STMicroelectronics LIS331DLF

Overview

LIS331DLF from STMicroelectronics is a MEMS digital-output 3-axis accelerometer with ultra-low-power operation (10 µA in low-power mode), ±2g/±4g/±8g dynamically selectable full-scale range, and dual I²C/SPI serial interface. It delivers 6-bit resolution output at data rates from 0.5 Hz to 400 Hz and supports inertial interrupt generation, 6D orientation detection, and embedded self-test - deployed in motion-activated UIs and impact logging for handheld consumer electronics.

For engineers reviewing the LIS331DLF datasheet, LIS331DLF pinout, LIS331DLF application, or LIS331DLF equivalent, key selection considerations include programmable interrupt thresholds (INT1/INT2), sleep-to-wake latency, high-shock survivability (10,000 g), and dual-interface flexibility for resource-constrained embedded systems.

Technical Context

The LIS331DLF integrates a capacitive MEMS sensing element with a low-noise analog front-end, 6-bit ADC, and configurable digital signal path including high-pass filtering and interrupt logic. Its control registers (CTRL_REG1–CTRL_REG5) enable real-time configuration of output data rate, full-scale range, interrupt triggers, and self-test activation.

It operates across two power modes: normal mode (250 µA, up to 400 Hz ODR) and low-power mode (10 µA, 0.5–10 Hz ODR), with programmable wake-up timing and threshold-based inertial event detection on two independent interrupt pins (INT1, INT2).

Key Specifications

Pinout & Package

Package: LGA-16 (3 mm × 3 mm × 1 mm), surface-mount land grid array with exposed pad for thermal and electrical grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LIS3DH and MMA8452Q, the LIS331DLF offers the lowest active current in its class and unique 6D orientation detection without FIFO overhead - making it ideal for simple, deterministic motion-triggered functions in space- and power-constrained designs.

Availability

LIS331DLF is available at Aetrix Electronics and suitable for display orientation control, gaming motion input, user interface wake-up, and impact recognition requiring stable component supply across consumer electronics production cycles.

Supply support for LIS331DLF 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, microcontrollers, power management, and automotive ICs - headquartered in Geneva, Switzerland, with R&D and manufacturing across Europe and Asia.

The LIS331DLF belongs to ST's "nano" family of ultra-low-power MEMS accelerometers, designed specifically for motion-activated user interfaces and intelligent power saving in battery-operated portable devices.

FAQ

What communication interfaces does the LIS331DLF support?

The LIS331DLF supports both I²C and SPI serial interfaces on shared pins. Interface selection is controlled by the CS pin: high enables I²C mode (SCL/SDA), low enables SPI mode (SPC/SDI/SDO). The SA0 pin sets the LSB of the I²C address, allowing two devices on the same bus. Both protocols support full register read/write access and interrupt status polling.

How does the 6D orientation detection work?

6D orientation detection uses the LIS331DLF's three-axis acceleration vector to identify which of six faces (±X, ±Y, ±Z) is pointing downward. It compares each axis against programmable thresholds in the INT1_CFG and INT2_CFG registers. When a face-down condition is met, the device asserts INT1 or INT2, enabling immediate host MCU response without continuous polling or external computation.

Can the LIS331DLF operate from a single 2.8 V supply?

Yes - the LIS331DLF accepts Vdd from 2.16 V to 3.6 V and Vdd_IO from 1.71 V to Vdd+0.1 V. A single 2.8 V supply can power both Vdd and Vdd_IO, simplifying power design. Alternatively, Vdd_IO may be supplied separately at 1.8 V to interface directly with low-voltage MCUs while Vdd runs at 2.8 V for optimal sensor performance.

What is the purpose of the embedded self-test function?

The embedded self-test applies electrostatic force to the MEMS structure via internal DACs, inducing a known acceleration offset. By comparing output before and after activation (controlled by CTRL_REG4 ST bit), users verify sensor functionality, signal chain integrity, and register accessibility - critical for field-deployed devices where physical access for calibration is impossible.