def begin(self):
		"""Start taking temperature measurements. Returns True if the device is 
		intialized, False otherwise.
		"""
		# Check manufacturer and device ID match expected values.
		mid = self._device.readU16BE(MCP9808_REG_MANUF_ID)
		did = self._device.readU16BE(MCP9808_REG_DEVICE_ID)
		self._logger.debug('Read manufacturer ID: {0:04X}'.format(mid))
		self._logger.debug('Read device ID: {0:04X}'.format(did))
		return mid == 0x0054 and did == 0x0400
Start taking temperature measurements. Returns True if the device is 
		intialized, False otherwise.