STMicroelectronics LPR430ALTR

Overview

LPR430ALTR from STMicroelectronics is a dual-axis MEMS gyroscope measuring angular rate along pitch and roll axes with ±300 dps full-scale range, 140 Hz -3 dB bandwidth, and analog absolute-rate outputs (both 1× and 4× amplified). It operates from 2.7 V to 3.6 V across –40 °C to +85 °C and is used in motion-sensitive pointing devices and GPS navigation systems.

For engineers reviewing the LPR430ALTR datasheet, LPR430ALTR pinout, LPR430ALTR application, or LPR430ALTR equivalent, key selection considerations include its dual-axis analog output architecture, embedded self-test and sleep mode, temperature-stable sensitivity (±0.07 %/°C), and LGA-28 package compatibility with industrial motion tracking and embedded UI designs.

Technical Context

The LPR430ALTR integrates a single micromachined driving mass oscillating continuously and reacting via Coriolis effect to applied angular rates. Its CMOS interface IC provides factory-trimmed analog voltage outputs referenced to 1.5 V Vref, with non-ratiometric sensitivity (3.33 mV/dps for 4×OUT).

It features two independent signal chains per axis - one unamplified (OUTX/OUTY, 0.83 mV/dps) and one 4× amplified (4xOUTX/4xOUTY) - each with integrated low-pass filtering. Power management includes three modes (normal, sleep, power-down) controlled by dedicated ST and SLEEP/PD pins, with supply current ranging from 5 µA (power-down) to 6.8 mA (active).

Key Specifications

Pinout & Package

LPR430ALTR is housed in a 4 mm × 5 mm × 1 mm plastic land grid array (LGA-28) package, optimized for surface-mount assembly and mechanical shock survivability (up to 3000 g). The LGA footprint supports high-density PCB layouts while maintaining robust solder joint integrity under vibration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXRS645 and LPY410AL, the LPR430ALTR uniquely delivers true dual-axis analog output in one LGA-28 package with embedded sleep mode and factory-trimmed temperature stability-reducing system-level complexity for motion UI and GPS-augmentation use cases.

Availability

LPR430ALTR is available at Aetrix Electronics and suitable for motion tracking interfaces, GPS dead-reckoning modules, and industrial robotics platforms requiring stable component supply and long-term lifecycle support.

Supply support for LPR430ALTR 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 LPR430ALTR belongs to ST's MEMS motion sensor product line, engineered specifically for low-power, high-stability angular rate measurement in space-constrained human-interface and navigation applications.

FAQ

What is the function of the HP pin on the LPR430ALTR?

The HP (High-Pass Filter Reset) pin is a logic-controlled input that resets an optional external high-pass filter connected to the analog outputs. When driven high, it clears accumulated DC offset in the external filter, preventing saturation during startup or sudden large-angle rotations. It must be held low during normal operation to maintain continuous angular rate tracking.

How does the self-test feature verify sensor integrity?

The self-test applies an electrostatic force to the internal MEMS 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 of the sensing element and correct gain/offset behavior of the analog signal chain-no external motion or test equipment required.

Can the LPR430ALTR operate without external low-pass filtering?

Yes-the device includes an embedded 140 Hz low-pass filter. However, external RC filtering is recommended to suppress higher-frequency noise and aliasing. If external filtering is omitted and 4× amplified outputs are used, pins 1–5 (X) and 16–20 (Y) must be shorted respectively; otherwise, unamplified outputs require pins 5 and 16 tied to Vref (1.5 V) for proper biasing.

What is the role of the VCONT and FILTVDD pins?

VCONT and FILTVDD are dedicated connections for the internal PLL's loop filter. External resistors and capacitors placed between these pins configure the PLL's damping and lock time. Correct implementation ensures stable oscillation of the MEMS driving mass and accurate synchronization between drive and sense phases-critical for minimizing quadrature error and bias drift.