MPU-9255

Last crawled date: 1 year, 11 months ago

MPU-9255

9 axis IMU
3-axis gyroscope,
3-axis accelerometer,
3-axis magnetometer

It's a much better and improved version of the IMU MPU-6050.

InvenSense did a great job with this.
Wish it came with the AsahiKasei AK09940 magnetometer. Its range is less than the AK8963C but its sensitivity is greater.
Sensitivity: 10 nT/LSB (typ.)

https://bit.ly/2WieHTz

Some useful libraries to use this:
https://github.com/RTIMULib/RTIMULib-Arduino
https://github.com/Bill2462/MPU9255-Arduino-Library
https://kingtidesailing.blogspot.com/2015/09/how-to-setup-mpu-9150-9-axis.html

This is info from the data sheet:
"MPU-9255 is a multi-chip module (MCM) consisting of two dies integrated into a single QFN package. One
die houses the 3-Axis gyroscope and the 3-Axis accelerometer. The other die houses the AK8963 3-Axis
magnetometer from Asahi Kasei Microdevices Corporation. Hence, the MPU-9255 is a 9-axis
MotionTracking device that combines a 3-axis gyroscope, 3-axis accelerometer, 3-axis magnetometer and a
Digital Motion Processor™ (DMP) all in a small 3x3x1mm package available as a pin-compatible upgrade
from the MPU-6515. With its dedicated I2C sensor bus, the MPU-9255 directly provides complete 9-axis
MotionFusion™ output. The MPU-9255 MotionTracking device, with its 9-axis integration, on-chip
MotionFusion™, and run-time calibration firmware, enables manufacturers to eliminate the costly and
complex selection, qualification, and system level integration of discrete devices, guaranteeing optimal
motion performance for consumers. MPU-9255 is also designed to interface with multiple non-inertial digital
sensors, such as pressure sensors, on its auxiliary I2C port.
MPU-9255 features three 16-bit analog-to-digital converters (ADCs) for digitizing the gyroscope outputs,
three 16-bit ADCs for digitizing the accelerometer outputs, and three 16-bit ADCs for digitizing the
magnetometer outputs. For precision tracking of both fast and slow motions, the parts feature a userprogrammable
gyroscope full-scale range of ±250, ±500, ±1000, and ±2000°/sec (dps), a user programmable
accelerometer full-scale range of ±2g, ±4g, ±8g, and ±16g, and a magnetometer full-scale
range of ±4800μT.
Other industry-leading features include programmable digital filters, a precision clock with 1% drift from -
40°C to 85°C, an embedded temperature sensor, and programmable interrupts. The device features I2C and
SPI serial interfaces, a VDD operating range of 2.4V to 3.6V, and a separate digital IO supply, VDDIO from
1.71V to VDD.
Communication with all registers of the device is performed using either I2C at 400kHz or SPI at 1MHz. For
applications requiring faster communications, the sensor and interrupt registers may be read using SPI at
20MHz.
The MPU-9255 includes support for Automatic Activity Recognition (AARTM) on a wrist-worn device. It works
in conjunction with the AAR™ library to detect walk, run, bike, stationary, and sleep. The AAR™ library
achieves high detection accuracy and low power by using the gyro sensor in a smart duty cycle fashion. It is
capable of identifying a new activity within 10sec of its transition. The AAR™ library offers a high accuracy
pedometer that benefits from the contextual awareness of knowing which activities will require steps and
which will not.
By leveraging its patented and volume-proven CMOS-MEMS fabrication platform, which integrates MEMS
wafers with companion CMOS electronics through wafer-level bonding, InvenSense has driven the package
size down to a footprint and thickness of 3x3x1mm, to provide a very small yet high performance low cost
package. The device provides high robustness by supporting 10,000g shock reliability."