I found this in one of my rss feeds:
The MPU-9150™ is the world’s first 9-axis motion tracking device designed for the low power, low cost, and high performance requirements of consumer electronics equipment including smartphones, tablets and wearable sensors.
The MPU-9150™ is actually two chips in one package: the MPU-6050 ( 3-axis gyro / 3-axis accelerometer ), and an AK8975 ( 3-axis digital compass ). They’ve also included what they call a Digital Motion Processor™ (DMP™) which is used to precisely process and ship sensor data over I2C.
It’s pretty small- 4x4x1mm with a 2.4 to 3.34V operating range. So… probably not something you can hook-up directly to a microcontroller. [Via]

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9150 has only I2C interface, while 6000 has both I2C and SPI. As far as I know, the footprint for 9xxx is the same as for 6xxx, so you can just swap the chips without hardware changes. Unfortunately, in APM it's connected via SPI.
The bad thing: 9150 has only I2C support. A MPU9100 with SPI support seems not to be planned.
(That's a pitty, because it's pin compatible to the MPU6000, so.. easy to upgrade)
The 3.3 V are no problem, t's the same voltage the MPU6000 on the APM2 is using.
Additionally at first the AKA8975 has to show if it can beat the HMC5883L :)
right
This is probabilly for APM3...
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