STMicroelectronics LIS2L02AQ3TR

Overview

LIS2L02AQ3TR from STMicroelectronics is a low-power, 2-axis analog-output MEMS capacitive accelerometer with user-selectable ±2g/±6g full-scale range, 0.3 mg resolution over 100 Hz bandwidth, ratiometric output voltage (Voutx/Vouty), and integrated self-test and power-down functions. It operates from 2.4 V to 5.25 V and is used in mobile terminal motion sensing, free-fall detection for HDD protection, and inertial navigation subsystems.

For engineers reviewing the LIS2L02AQ3TR datasheet, LIS2L02AQ3TR pinout, LIS2L02AQ3TR application, or LIS2L02AQ3TR equivalent, key selection criteria include its QFN-44 package footprint, dual-channel analog voltage outputs, supply-voltage-ratiometric scaling, factory-trimmed zero-g offset and sensitivity, and ±10000g mechanical shock survivability.

Technical Context

The LIS2L02AQ3TR implements a surface-micromachined silicon sensing element with anchored proof mass and capacitive half-bridge transduction, coupled to a fully differential CMOS interface IC featuring correlated double sampling (CDS), charge amplification, and three sample-and-hold stages operating at 66 kHz.

Its analog outputs (Voutx, Vouty) are ratiometric to Vdd, with zero-g level centered at Vdd/2 ±6% and sensitivity of Vdd/5 V/g (±2g) or Vdd/15 V/g (±6g); self-test induces a defined output voltage shift (±100 mV at 3.3 V, ±2g), varying cubically with supply voltage.

Key Specifications

Pinout & Package

Package: QFN-44 (7 mm × 7 mm × 1.8 mm, 0.5 mm pitch), lead-free and RoHS-compliant, with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2-axis analog MEMS accelerometer applications.

Compared with ADXL203ARZ and MMA7260QT, the LIS2L02AQ3TR uniquely combines ±2g/±6g selectability, 0.3 mg resolution, integrated self-test, and 2–5 µA power-down - making it optimal for space-constrained, battery-sensitive inertial applications requiring field-verifiable reliability.

Availability

LIS2L02AQ3TR is available at Aetrix Electronics and suitable for mobile terminal motion sensing, free-fall detection for data protection, and antitheft system tilt monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LIS2L02AQ3TR 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 LIS2L02AQ3TR belongs to ST's legacy MEMS inertial sensor family targeting cost-sensitive, low-power motion detection applications - emphasizing analog simplicity, factory calibration, and robust mechanical performance over digital interfaces or advanced features.

FAQ

What is the function of the FS pin on the LIS2L02AQ3TR?

The FS (Full-Scale) pin selects the measurement range: logic low (connected to GND) configures ±2g full-scale with sensitivity Vdd/5 V/g, while logic high (connected to Vdd) selects ±6g with sensitivity Vdd/15 V/g. This setting also scales the self-test output amplitude by a factor of three, enabling consistent diagnostic coverage across both ranges.

How does the LIS2L02AQ3TR achieve ratiometric output behavior?

All analog parameters - zero-g level (Voff), sensitivity (So), and self-test output shift - scale linearly with Vdd due to internal circuit design. For example, at 3.3 V, Voff = 1.65 V ±6%, and at 5.0 V, Voff ≈ 2.5 V ±6%. This eliminates the need for an external voltage reference when used with ratiometric ADCs, improving system accuracy and reducing component count.

Can the LIS2L02AQ3TR be used with a microcontroller's built-in ADC without external signal conditioning?

Yes, but external RC filtering is mandatory: each output (Voutx/Vouty) has 110 kΩ source impedance and requires ≥320 pF capacitance to form an anti-aliasing low-pass filter. Without this, ADC sampling may capture aliasing artifacts or suffer from settling errors; typical designs use 10–100 nF ceramic capacitors placed directly at the output pins.

What is the purpose of the PD (Power Down) pin, and how quickly does the device wake up?

The PD pin disables internal circuitry to reduce current draw to 2–5 µA. Wake-up time after PD deactivation is determined by external load capacitance: Ton = (550 × Cload) + 0.3 ms, where Cload is in µF. For a typical 10 nF filter capacitor, wake-up takes ~5.3 ms - sufficient for periodic motion sampling in duty-cycled applications like wearable activity monitors.