STMicroelectronics LIS302DLTR

Overview

LIS302DLTR from STMicroelectronics is a 3-axis MEMS digital accelerometer with ±2g/±8g dynamically selectable full-scale range, I²C/SPI interface, and embedded interrupt logic for free-fall and click detection. It operates from 2.16 V to 3.6 V, consumes <1 mW in normal mode, and delivers 100 Hz or 400 Hz output data rates - used in motion-activated user interfaces and portable device orientation sensing.

For engineers reviewing the LIS302DLTR datasheet, LIS302DLTR pinout, LIS302DLTR application, or LIS302DLTR equivalent, key selection considerations include programmable high-pass filtering, self-test capability, inertial wake-up interrupt timing configuration, and LGA-14 (3×5×0.9 mm) package compatibility with space-constrained PCB layouts.

Technical Context

The LIS302DLTR integrates a silicon MEMS sensing element with a CMOS interface IC trimmed for matched performance. Its dual full-scale range (±2g/±8g) is selected via FS bit in CTRL_REG1, enabling trade-offs between resolution (18 mg/digit at ±2g) and dynamic range.

Interrupt generation is handled by two independent configurable blocks: FF_WU_CFG registers define free-fall/wake-up thresholds and duration per axis; CLICK_CFG enables single/double-click recognition using time-windowed acceleration peaks on X/Y/Z axes with dedicated latency and window registers.

Key Specifications

Pinout & Package

Package: LGA-14 (3.0 × 5.0 × 0.9 mm), thin land grid array with bottom-side exposed pad for thermal and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LIS302DLTR, LIS3DSHTR offers greater measurement flexibility at the cost of interface versatility, while MMA8452QT prioritizes energy efficiency over multimode interrupt functionality - making LIS302DLTR optimal for cost-sensitive, dual-protocol designs needing autonomous gesture response.

Availability

LIS302DLTR is available at Aetrix Electronics and suitable for smartphone orientation sensing, gaming peripheral motion input, and industrial vibration monitoring requiring stable component supply across production lifecycles.

Supply support for LIS302DLTR 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 LIS302DLTR belongs to ST's "piccolo" family of ultra-compact accelerometers engineered for space-constrained portable electronics where low power, small footprint, and intelligent interrupt capabilities are essential.

FAQ

What communication protocols does the LIS302DLTR support?

The LIS302DLTR supports both I²C and SPI digital interfaces. Interface mode is selected by the CS pin state: high enables I²C (7-bit address 0x3A/0x3B), low enables SPI (4-wire or 3-wire). Both protocols operate up to 400 kHz (I²C fast-mode) or 10 MHz (SPI), with register-level access to all configuration and data registers.

How is full-scale range selected on the LIS302DLTR?

Full-scale range is selected dynamically via the FS bit (bit 4) in CTRL_REG1 (address 0x20). When FS = 0, the range is ±2 g with 18 mg/digit sensitivity; when FS = 1, it switches to ±8 g with 72 mg/digit sensitivity. No hardware change is needed - only a register write, enabling runtime adaptation to varying motion profiles.

Does the LIS302DLTR include self-test functionality?

Yes, the LIS302DLTR includes an electrostatic self-test feature activated by setting the ST bit (bit 7) in CTRL_REG2 (address 0x21). This applies a known force to the sensing element, producing a measurable output shift (e.g., −3 g on X-axis) that validates sensor integrity and signal path functionality without mechanical stimulation.

What is the purpose of the two interrupt outputs (INT1 and INT2)?

INT1 and INT2 provide independent, programmable interrupt signals for different motion events. INT1 can be configured for free-fall detection while INT2 handles click/double-click recognition - or both can monitor separate axes or thresholds. Each uses dedicated registers (FF_WU_CFG_1/2, CLICK_CFG) for autonomous, low-CPU-overhead event handling.