ICM-45686 (TDK InvenSense) 6-axis IMU motion sensor

One-sentence overview: A high-performance 6-axis MEMS motion sensor featuring BalancedGyro™ technology, integrating a 3-axis gyroscope and 3-axis accelerometer. It comes with the built-in APEX motion engine and dual-path architecture, delivering high precision and ultra-low power consumption in a compact LGA-14 package by TDK InvenSense.

 Key Specifications

1. Package: LGA-14, dimension 2.5 × 3 × 0.81 mm

2. Measurement Range

   - Gyroscope: ±15.625 ~ ±4000 dps (programmable)

   - Accelerometer: ±2g ~ ±32g (programmable)

3. Noise

   - Gyroscope noise: 3.8 mdps/√Hz

   - Accelerometer noise: 70 μg/√Hz

4. Power Consumption

   - Low-noise mode: 0.42mA for 6-axis operation

   - Low-power mode: 0.22mA for 6-axis operation

5. Temperature Drift

   - Gyroscope: ±0.005 °/s/℃

   - Accelerometer: ±0.15 mg/℃

6. Power Supply: VDD: 1.71~3.6V; VDDIO: 1.08~3.6V

7. Communication Interface: I2C / I3C / SPI; **Dual independent paths UI+AUX**. The AUX path can connect to OIS optical image stabilization or external sensors.

8. FIFO: Up to 8KB, reduces MCU read frequency and saves power.

9. Operating Temperature Range: -40℃ ~ +85℃

10. ADC: On-chip 16-bit ADC with integrated temperature sensor.

## Features

1. Basic Measurements: 3-axis angular velocity, 3-axis acceleration, and on-chip temperature sensing.

2. APEX On-Chip Motion Algorithms (no MCU computation required)

   - Pedometer, tilt detection, single / double tap gesture

   - Wake-on-wrist, Wake-on-Motion (WoM), free-fall detection

   - Significant motion detection, low-G / high-G event trigger

3. Dual independent data paths: UI user motion path + AUX auxiliary path (for OIS optical image stabilization). The two paths support independent configuration of range and output data rate.

4. Programmable digital filters, programmable interrupt output, external clock input.

5. FIFO bulk data output reduces host MCU load and extends battery life.

 Applications

TWS earbuds, smart watches / bands, smart rings (wearable & hearable devices)

AR/VR glasses, AI smart glasses (head pose tracking)

Drone flight controllers (attitude sensing; high range suitable for aggressive maneuvers)

Game controllers

High-precision robots

Portable IoT and battery-powered devices

 Selling Points

Excellent vibration immunity and low temperature drift. Dual-path interface supports OIS. Built-in motion event detection greatly reduces host computing load. Selectable low/high power modes make it ideal for compact battery-powered devices. The ultra-wide gyroscope range up to ±4000 dps is its standout advantage over conventional consumer-grade IMUs.