor between Vdd_IO and GND. Pull-up resistors (typically 4.7 kΩ) are needed on SDA/SCL for I²C operation. No external passive components are required for SPI mode or for embedded functions like click detection or self-test.

What is the purpose of the SA0 pin on the LIS331DL?

The SA0 pin sets the least-significant bit of the I²C slave address: tied to GND for 0x30, tied to Vdd_IO for 0x32. This allows two LIS331DL devices to share the same I²C bus without address conflict, supporting dual-sensor configurations such as differential tilt sensing or redundant motion monitoring in safety-critical applications.