code: def setDataRdyInt(self, int_cfg = 0x20 ):
          
          self._sendCmd( self.REG_INT_PIN_CFG, int_cfg )
          self._sendCmd( self.REG_INT_ENABLE, self.VAL_INT_ENABLE_DATA_RDY)
docs: !
          \~english 
          Set to enabled Data Ready Interrupt
          int_cfg : Register 55( 0x37 ) – INT Pin / Bypass Enable Configuration, page 26
          
          \~chinese 
          启用数据就绪中断
          @param int_cfg: 寄存器 55( 0x37 ) – INT Pin / Bypass Enable Configuration, page 26