去查看3482芯片就清楚了;http://wenku.baidu.com/link?url=-o75813N7HZg7dggDTj5YLR0MBBchCoT081A1APScHOBj11uoXdc-0JWG5fO4rtLY9hSH6sneUYaQF-VpJTgzQHUgB2JcAAwMBR_H6bGoYy