STMicroelectronics LPY550AL

Overview

LPY550AL from STMicroelectronics is a dual-axis MEMS gyroscope measuring angular rate along pitch and yaw axes with ±500°/s full-scale range, 140 Hz bandwidth, and absolute analog output (2 mV/°/s for 4× amplified outputs). It operates from 2.7–3.6 V, supports self-test and power-down modes, and targets motion-sensing interfaces in consumer controllers and robotics.

For engineers reviewing the LPY550AL datasheet, LPY550AL pinout, LPY550AL application, or LPY550AL equivalent, key selection criteria include its dual-axis analog output architecture, temperature-stable zero-rate level (1.23 V), integrated low-pass filtering, and LGA-16 package compatibility with high-shock environments.

Technical Context

The LPY550AL integrates a single micromachined driving mass operating via Coriolis principle detection, paired with a dedicated CMOS interface IC that provides two independent analog output channels per axis - one unamplified (0.5 mV/°/s) and one 4× amplified (2 mV/°/s). Its embedded PLL synchronizes drive and sense circuits for stable oscillation.

It features factory-trimmed reference voltage (Vref = 1.23 V), programmable self-test (ST pin), power-down control (PD pin), and high-pass filter reset (HP pin). Electrical operation is specified across –40°C to +85°C with <0.037 %/°C sensitivity drift and <0.08 °/s/°C zero-rate offset drift.

Key Specifications

Pinout & Package

LPY550AL is housed in a 5 mm × 5 mm × 1.5 mm plastic land grid array (LGA-16) package with exposed pad for thermal and mechanical stability. The bottom-side layout includes 16 solder lands arranged in a 4×4 grid, with pin 1 located at top-left corner (marked by chamfer).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXRS649 and MPU-6050, LPY550AL uniquely delivers dual-axis analog outputs with factory-trimmed Vref and embedded self-test in an LGA package-making it optimal for cost-sensitive, low-power motion controllers requiring immediate analog interfacing without host processing overhead.

Availability

LPY550AL is available at Aetrix Electronics and suitable for gaming peripherals, industrial robotic feedback systems, gesture-controlled pointing devices, and autonomous mobile robot orientation tracking requiring stable component supply and long-term manufacturability.

Supply support for LPY550AL 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 devices for industrial, automotive, and consumer markets.

LPY550AL belongs to ST's MEMS motion sensor product line, engineered specifically for high-reliability, low-power dual-axis angular rate measurement in space-constrained human-interface applications.

FAQ

What is the function of the HP pin on LPY550AL?

The HP (High Pass Filter Reset) pin is a logic-controlled input that, when driven high, discharges the external high-pass filter capacitor. This prevents output saturation during large transient rotations and is recommended at power-up to ensure stable DC baseline recovery. It does not affect internal low-pass filtering or sensor operation.

Can LPY550AL operate without external filtering components?

Yes - the LPY550AL includes an embedded 140 Hz low-pass filter. If external high-pass or low-pass filtering is omitted, pins 4–5 (OUTX–4xINX) and 9–10 (4xINZ–OUTZ) must be shorted when using amplified outputs. For unamplified outputs, pins 5 and 9 should be tied to Vref (1.23 V) per datasheet guidance.

How does the self-test function verify sensor integrity?

The self-test applies an electrostatic force to the micromachined driving mass, inducing a known Coriolis-like response. When ST pin is high, the output shifts predictably (e.g., ~1 V change on 4xOUTX at Vdd = 3 V). A measurable, repeatable DC shift confirms both mechanical resonance and analog signal chain functionality without external rotation.

Is LPY550AL pin-compatible with other ST gyros like LY550AL?

No - LPY550AL uses a 16-pin LGA package with unique pin assignments including dual 4× outputs (pins 6 and 8), HP (pin 13), and reserved pins (14–15). LY550AL is obsolete and used different packaging and pinout; no mechanical or electrical pin compatibility exists between them.