Gyroscope

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This is present in the iPhone 4 and the iPod touch 4G. It detects movements far more precise than the accelerometer, and creates 6-axis motion sensing combined with the Compass (iPhone-only) and the accelerometer.

the chip an both the iPhone 4 and the iPod touch 4G is a STMicroelectronics AGD1 2022 FP6AQ The V654A ASIC die converts the tiny capacitive signals from the GK10A MEMS die into a digital signal [1]