STMicroelectronics LY503ALHTR

Overview

LY503ALHTR from STMicroelectronics is a single-axis MEMS yaw-rate gyroscope delivering analog angular rate output with ±30 °/s full-scale range, 140 Hz bandwidth, and dual-output architecture (amplified 4xOUTZ and non-amplified OUTZ). It operates from 2.7 V to 3.6 V across –40 °C to +85 °C and integrates self-test, power-down, and embedded low-pass filtering for motion sensing in compact portable imaging systems.

For engineers reviewing the LY503ALHTR datasheet, LY503ALHTR pinout, LY503ALHTR application, or LY503ALHTR equivalent, key selection considerations include its LGA-16 package footprint, dual-output voltage scaling (33.3 mV/°/s vs. 8.3 mV/°/s), zero-rate level stability (±0.01 °/s/°C drift), and integrated high-pass filter reset (HP) functionality for overload recovery.

Technical Context

The LY503ALHTR implements a Coriolis-effect-based single-mass micromachined structure driven by a PLL-synchronized oscillator, with demodulation and charge amplification performed on-chip. Its analog signal chain includes two parallel output paths: one buffered non-amplified path (OUTZ) and one 4× gain path (4xOUTZ), each with independent low-pass filtering.

Electrical interface includes digital control pins (ST, PD, HP) operating at CMOS logic levels referenced to Vdd, and analog reference (Vref = 1.23 V) and filter tuning pins (FILTVDD, VCONT) requiring external RC networks. The device supports factory-trimmed sensitivity and zero-rate level with <0.05 %/°C temperature coefficient.

Key Specifications

Pinout & Package

LY503ALHTR is housed in a 5 mm × 5 mm × 1.5 mm plastic land grid array (LGA-16L) package with bottom-side solder pads and no exposed leads. The package supports automated reflow assembly per JEDEC J-STD-020C and features ECOPACK® RoHS/Green compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXRS645 and ENC-03R, LY503ALHTR delivers optimized trade-offs for portable consumer motion sensing: factory-trimmed analog outputs eliminate external gain stages, embedded self-test reduces system-level validation effort, and LGA-16 packaging enables compact PCB layout without through-hole constraints.

Availability

LY503ALHTR is available at Aetrix Electronics and suitable for image stabilization, motion-controlled user interfaces, and GPS-assisted navigation systems requiring stable component supply, consistent factory calibration, and long-term production continuity.

Supply support for LY503ALHTR 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, with manufacturing, R&D, and sales operations across Europe, Asia, and the Americas.

LY503ALHTR belongs to ST's MEMS motion sensor product line, designed specifically for high-accuracy, low-power analog angular rate measurement in consumer imaging and portable electronics.

FAQ

What is the function of the HP pin on LY503ALHTR?

The HP (High Pass Filter Reset) pin is an active-high digital input that resets the external high-pass filter capacitor to restore DC baseline after large angular transients or overload conditions. When asserted, it forces the HP filter to re-center its output, preventing saturation-induced settling delays. It is recommended to assert HP during power-up and after known large rotations.

Can both 4xOUTZ and OUTZ be used simultaneously?

Yes-LY503ALHTR supports concurrent use of 4xOUTZ and OUTZ. The outputs are electrically isolated within the IC and share only the common Vref and ground references. Simultaneous readout enables real-time comparison (e.g., coarse/fine rate estimation) or redundancy, provided PCB layout maintains separation to avoid crosstalk.

How does the self-test (ST) pin verify sensor functionality?

When ST is pulled high, an electrostatic force actuates the micromachined driving mass, simulating a known Coriolis response. This induces a predictable DC-level shift (~±100 mV) in both 4xOUTZ and OUTZ outputs. Measuring this shift against datasheet-specified bounds confirms mechanical integrity and analog signal chain accuracy without external rotation equipment.

What external components are required for basic operation?

Minimum external components include: (1) 100 nF ceramic + 10 µF aluminum decoupling capacitors on Vdd, (2) 1 MΩ resistor and 4.7 µF capacitor on VCONT, (3) 33 kΩ resistor and 2.2 µF capacitor on FILTVDD. These implement the PLL loop filter and stabilize the internal oscillator; omission causes erratic output or failure to start.