STMicroelectronics LIS244AL

Overview

LIS244AL 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 integrated self-test functionality. It operates from 2.4V to 3.6V, delivers 32kΩ output impedance per channel, and supports DC–2.0kHz bandwidth for motion sensing in compact portable electronics.

For engineers reviewing the LIS244AL datasheet, LIS244AL pinout, LIS244AL application, or LIS244AL equivalent, this device is selected for low-power, space-constrained inertial sensing where analog interface simplicity, supply-voltage rejection, and mechanical shock survivability (10,000g) are critical design requirements.

Technical Context

The LIS244AL 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 provides single-ended analog voltages (V_OUTX, V_OUTY) ratiometric to V_DD, enabling direct connection to ADCs without external gain/level-shifting.

Self-test activation via the ST pin applies electrostatic force to the proof mass, inducing a calibrated 105mV DC-level shift per axis at V_DD = 3.0V - verifying both mechanical integrity and signal chain functionality. Bandwidth is externally adjustable using load capacitance (C_LOAD ≥ 2.5nF) across the 32kΩ internal output resistor.

Key Specifications

Pinout & Package

LGA-16 package (4.0mm × 4.0mm × 1.5mm), land grid array with exposed pad not connected; RoHS-compliant ECOPACK® lead-free finish; operating temperature range −40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL202E and LIS344ALH, the LIS244AL offers the simplest analog integration path for 2-axis motion sensing, with guaranteed ratiometric behavior and minimal external components - ideal for cost-sensitive, space-constrained designs where analog ADC interfacing is preferred.

Availability

LIS244AL is available at Aetrix Electronics and suitable for mobile terminals, gaming input devices, appliance user interfaces, and anti-theft systems requiring stable component supply and long-term industrial availability.

Supply support for LIS244AL 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The LIS244AL belongs to ST's legacy MEMS analog accelerometer family, engineered specifically for ultra-compact, low-power motion sensing in battery-operated portable electronics where analog interface simplicity and mechanical ruggedness are essential.

FAQ

What is the minimum external load capacitance required on V_OUTX and V_OUTY?

The LIS244AL requires a minimum external load capacitance of 2.5nF on each output to ensure stable operation and defined bandwidth. Using smaller values may cause instability or deviation from the specified 2.0kHz maximum bandwidth. The internal 32kΩ output resistor forms an RC filter with this capacitor, setting the cutoff frequency per Equation 2 in the datasheet.

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

Activating the ST pin applies electrostatic force to the proof mass, generating a known displacement that mimics +1g acceleration. This produces a predictable 105mV DC-level shift in V_OUTX or V_OUTY at V_DD = 3.0V - confirming the sensing element moves correctly and the analog signal chain accurately translates that motion into voltage.

Is the LIS244AL suitable for PCB-level reflow soldering?

Yes - the LGA-16 package is qualified for standard lead-free reflow profiles per JEDEC J-STD-020. Pin 1 indicator is electrically connected to pin 1 but must remain unconnected during soldering. ST specifies peak temperature ≤ 260°C for ≤ 30 seconds, with full compliance to ECOPACK® environmental standards.

Why is the zero-g output specified as V_DD/2 ±15% instead of a fixed voltage?

This specification reflects the ratiometric design: the internal reference and amplifier stages track V_DD proportionally. At 3.0V supply, zero-g output is 1.5V ±225mV; at 2.4V it becomes 1.2V ±180mV. This eliminates supply-induced errors when digitized by a supply-referenced ADC, preserving measurement accuracy across battery discharge.