STMicroelectronics LIS332AR

Overview

LIS332AR from STMicroelectronics is a 3-axis analog-output MEMS accelerometer with ±2 g full-scale range, ratiometric voltage output, and integrated self-test and power-down modes. It delivers high stability over temperature (±0.01 %/°C sensitivity drift), 10000 g shock survivability, and operates from 2.16–3.6 V supply. Used in tilt sensing, free-fall detection, and motion tracking within compact portable electronics.

For engineers reviewing the LIS332AR datasheet, LIS332AR pinout, LIS332AR application, or LIS332AR equivalent, key selection criteria include its analog ratiometric output architecture, LGA-16 package footprint, ±2 g range with 0.2·V_DD V/g sensitivity, self-test functionality, and bandwidth programmability via external capacitive load.

Technical Context

The LIS332AR integrates a surface-micromachined silicon sensing element with a fully differential CMOS interface featuring correlated double sampling (CDS) to suppress offset and 1/f noise. Its analog outputs (V_OUTX, V_OUTY, V_OUTZ) are ratiometric to V_DD, ensuring consistent scaling across supply variations.

Factory-trimmed non-volatile parameters calibrate zero-g level (V_OFF = V_DD/2 ±6%) and sensitivity (S_O = 0.2·V_DD ±5% V/g). Bandwidth is set externally via C_LOAD ≥2.5 nF across each output, with f_CUT-OFF = 1/(2π·32 kΩ·C_LOAD), enabling configurable filtering from DC to 2.0 kHz.

Key Specifications

Pinout & Package

The LIS332AR is housed in a 3 mm × 3 mm × 1.0 mm plastic land grid array (LGA-16) package with exposed die pad for thermal and mechanical stability. Pin 1 indicator is located at top-left corner in top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL335 and MMA7361L, the LIS332AR provides superior temperature stability, built-in self-test, and lower noise-making it optimal for battery-powered motion-triggered systems requiring long-term reliability without recalibration.

Availability

LIS332AR is available at Aetrix Electronics and suitable for tilt sensing, free-fall detection, and inertial motion tracking requiring stable component supply, ECOPACK® compliance, and LGA-16 footprint compatibility.

Supply support for LIS332AR 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, delivering innovative solutions across automotive, industrial, and consumer markets since 1987.

The LIS332AR belongs to ST's "nano" family of MEMS motion sensors-designed specifically for ultra-compact, low-power analog acceleration sensing in space-constrained portable electronics.

FAQ

What is the minimum external capacitor required for stable LIS332AR output filtering?

A minimum load capacitance of 2.5 nF is required on each analog output (V_OUTX, V_OUTY, V_OUTZ) to ensure proper low-pass filtering and avoid instability. This value establishes the lowest usable cutoff frequency (~2.0 kHz) and prevents resonance with the 32 kΩ internal output impedance. Smaller values risk aliasing and increased noise susceptibility.

How does the ratiometric output benefit system-level accuracy?

The LIS332AR's ratiometric design ties sensitivity and zero-g level directly to V_DD, so any variation in supply voltage proportionally affects both the sensor output and the ADC reference voltage. This cancels first-order supply-induced gain and offset errors in the signal chain, improving end-to-end accuracy without requiring separate voltage regulation or post-processing compensation.

Can the LIS332AR be used without external calibration?

Yes-the device undergoes factory calibration for zero-g level and sensitivity, with trimming values stored in non-volatile memory. Upon power-up, these parameters are automatically loaded, enabling immediate use with typical initial offset ≤±6% of V_DD/2 and sensitivity tolerance ≤±5%. No user calibration is needed for most tilt or motion-detection applications.

What is the functional impact of connecting the RES pins to V_DD?

Pins 2 and 15 labeled RES must be externally connected to V_DD to bias internal reference circuitry. Leaving them unconnected disables proper operation of the analog front-end, resulting in invalid or missing outputs. This connection is mandatory per ST's layout guidelines and is not optional-even if unused in simplified schematics.