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Accelerometer
This chip helps detect movement in the iPad, iPhone, and iPod touch. Newer devices also include a gyroscope, which allows 6-axis movement detection. this chip is a STmicroelectronics lis331DL [1]
The Accelerometer has 2 sensitivity settings Single click and Double click.
Single click is used by the ipad's springboard to detect rotational movement.
Double click is used by most games.