Apple has chosen to equip the iPhone 6 and 6 Plus with two separate accelerometers, as discovered in the Chipworks comprehensive teardown. The resulting report shows that there is a Bosch BMA280 three-axis accelerometer and what is believed to be an InvenSense MPU 6700 six-axis accelerometer.
Apple could have decided to incorporate two accelerometers in the iPhone 6 and 6 Plus both for minimize energy consumption as if to improve the experience general user.
The device Inven Sense can function as a six axis inertial sensor, that is, as a three-axis gyroscope or a three-axis accelerometer. It is rated to draw 3,4 mA in six-axis mode, 3,2 mA in gyro mode, and 450 μA in normal accelerometer mode.
In addition the InvenSense provides significantly increased sensitivity than the Bosch device. The consideration is the higher energy consumption. The main benefit of the InvenSense is full integration of the data from the six axes by the digital motion processor, which will provide a direct benefit in games and other applications that need sophisticated inertia sensing capabilities.
The device Bosch operates as a 3-axis accelerometer and that consumes 130 μA of current. Both devices offer two low power levels in the accelerometer function.
The Bosch accelerometer is capable of lower power than the InvenSense and is «Too much faster»For your acold start, allowing it to be used when six-axis integration is unnecessary.
