STMicroelectronics ISM330ISTR

Overview

ISM330ISTR from STMicroelectronics is a 6-axis inertial measurement unit (IMU) system-in-package integrating a 3-axis digital accelerometer (±2/±4/±8/±16 g FS) and 3-axis digital gyroscope (±125–±2000 dps FS), plus an embedded Intelligent Sensor Processing Unit (ISPU) for on-sensor AI inference. It operates at 0.59 mA in high-performance mode and supports sensor hub functionality for up to four external sensors, targeting industrial robotics, asset tracking, and anomaly detection systems.

For engineers reviewing the ISM330ISTR datasheet, ISM330ISTR pinout, ISM330ISTR application, or ISM330ISTR equivalent, key selection criteria include ISPU programmability via NanoEdge AI Studio, dual-mode SPI/I²C interface flexibility, low-noise performance (70 µg/√Hz accel, 3.4 mdps/√Hz gyro), and LGA-14L package compatibility with space-constrained IoT edge nodes.

Technical Context

The ISM330ISTR implements a dual-core architecture: a sensor core (8-bit register interface) managing accelerometer/gyroscope configuration and data output, and a 32-bit ISPU core (STRED architecture) with 32 KB program RAM and 8 KB data RAM executing C-coded signal processing and ML inference directly on sensor data. The ISPU accesses raw sensor data via dedicated 16-bit two's complement registers (e.g., ISPU_ARAW_X_L at 6880h).

It supports two hardware configuration modes: Mode 1 enables standard SPI/I²C communication, while Mode 2 adds master I²C capability for external sensor interfacing. Programmable interrupts (INT1/INT2) and sensor hub logic allow autonomous event-driven wake-up of host MCUs, enabling ultra-low-power always-on motion intelligence.

Key Specifications

Pinout & Package

LGA-14L package (2.5 mm × 3.0 mm × 0.83 mm), RoHS-compliant, land grid array with exposed pad for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LSM6DSRXTR and ICM-42688-P, the ISM330ISTR uniquely delivers C-programmable ISPU with NanoEdge AI Studio support, enabling rapid deployment of custom edge ML models while maintaining lowest active current (0.59 mA) and smallest footprint (2.5 × 3.0 mm).

Availability

ISM330ISTR is available at Aetrix Electronics and suitable for industrial robot joint monitoring, asset tracking in logistics, and anomaly detection in smart factories requiring stable component supply across multi-year production cycles.

Supply support for ISM330ISTR 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, specializing in MEMS sensors, microcontrollers, and power management ICs for industrial, automotive, and consumer markets.

The ISM330ISTR belongs to ST's ISPU-enabled IMU product line, designed specifically to shift AI inference from cloud/host processors to the sensor node-enabling ultra-low-power, real-time motion intelligence for Industry 5.0 and next-generation wearables.

FAQ

What is the functional difference between ISM330ISTR and ISM330ISNTR?

The ISM330ISNTR variant includes a dedicated ISPU configuration certified to execute machine learning libraries generated by ST's NanoEdge AI Studio, whereas the ISM330ISTR supports general-purpose C programming on the ISPU but does not guarantee NanoEdge AI Studio compatibility. Both share identical mechanical, electrical, and pinout specifications; the distinction lies solely in firmware-enforced ISPU capabilities and factory provisioning.

Can the ISM330ISTR operate without an external microcontroller?

No-the ISM330ISTR requires an external host MCU to initialize the ISPU (load program into volatile RAM at power-up via SPI/I²C), configure sensor parameters, and read processed outputs. It lacks boot ROM or non-volatile program storage; all ISPU code must be loaded externally, making it a sensor co-processor rather than a standalone controller.

How does the sensor hub manage timing synchronization across internal and external sensors?

The sensor hub uses the ISM330ISTR's internal clock to timestamp data from internal accelerometers/gyroscopes and external I²C sensors. When operating in master I²C mode (Mode 2), it initiates reads from external sensors at programmable intervals aligned with internal ODR settings, ensuring phase-coherent multi-sensor sampling without host intervention.

What is the maximum sustained output data rate supported by the ISM330ISTR?

The ISM330ISTR supports up to 6667 Hz for both accelerometer and gyroscope simultaneously-achievable only in high-performance mode with corresponding current draw (0.59 mA). At this rate, raw 16-bit data from all six axes generates ~267 kbps, requiring SPI interface at ≥10 MHz or I²C fast-mode-plus (1 MHz) with efficient burst reads to avoid FIFO overflow.