BMI323 6-Axis Inertial Measurement Unit (IMU) Bosch BMI323 6-Axis Inertial Measurement Unit (IMU) combines precise acceleration and angular rate (gyroscopic) measurement with intelligent on-chip motion-triggered interrupt features. The 6-axis IMU comprises a 16-bit triaxial gyroscope, a 16-bit triaxial accelerometer, and a 16-bit digital temperature sensor in a single chip.