STMicroelectronics LPY450ALTR

Overview

LPY450ALTR from STMicroelectronics is a dual-axis analog MEMS gyroscope measuring angular rate along pitch and yaw axes, with ±500 dps full-scale range, 140 Hz bandwidth, and analog outputs (amplified and non-amplified) for both axes. 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.

For engineers reviewing the LPY450ALTR datasheet, LPY450ALTR pinout, LPY450ALTR application, or LPY450ALTR equivalent, key selection considerations include its dual-axis analog output architecture, integrated self-test and sleep/power-down modes, temperature-stable sensitivity (2 mV/dps amplified), and LGA-28 package compatibility with high-shock industrial environments.

Technical Context

The LPY450ALTR uses a single micromachined driving mass oscillating continuously and reacting via the Coriolis effect to applied angular rates. Its CMOS interface IC conditions and outputs analog voltage signals-both raw (OUTX/OUTZ) and 4× amplified (4xOUTX/4xOUTZ)-with embedded low-pass filtering and optional external high-pass filter reset via HP pin.

It implements a PLL-based phase-locked loop for internal synchronization of drive and sense paths, requiring external RC components on VCONT and FILTVDD pins. Power management includes three distinct operating modes-normal, sleep (2.1 mA), and power-down (1–5 µA)-configured via dedicated ST and SLEEP/PD pins per Table 6.

Key Specifications

Pinout & Package

The LPY450ALTR is housed in a 4 mm × 5 mm × 1 mm plastic land grid array (LGA-28) package, optimized for surface-mount assembly and thermal/mechanical robustness in motion-sensing modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXRS649 and LPY450AHTR, the LPY450ALTR offers optimal balance of analog simplicity, built-in power management, and precision for consumer-grade motion interfaces-delivering ready-to-use voltage outputs without firmware overhead or external signal conditioning.

Availability

LPY450ALTR is available at Aetrix Electronics and suitable for motion-sensing pointing devices, game controllers, and industrial robotics requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LPY450ALTR 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 analog, MEMS, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The LPY450ALTR belongs to ST's high-reliability MEMS gyroscope product line, engineered specifically for low-power, dual-axis angular rate sensing in space-constrained human-interface applications.

FAQ

What is the function of the HP pin on the LPY450ALTR?

The HP (High-Pass Filter Reset) pin is a logic-controlled input that resets an external high-pass filter connected to the analog outputs. When driven high, it clears DC offset buildup caused by mechanical overload or startup transients, restoring baseline stability within milliseconds. It must be pulsed high briefly after power-up or after large rotational events to maintain accurate zero-rate tracking.

How does the self-test feature verify sensor integrity?

The self-test applies an electrostatic force to the internal seismic mass via the ST pin, emulating a known Coriolis acceleration. This induces a predictable 250 mV DC shift in the output voltage (per Table 3), confirming both mechanical mobility and electrical signal path functionality. No external rotation or motion is required-validation occurs entirely within the IC.

Can the LPY450ALTR operate with only one axis enabled?

Yes-the LPY450ALTR does not require simultaneous use of both axes. Either X or Z output can be used independently; unused analog outputs (e.g., OUTZ or 4xOUTX) may be left unconnected or terminated to Vref/GND per layout best practices. Power consumption remains unchanged since both sensing elements share the same oscillator and bias circuitry.

What external components are mandatory for stable operation?

Mandatory external components include: (1) 100 nF ceramic + 10 µF aluminum decoupling capacitors near Vdd/GND pins; (2) RC network (2.2 kΩ + 10 nF recommended) between VCONT and FILTVDD for PLL loop stability; and (3) optional low-pass filter on amplified outputs if bandwidth beyond 140 Hz is undesirable. No pull-ups or level-shifters are required for control pins.