code: def openOnlyAccel(self, cycleFreq = 0x00 ):
          
          self.openWith(accel = True, gyro = False, temp = False, cycle = True, cycleFreq = cycleFreq)
docs: !
          Trun on device into Accelerometer Only Low Power Mode
          @param cycleFreq can be choise: 
              @see VAL_PWR_MGMT_2_LP_WAKE_CTRL_1_25HZ is default
              @see VAL_PWR_MGMT_2_LP_WAKE_CTRL_5HZ
              @see VAL_PWR_MGMT_2_LP_WAKE_CTRL_20HZ
              @see VAL_PWR_MGMT_2_LP_WAKE_CTRL_40HZ