STMicroelectronics LIS352AX

Overview

LIS352AX from STMicroelectronics is a 3-axis ±2 g analog-output MEMS accelerometer in LGA-14 package, delivering absolute DC-coupled voltage outputs per axis (Voutx/Vouty/Voutz), with factory-trimmed sensitivity (0.363 V/g) and zero-g level (1.25 V), embedded self-test, power-down mode, and 2 kHz sensing bandwidth-used in mobile terminal tilt detection and free-fall data protection.

For engineers reviewing the LIS352AX datasheet, LIS352AX pinout, LIS352AX application, or LIS352AX equivalent, key selection criteria include its absolute analog output architecture, multiplexed single-pin output capability (via S0/S1 control), 32 kΩ output impedance for external RC filtering, and 10000 g shock survivability in compact LGA-14 (3×5×0.9 mm) packaging.

Technical Context

The LIS352AX integrates a surface-micromachined capacitive sensing element with a CMOS interface IC featuring correlated double sampling (CDS) to suppress offset and 1/f noise, followed by three independent sample-and-hold (S&H) circuits-one per axis-and a 4-channel analog multiplexer (Voutx/Vouty/Voutz/Aux_in) routed to a shared Vout pin.

Its analog outputs are absolute to supply voltage (Vdd), meaning sensitivity (0.363 V/g) and zero-g level (1.25 V) remain stable across Vdd = 2.16–3.6 V; output impedance is fixed at 32 kΩ, enabling low-pass filtering via external capacitors ≥2.5 nF to set corner frequencies from 1 Hz to 500 Hz per channel.

Key Specifications

Pinout & Package

LGA-14 (3 mm × 5 mm × 0.9 mm) land grid array package with 0.8 mm pitch; exposed pad not electrically connected; RoHS-compliant ECOPACK® construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL335 and LIS344ALH, the LIS352AX uniquely combines factory-trimmed absolute analog outputs, integrated 4:1 analog multiplexer, and self-test in a single LGA-14 package-reducing BOM count and firmware overhead for cost-sensitive battery-powered tilt and fall-detection systems.

Availability

LIS352AX is available at Aetrix Electronics and suitable for mobile terminal tilt sensing, free-fall data protection, gaming input devices, and anti-theft motion triggers requiring stable component supply and long-term industrial availability.

Supply support for LIS352AX 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 automotive electronics with emphasis on reliability and industrial-grade performance.

The LIS352AX belongs to ST's "piccolo" family of ultra-compact analog accelerometers-engineered specifically for space-constrained, battery-operated consumer and industrial devices needing DC-stable motion sensing without digital interface complexity.

FAQ

What is the purpose of the Aux_in pin on the LIS352AX?

The Aux_in pin serves as a fourth input path for the internal analog multiplexer. When S1 and S0 are both high (11), the Vout pin outputs the voltage applied to Aux_in instead of Voutx/Vouty/Voutz. This allows designers to monitor an external analog signal-such as battery voltage or temperature sensor output-using the same ADC channel as the accelerometer axes, reducing system component count.

How does the LIS352AX achieve stable sensitivity across supply voltage variations?

The LIS352AX uses an absolute output architecture where sensitivity (0.363 V/g) and zero-g level (1.25 V) are referenced directly to Vdd. Its internal circuitry maintains constant gain and offset ratios relative to supply voltage, so changes in Vdd from 2.16 V to 3.6 V do not alter the transfer function-enabling reliable operation with unregulated or varying power sources without recalibration.

Can the LIS352AX be used without external filtering capacitors?

No-external capacitors ≥2.5 nF are required on Voutx/Vouty/Voutz pins to form low-pass filters with the internal 32 kΩ output impedance. Without them, the output exhibits excessive noise and aliasing above the intended bandwidth. Even when using only the multiplexed Vout pin, a capacitor ≥10 pF must be placed there to ensure stable operation and prevent oscillation due to capacitive loading effects.

What mechanical mounting considerations apply to the LIS352AX LGA-14 package?

The LIS352AX uses a 14-terminal LGA package with 0.8 mm pitch and 3×5 mm footprint. ST recommends following JEDEC J-STD-020C reflow profiles, avoiding mechanical stress on the package during PCB flexure, and using symmetric land patterns with thermal relief for the central exposed pad (non-connected). Pin 1 indicator must remain unconnected during soldering to prevent damage to the MEMS structure.