The MMA9555L intelligent motion-sensing pedometer is an extension of the MMA955xL intelligent sensor platform. This device incorporates a 3-axis MEMS accelerometer， signal conditioning， data conversion， and a 32-bit microcontroller. This intelligent motion-sensing sensor provides sophisticated pedometer functionality， activity level and six directional orientation monitoring. The integrated functionality of sensor initialization， calibration， data compensation， and computation functions off-loads CPU bandwidth from the system application processor. Therefore， total system power consumption is significantly reduced， because the application processor stays powered down until absolutely needed. In addition， the device can be configured for an autosleep/autowake capability. MMA9555L is available in a plastic LGA package; the device is guaranteed to operate over the extended temperature range of –40 °C to +85 °C.