ICM-45686 | InvenSense (a TDK Group Company) | High-Performance 6-Axis MEMS Motion-Tracking IMU

Key Specifications

Sensor Combination: 3-axis accelerometer + 3-axis gyroscope (6-axis, **no magnetometer**)

Accelerometer Full-Scale Range (programmable): ±2g / ±4g / ±8g / ±16g / ±32g; up to 18-bit data output

Gyroscope Full-Scale Range (programmable): ±15.625 ~ ±4000 dps; up to 19-bit data output

Noise Performance: Gyroscope: 3.8 mdps/√Hz; Accelerometer: 70 µg/√Hz (Ultra-low noise among peer devices)

Communication Interfaces: I3CSM, I2C, SPI; with AUX auxiliary port (can act as I2C master or SPI slave for OIS optical image stabilization)

Supply Voltage: 1.71V ~ 3.6V

Shock Resistance: Up to **20,000g high shock tolerance**

Temperature Stability: Gyro drift ±0.005 º/s/℃ with excellent thermal drift control

FIFO Buffer: Max. 8KB for bulk sensor data storage

Power Consumption: Typical 0.42mA in low-noise mode; typical 0.22mA in low-power mode

Package: LGA, 2.5×3×0.81mm ultra-thin SMD

Temperature Range: **-40℃ ~ +85℃ (Industrial grade, non-automotive)**

## Main Features

1. Patented BalancedGyro™ architecture with outstanding vibration immunity. It suppresses measurement offset caused by vibration during drone and robot movement, ideal for flight controllers and motion control.

2. Built-in **APEX Motion Engine**, hardware-implemented motion detection algorithms: step counting, tilt detection, single/double tap, wrist wake-up, motion wake-up, free fall, high/low G detection to reduce MCU computing load.

3. AUX auxiliary port: supports connection to external sensors or OIS optical image stabilization controllers.

4. Large 8KB FIFO buffer for bulk sampling data storage, reducing frequent MCU reading and lowering system power consumption.

5. Two programmable hardware interrupts to wake up the MCU, suitable for low-power systems.

6. Integrated temperature sensor and programmable digital filter. Sampling bandwidth can be adjusted flexibly to suppress noise.

7. Supports external RTC clock input for improved attitude synchronization accuracy.

Applications

Drones & Robotics (Key Target Customers)

IMU for multi-rotor flight controller boards, attitude sampling under high-vibration environments, edge-side attitude calculation with STM32F4 / STM32H7

Motion attitude sensing and heading estimation for AGVs and small humanoid robots

 Wearable & Audio Devices

Motion recognition, step counting and attitude detection for TWS earbuds, smart bands and smartwatches

 Industrial Equipment

Vibration monitoring and attitude detection for portable acquisition instruments and sensor modules

High-precision motion capture equipment

 Remarks

1. Highlights: Low noise, excellent vibration resistance and ultra-high shock tolerance. Vibration immunity is highly valued for drone and robot projects. Compared with ICM-20948 (9-axis, NRND), this is a new-generation high-performance 6-axis IMU. An external magnetometer is required if heading measurement is needed.

2. Limitation: No built-in magnetometer. It is a pure 6-axis device and cannot output heading angle directly. External magnetic sensor is required for heading.

3. Recommended matching MCUs: STM32F405RGT6, STM32H743VIH6, connected via high-speed SPI.