The guys at iFixit have already taken them apart and this is helping us to learn all the secrets of the guts of these two new iPhones. This week we have discovered that they mount two independent accelerometers .
The accelerometers are a three-axis Bosch while the InvenSense accelerometer is capable of acting on 6 axes . The reason for including two accelerometers seems quite simple, to save consumption. The difference in consumption between the two models is remarkable.
The game that both accelerometers can give is very interesting. The InvenSense model has a clearly higher sensitivity than the Bosch (16684 LSBg compared to 4096 for the German model). The Invensense accelerometer is capable of operating on 6 and 3 axes, as required, and as could be expected operating on 3 axes, its consumption is lower.
The numbers are clear, 3.4 milliamps on 6 axes and 450 microamps on 3 axes , but the accelerometer of Bosch lowers the consumption to 130 microamps . The objective seems clear, Apple wants to give access to the “superior” accelerometer when more capacity is needed (games) while in the day to day life the Bosch model will be used, helping to a lower consumption (and a faster response being less time needed for its start up).