STMicroelectronics LIS244ALTR

Overview

LIS244ALTR from STMicroelectronics is a 2-axis analog-output MEMS accelerometer with ±2g full-scale range, ratiometric output voltage (0.140×V_DD V/g), factory-trimmed sensitivity and zero-g offset, and embedded self-test functionality. It operates from 2.4V to 3.6V, delivers X/Y channel outputs via high-impedance analog pins (R_OUT = 32 kΩ), and targets motion sensing in space-constrained consumer electronics.

For engineers reviewing the LIS244ALTR datasheet, LIS244ALTR pinout, LIS244ALTR application, or LIS244ALTR equivalent, key selection considerations include its LGA-16 package footprint, 2.0 kHz usable bandwidth (configurable via external C_LOAD), -40°C to +85°C operating range, and ratiometric analog interface requiring high-input-impedance ADC front-ends.

Technical Context

The LIS244ALTR 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 output stage converts differential signals to single-ended ratiometric analog voltages (V_OUTX, V_OUTY) referenced to V_DD/2 at zero-g.

Factory calibration stores trimming values for sensitivity (±10% tolerance) and zero-g level (±15% of V_DD/2) in non-volatile memory, enabling plug-and-play operation without user calibration. Self-test activation (ST pin = V_DD) induces a known electrostatic force, producing 105 mV DC-level shift per axis at V_DD = 3.0 V.

Key Specifications

Pinout & Package

LIS244ALTR uses a 4 mm × 4 mm × 1.5 mm Land Grid Array (LGA-16) package with exposed die pad for thermal and mechanical stability. Pin 1 is marked by an electrical indicator (not connected during soldering). All NC pins must remain unconnected; GND pins (3,5,6,7) require low-inductance grounding.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-axis analog accelerometer applications.

Compared with ADXL202E and MMA7260QT, the LIS244ALTR provides a compact 4×4 mm LGA-16 solution optimized for low-power, two-axis analog motion sensing with factory calibration and self-test-ideal where PCB area, supply voltage headroom (2.4–3.6 V), and plug-and-play analog integration are prioritized.

Availability

LIS244ALTR is available at Aetrix Electronics and suitable for mobile terminals, gaming controllers, appliance interfaces, and robotics platforms requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for LIS244ALTR 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 analog components for industrial, automotive, and consumer markets.

The LIS244ALTR belongs to ST's legacy MEMS analog accelerometer product line, engineered for ultra-compact, low-power motion sensing in cost-sensitive portable electronics where analog interface simplicity and factory calibration reduce system-level design complexity.

FAQ

What is the recommended external capacitor value for anti-aliasing filtering on V_OUTX and V_OUTY?

A minimum 2.5 nF capacitor is required per output to ensure stable operation. For a 100 Hz cutoff, use 50 nF (calculated via f_t = 5 µF / C_LOAD). Ceramic capacitors are preferred for low ESR and stability across temperature. Place capacitors as close as possible to the respective output pins to minimize parasitic inductance.

How does the self-test function verify both mechanical and electrical integrity?

Activating ST = V_DD applies an electrostatic force that displaces the proof mass, generating a repeatable 105 mV DC-level shift at V_OUTX and V_OUTY. This response confirms proper capacitive transduction (mechanical), signal conditioning (electrical), and output driver functionality - all without external test equipment or physical stimulus.

Can LIS244ALTR operate reliably with a 2.5 V supply, and how does this affect sensitivity?

Yes - the device is specified for 2.4–3.6 V operation. At 2.5 V, sensitivity becomes 0.140 × 2.5 V/g = 350 mV/g (±10%), and zero-g output shifts to 1.25 V ±15%. All ratiometric parameters scale linearly, preserving measurement accuracy when paired with a matching reference voltage in the ADC subsystem.

Why are multiple GND pins (3,5,6,7) provided in the LGA-16 package?

The four dedicated GND pins reduce ground impedance and improve noise immunity by distributing return current paths. They must all be connected to a solid, low-inductance ground plane beneath the package. This minimizes voltage drops and coupling between analog and digital sections, critical for maintaining 220 µg/√Hz noise performance and stable zero-g baseline.