STMicroelectronics LPY430ALTR

Overview

LPY430ALTR from STMicroelectronics is a dual-axis analog MEMS gyroscope measuring angular rate along pitch and yaw axes, with ±300 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 GPS navigation systems.

For engineers reviewing the LPY430ALTR datasheet, LPY430ALTR pinout, LPY430ALTR application, or LPY430ALTR equivalent, key selection factors include its dual-axis analog output architecture, embedded self-test and sleep mode, LGA-28 package compatibility, and temperature-stable sensitivity of 3.33 mV/dps (4× amplified).

Technical Context

The LPY430ALTR integrates a single micromachined driving mass operating via Coriolis principle detection, paired with a dedicated CMOS interface IC that provides trimmed analog voltage outputs. Its signal chain includes embedded low-pass filtering (−3 dB at 140 Hz), optional external high-pass filter reset (HP pin), and PLL-based synchronization between drive and sense circuits.

It supports three power states-normal, sleep (2.1 mA), and power-down (5 µA)-controlled by SLEEP/PD and ST pins. Output options include two independent analog channels per axis: non-amplified (±1200 dps, 0.83 mV/dps) and 4× amplified (±300 dps, 3.33 mV/dps), each with dedicated buffered outputs and internal low-pass filtering.

Key Specifications

Pinout & Package

LGA-28 (4 mm × 5 mm × 1 mm) land grid array package with exposed thermal pad; RoHS-compliant ECOPACK® construction, JEDEC J-STD-020 qualified for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXRS645 and LPY430AHTR, the LPY430ALTR uniquely balances dual-axis analog integration, moderate bandwidth, and factory-trimmed stability in a compact LGA package-making it optimal for cost-sensitive, space-constrained motion UI and navigation systems requiring minimal external components.

Availability

LPY430ALTR is available at Aetrix Electronics and suitable for motion-sensing pointing devices, GPS navigation augmentation, and industrial human-machine interfaces requiring stable component supply across multi-year production cycles.

Supply support for LPY430ALTR 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/mixed-signal products for industrial, automotive, and consumer markets.

The LPY430ALTR belongs to ST's MEMS motion sensor product line, engineered specifically for high-stability, low-power angular rate measurement in space-constrained user-interface and navigation applications.

FAQ

What is the function of the HP pin on the LPY430ALTR?

The HP (High-Pass Filter Reset) pin is an active-high digital input that resets the external high-pass filter capacitor to eliminate DC offset buildup. It must be pulsed high at power-up and after large angular transients to ensure fast settling and accurate zero-rate baseline recovery. Leaving HP unconnected or held low maintains normal operation but may result in slow recovery from saturation.

How do I configure the LPY430ALTR for power-down mode?

To enter power-down mode, drive the SLEEP/PD pin to logic high (Vdd) while holding the ST pin at logic low (GND). In this state, supply current drops to 5 µA and all analog outputs go to high-impedance. The device retains no internal state; full initialization-including PLL lock and output stabilization-is required upon wake-up, typically taking <10 ms.

Can both amplified and non-amplified outputs be used simultaneously on the same axis?

No-using both OUTX and 4xOUTX (or OUTZ and 4xOUTZ) simultaneously is not supported. The internal amplifiers share bias networks and output drivers; concurrent use causes loading conflicts and invalid readings. Choose one output type per axis based on required range and signal chain gain budget, and terminate the unused output with appropriate bias (e.g., Vref for non-amplified, GND for amplified).

What is the role of the FILTVDD and VCONT pins?

FILTVDD and VCONT are PLL filter nodes requiring external RC network connection: FILTVDD connects to a capacitor to ground (typically 10 nF), and VCONT connects to a series R-C (e.g., 2.2 kΩ + 100 nF) to ground. These components set the PLL loop bandwidth and phase margin, directly affecting output stability and noise performance. Incorrect values cause oscillation, increased jitter, or failure to lock-refer to Figure 3 in the datasheet for exact values.