STMicroelectronics LY3100ALH

Overview

LY3100ALH from STMicroelectronics is a single-axis MEMS yaw-rate gyroscope delivering analog angular-rate output with ±1000 dps full-scale range, 1.1 mV/dps sensitivity, and 140 Hz −3 dB bandwidth. It operates from 2.7 V to 3.6 V over −40°C to +85°C and integrates self-test, sleep mode, and power-down functionality. Used in motion-sensing game controllers for precise rotational input detection.

For engineers reviewing the LY3100ALH datasheet, LY3100ALH pinout, LY3100ALH application, or LY3100ALH equivalent, key selection considerations include analog output linearity (±1% FS), zero-rate drift (0.02 dps/°C), low-power sleep mode (2.2 mA), and LGA-10 mechanical compatibility for compact handheld designs.

Technical Context

The LY3100ALH implements a Coriolis-effect-based sensing element with continuous oscillation of a single driving mass, coupled to a CMOS interface IC that conditions and outputs angular rate as an absolute analog voltage referenced to Vref. Its internal PLL synchronizes drive and sense paths to maintain phase coherence across temperature.

It features embedded signal conditioning including integrated low-pass filtering via external R/C on VCONT, factory-trimmed sensitivity and zero-rate level, and digital-configurable operating modes (normal/sleep/self-test/power-down) controlled by ST and SLEEP/PD pins with defined logic thresholds.

Key Specifications

Pinout & Package

LY3100ALH uses a 3 mm × 5 mm × 1 mm plastic land grid array (LGA-10) package with bottom-side solder pads and no leads. The package supports automated reflow assembly per JEDEC J-STD-020 and includes ECOPACK® RoHS/Green compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXRS649 and LPY510AL, LY3100ALH uniquely balances analog simplicity, integrated diagnostics (self-test), and optimized power/performance for battery-operated human-interface devices requiring ±1000 dps fidelity without digital overhead.

Availability

LY3100ALH is available at Aetrix Electronics and suitable for gaming peripherals, industrial robotics, pointing devices, and remote control gesture interfaces requiring stable component supply and long-term manufacturability.

Supply support for LY3100ALH 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 and R&D facilities across Europe, Asia, and the Americas.

The LY3100ALH belongs to ST's iNEMO™ family of inertial sensors, designed specifically for motion-sensing user interfaces in consumer and industrial equipment where analog output, low power, and robust MEMS reliability are essential.

FAQ

What is the recommended external circuit for the VCONT pin?

The VCONT pin (Pin 3) requires an external RC low-pass filter to stabilize the internal PLL. ST specifies a 10 kΩ resistor in series with a 100 nF capacitor to ground, plus a 470 nF capacitor between VCONT and GND. This configuration sets the PLL loop bandwidth and suppresses high-frequency noise that could destabilize the drive-sense synchronization.

How does the self-test function verify sensor integrity?

The self-test applies an electrostatic force to the MEMS mass via the ST pin, inducing a known Coriolis-like displacement. This produces a predictable 100 mV DC-level shift at OUTZ, independent of external rotation. If the measured shift falls within specification, both the mechanical structure and analog signal chain-including amplifier gain and offset-are confirmed functional.

Can LY3100ALH operate from a 3.3 V LDO without additional regulation?

Yes - the LY3100ALH is factory-calibrated at 3.0 V and fully specified from 2.7 V to 3.6 V. A well-decoupled 3.3 V LDO meets all supply requirements; ST recommends 1 µF and 10 nF capacitors near Vdd pins. No additional regulation is needed, and sensitivity/zero-rate values remain valid across this range without ratiometric scaling.

What is the significance of the "Res" pins (5 and 10)?

Pins 5 and 10 are reserved and have no internal connection. ST documentation explicitly states they must be left unconnected or tied to Vdd - floating is not permitted. These pins exist for mechanical symmetry and package compatibility; connecting them to Vdd improves thermal uniformity but adds no electrical function.