Inside the MMA8451Q accelerometer chip

摘要

The Freescale Semiconductor MMA8451Q is a 14-bit 3-axis accelerometer with a built-in DSP (digital signal processor) and a plethora of embedded functions. The acceleration transducers are MEMS (micro electromechanical systems) technology, which combines on-chip nano-scale mechanical parts with electronic components.rnIn this case, each transducer is a microscopic sprung mass, which forms the moving plate of a capacitor. As the mass moves against the spring, under the influence of acceleration, the capacitance changes.