STMicroelectronics LSM6DSMTR

Overview

LSM6DSMTR from STMicroelectronics is a fully integrated iNEMO inertial module combining a 3D digital accelerometer and 3D digital gyroscope in a single LGA-14L package. It delivers ±2/±4/±8/±16 g acceleration sensing and ±125/±250/±500/±1000/±2000 dps angular rate measurement with 0.65 mA high-performance mode current draw, enabling always-on motion tracking for smartphone sensor hubs and OIS-critical camera modules.

For engineers reviewing the LSM6DSMTR datasheet, LSM6DSMTR pinout, LSM6DSMTR application, or LSM6DSMTR equivalent, this page provides verified technical context on its dual-interface (I²C/SPI + auxiliary SPI), embedded pedometer/tilt/significant-motion functions, FIFO-based batching up to 4 kbyte, and dedicated OIS signal path-key selection criteria for Android M–compliant wearable and mobile designs.

Technical Context

The LSM6DSMTR implements independent power domains for accelerometer and gyroscope, supporting combo normal mode (0.4 mA) and combo high-performance mode (0.65 mA) with configurable full-scale ranges and programmable low-pass filters. Its architecture includes two serial interfaces: primary I²C/SPI for host processor communication and auxiliary SPI dedicated to real-time OIS data streaming from both sensors.

Embedded functionality is managed via banked register sets-including Sensor Hub registers (2Eh–52h), motion detection engines (53h–5Fh), and OIS control registers (6Fh–72h)-enabling hardware-accelerated pedometer, step counter, tilt detection, and 6D orientation without host CPU intervention.

Key Specifications

Pinout & Package

LSM6DSMTR is housed in a 14-terminal plastic land grid array (LGA) package measuring 2.5 × 3.0 × 0.83 mm, optimized for space-constrained mobile and wearable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar inertial module applications.

Compared with LSM6DSMTR, LSM6DSOXTR adds ML-based motion classification and tighter OIS timing, while ICM-42688-P reduces interface complexity at the expense of OIS readiness-making LSM6DSMTR the optimal balance of Android compliance, dual-interface flexibility, and production-proven OIS support.

Availability

LSM6DSMTR is available at Aetrix Electronics and suitable for smartphone sensor hubs, camera OIS modules, wearable fitness trackers, and industrial vibration monitors requiring stable component supply across multi-year production cycles.

Supply support for LSM6DSMTR 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 specializing in MEMS, microcontrollers, and power management ICs, with manufacturing facilities certified to ISO 9001 and IATF 16949 standards.

The LSM6DSMTR belongs to ST's iNEMO inertial module family, engineered specifically for Android-compliant mobile and wearable platforms requiring integrated motion sensing, low-power always-on operation, and hardware-accelerated sensor fusion.

FAQ

What is the difference between the primary and auxiliary SPI interfaces on the LSM6DSMTR?

The primary SPI interface (CS, SPC, SDI, SDO) handles configuration, register reads/writes, and main sensor data retrieval. The auxiliary SPI (AUX_CS, SPC, SDI, SDO) is a dedicated, low-latency path exclusively for streaming time-synchronized gyroscope and accelerometer data to camera ISPs-bypassing host CPU involvement and reducing OIS loop delay to <100 µs.

Does the LSM6DSMTR support hardware pedometer functionality without host processor intervention?

Yes-the LSM6DSMTR embeds a dedicated pedometer engine that operates autonomously using internal accelerometer data. It generates step count updates and interrupts (via INT2) without host CPU polling, maintaining accuracy >95% across walking speeds 0.5–2.5 m/s while consuming only 0.4 mA in combo normal mode.

Can the LSM6DSMTR be used for electronic image stabilization (EIS) in addition to optical image stabilization (OIS)?

Yes-its 4 kbyte FIFO, timestamped sensor outputs, and dual-interface architecture support both EIS and OIS. For EIS, the host processor uses primary interface data with precise timestamps to warp video frames; for OIS, auxiliary SPI delivers real-time gyro/accel data directly to the actuator driver-enabling hybrid stabilization with minimal latency.

What is the purpose of the hard/soft iron calibration registers in the LSM6DSMTR?

These registers (MAG_SI_XX through MAG_SI_ZZ and MAG_OFFX_L/H etc.) store correction coefficients applied to external magnetometer data when the LSM6DSMTR is used in a sensor hub configuration. They compensate for magnetic field distortion caused by nearby ferrous materials (hard iron) and induced fields (soft iron), improving compass heading accuracy by up to 15° in handheld device enclosures.