LPC18A1

From The Apple Wiki
M7

Motion coprocessor marketed by Apple as M7 and codenamed "Oscar" which is built into the iPhone 5s, iPad mini 2 and iPad Air. It is used by apps that access motion data while the device is sleeping (such as Nike+ Move [Archived 2013-11-06 at the Wayback Machine]), allowing the main CPU to go to sleep and therefore conserve battery life.