MMA7455 is a very low power 3 axis digital accelerometer from Freescale Semiconductors. It’s micro machined nano structure is capable of measuring acceleration along its X, Y and Z axes. This chip has built in analog amplifiers, Analog to Digital Conversion circuit and an SPI/I2C capable bus interface. MMA7455 supports three sensitivity ranges, ±2g, ±4g, ±8g. MMA7455 can be configured to detect and measure motion pulses, taps and free fall along any of its axes. Two interrupt pins INT1 and INT2 can be configured to interrupt the CPU when any of these events occur.