STMicroelectronics LSM6DSV16BTR

Overview

LSM6DSV16BTR from STMicroelectronics is a 6-axis inertial measurement unit (IMU) integrating a 3-axis digital accelerometer and 3-axis digital gyroscope in a single LGA-14 package (2.5 × 3.0 × 0.71 mm), featuring dual-channel processing for motion tracking (UI, head tracking, gaming) and bone-conduction audio acceleration (TDM interface at 8/16 kHz), with ±16 g / ±4000 dps full scale, 0.95 mA combo high-performance mode current, and embedded sensor fusion low-power (SFLP) algorithm.

For engineers reviewing the LSM6DSV16BTR datasheet, LSM6DSV16BTR pinout, LSM6DSV16BTR application, or LSM6DSV16BTR equivalent, key selection considerations include TDM slave support for hearables, dual-channel independent ODR/FS configuration, hardware finite state machine (FSM) for gesture offloading, adaptive self-configuration (ASC), and 4.5 KB smart FIFO with timestamping and compression.

Technical Context

The LSM6DSV16BTR implements two physically and functionally separated signal paths: Channel 1 processes standard motion data (accelerometer + gyroscope) via I²C/SPI/MIPI I3C® with independent ODRs up to 7.68 kHz and configurable full scales; Channel 2 handles audio-grade acceleration (≥1 kHz bandwidth, 20 µg/√Hz noise) exclusively through the TDM interface at fixed 8 kHz or 16 kHz sample rates, enabling simultaneous bone conduction and motion sensing without cross-interference.

Its embedded processing blocks-eight independent finite state machines (FSM), pedometer/tilt/significant motion detectors, and sensor fusion low-power (SFLP) engine-execute in dedicated ultralow-power domains, with ASC enabling real-time register reconfiguration triggered by FSM output, and SFLP delivering game rotation vector (0.5° static yaw accuracy) using only on-chip accelerometer and gyroscope data.

Key Specifications

Pinout & Package

LSM6DSV16BTR uses a 14-pin land grid array (LGA) package measuring 2.5 mm × 3.0 mm × 0.71 mm, optimized for space-constrained TWS earbuds and wearables. Pin functions support dual operational modes: Mode 1 enables I²C/SPI/I3C® communication only; Mode 2 adds TDM interface (TDMout, BCLK, WCLK) alongside primary serial interface.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 6-axis IMU applications.

Compared with LSM6DSRTR and BMI088, the LSM6DSV16BTR uniquely integrates TDM audio acceleration, ASC-driven dynamic reconfiguration, and SFLP-based orientation estimation in a single 2.5 × 3.0 mm package - making it the only solution capable of concurrent high-fidelity bone conduction and low-latency head tracking in ultra-compact hearables.

Availability

LSM6DSV16BTR is available at Aetrix Electronics and suitable for true wireless stereo (TWS) earbuds, AR/VR head-mounted displays, and smart fitness wearables requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LSM6DSV16BTR 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 automotive chips with vertical fabrication capabilities and broad industrial certification coverage.

The LSM6DSV16BTR belongs to ST's "iNEMO" family of intelligent inertial modules, engineered specifically for hearable and wearable systems requiring simultaneous motion awareness and audio-grade vibration sensing in sub-3 mm footprints.

FAQ

What interfaces does the LSM6DSV16BTR support, and how are they configured?

The LSM6DSV16BTR supports I²C, SPI (3- and 4-wire), MIPI I3C®, and TDM interfaces. Configuration is determined by the CS pin state and internal register settings: CS = high enables I²C/I3C®/SPI idle mode; CS = low selects SPI active mode. TDM pins (TDMout, BCLK, WCLK) are active only in Mode 2, where they operate concurrently with the primary serial interface - no software arbitration is required.

How does the dual-channel architecture improve performance in TWS applications?

The dual-channel architecture isolates bone conduction acceleration (Channel 2, TDM-only) from motion tracking data (Channel 1, I²C/SPI), eliminating software time-slicing and ensuring deterministic latency for both functions. This allows simultaneous 16 kHz vibration sampling for speech enhancement and 7.68 kHz gyroscope updates for head tracking - critical for real-time spatial audio rendering without jitter or dropouts.

What is the role of the embedded finite state machine (FSM), and what is its maximum update rate?

The embedded FSM executes user-defined motion pattern recognition (e.g., glance gestures, wrist tilt) directly on the sensor die at up to 960 Hz, using raw accelerometer and gyroscope data as inputs. Each of the eight independent FSMs has dedicated memory and can trigger interrupts upon reaching an end state - enabling consistent, low-power gesture detection without host CPU involvement or firmware overhead.

Does the LSM6DSV16BTR include temperature compensation, and how is it implemented?

Yes - the LSM6DSV16BTR integrates a calibrated on-die temperature sensor with 16-bit ADC resolution, 60 Hz refresh rate, and ±15°C offset tolerance. Temperature data is used internally for automatic sensitivity and offset compensation of both accelerometer and gyroscope outputs, and is also accessible via register read for host-side thermal drift correction in precision motion applications.