STMicroelectronics LPY450AL

Overview

LPY450AL from STMicroelectronics is a dual-axis MEMS gyroscope measuring angular rate along pitch and yaw axes with ±500 dps full-scale range, 140 Hz -3 dB bandwidth, and analog voltage outputs (0.5 mV/dps non-amplified; 2 mV/dps 4× amplified). It operates from 2.7 V to 3.6 V over −40 °C to +85 °C and is used in motion-sensing pointing devices and game controllers requiring stable analog rate feedback.

For engineers reviewing the LPY450AL datasheet, LPY450AL pinout, LPY450AL application, or LPY450AL equivalent, key selection considerations include dual-axis analog output scaling (1×/4×), embedded self-test and sleep/power-down modes, LGA-28 mechanical compatibility, and temperature-stable zero-rate level (±0.08 dps/°C drift) for motion interface calibration.

Technical Context

The LPY450AL integrates a single micromachined oscillating mass operating on the Coriolis principle, with CMOS signal conditioning delivering two independent analog outputs per axis (OUTX/OUTZ and 4xOUTX/4xOUTZ). Its internal PLL synchronizes drive and sense paths, while embedded low-pass filtering supports bandwidth control up to 140 Hz.

It features three configurable power states-normal, sleep (2.1 mA), and power-down (5 µA)-selected via dedicated ST and SLEEP/PD pins. The HP pin enables external high-pass filter reset, and VCONT/FILTVDD pins support PLL loop filter implementation using external RC components.

Key Specifications

Pinout & Package

The LPY450AL is housed in a 4 mm × 5 mm × 1 mm plastic land grid array (LGA-28) package with 28 solder pads on the bottom surface. Pin 1 is marked by a corner cut on the top package surface; no exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LPY450AH and ADXRS645, the LPY450AL uniquely balances dual-axis analog output, wide ±500 dps range, and ultra-low power-down current (5 µA), making it optimal for battery-powered motion UIs needing direct analog interfacing and thermal robustness without digital overhead.

Availability

LPY450AL is available at Aetrix Electronics and suitable for pointing devices, game controllers, motion-controlled UIs, and industrial robotics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LPY450AL 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 specializing in sensors, microcontrollers, and power management ICs, with over 300 million MEMS sensors shipped worldwide.

The LPY450AL belongs to ST's analog-output MEMS gyroscope product line, designed specifically for cost-sensitive, low-power human-interface applications demanding reliable angular rate sensing without digital interface complexity.

FAQ

What is the function of the HP pin on the LPY450AL?

The HP (High-Pass Filter Reset) pin resets an optional external high-pass filter by applying a logic high signal. This action clears DC offset buildup after large angular transients or power-up, restoring accurate baseline tracking within milliseconds. It is recommended to assert HP during initialization and after overload events to maintain measurement fidelity.

How does the self-test feature verify sensor functionality?

When the ST pin is driven high, an electrostatic force actuates the internal proof mass, generating a known Coriolis-equivalent output shift (~250 mV DC change). This validates both mechanical integrity (mass movement) and analog signal chain (amplifier, buffer, output stage) without requiring physical rotation or external test gear.

Can the LPY450AL operate with only one axis enabled?

Yes - the device inherently measures both pitch and yaw simultaneously, but system firmware may process only one axis. No hardware configuration disables an axis; unused outputs (e.g., OUTZ/4xOUTZ) can be left unconnected or terminated to Vref/GND per layout best practices to minimize noise coupling.

What is the role of VCONT and FILTVDD pins?

VCONT and FILTVDD form the PLL loop filter interface: VCONT connects to the PLL charge pump output, and FILTVDD supplies filtered bias to the PLL VCO. External RC components (typically 2.2 kΩ + 10 nF per pin) must be placed close to these pins to stabilize phase lock and suppress jitter in the internal oscillator driving the Coriolis sensing mechanism.